CN108306678B

CN108306678B - Single photon source single photon output system

Info

Publication number: CN108306678B
Application number: CN201711464014.9A
Authority: CN
Inventors: 苗浡瑞; 苗新
Original assignee: State Grid Corp of China SGCC; Economic and Technological Research Institute of State Grid Beijing Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Economic and Technological Research Institute of State Grid Beijing Electric Power Co Ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2020-10-13
Anticipated expiration: 2037-12-28
Also published as: CN108306678A

Abstract

The invention relates to a single photon source single photon output system and a control method, wherein the system comprises a serial/parallel conversion unit, a single photon source unit group, an Nx 1 photoswitch and a controller which is connected with the serial/parallel conversion unit, the single photon source unit group and the Nx 1 photoswitch in a bidirectional way, wherein the serial/parallel conversion unit, the single photon source unit group and the Nx 1 photoswitch are connected in sequence; the technical scheme of the invention is that a serial/parallel conversion unit converts an input end high-speed serial electric pulse signal into N paths of parallel electric pulse signals with low speed, N single photon source units with the same performance respectively convert the N paths of parallel electric pulse signals into N parallel optical signals, and then the N paths of parallel optical signals pass through an Nx 1 optical switch to realize parallel/serial conversion of the optical signals and output high-speed single photon signals, so that the problem of limitation of single photon rate generation of a single photon source device is solved, the minimum interval time between single photons is shortened, the single photon output rate is improved, and the problem of limitation of technology and economy of the high-speed single photon source device is solved.

Description

Single photon source single photon output system

Technical Field

The invention relates to the field of quantum physics application, in particular to the field of quantum information technology engineering application, and specifically relates to a single photon source single photon output system and a control method.

Background

The single photon source technology has irreplaceable effects in the fields of quantum information technology, physics, chemistry, biology, astronomy and the like; especially in the field of quantum information, such as quantum communication, quantum computation, quantum measurement, the single photon source technology has become one of the indispensable core key technologies for the development of the field; because the quantum information technology utilizes single basic particles such as photons to encode and control information, extremely strict performance requirements are provided for a single photon source, such as single photon output rate, maximum output frequency of single photon pulses, minimum interval time between single photons and the like, which far exceed the performance indexes which can be realized by the existing devices; to meet these increasing application requirements, researchers in the field are constantly improving conventional single photon sources; the single photon source device has the functions of completing the conversion from an electric signal to an optical signal, and generating a single photon pulse stream by taking the received electric signal pulse stream as a trigger signal; the output single photon pulse flow rate of the single photon source device is limited by various factors such as generation efficiency and the like; the single photon source with high output rate is not only high in price but also limited by foreign high-technology blockade, and aims to solve the problem of limiting the rate of single photon generated by a single photon source device.

Therefore, it is desirable to provide a single photon source single photon output system and a control method thereof, which can effectively increase the single photon output rate.

Disclosure of Invention

The invention provides a single photon source single photon output system and a control method, and aims to adopt N single photon source units with the same performance to work in parallel to convert an electric signal into N parallel optical signals, realize the parallel-serial conversion of the optical signals by utilizing an Nx 1 optical switch, and effectively improve the single photon output rate of a single photon source on the premise of not reducing the efficiency of each single photon source.

The purpose of the invention is realized by adopting the following technical scheme:

in a single photon source single photon output system, the improvement comprising: the device comprises a serial/parallel conversion unit (1), a single photon source unit group (2), an Nx 1 photoswitch (3) and a controller (4);

the serial/parallel conversion unit (1), the single photon source unit group (2) and the Nx 1 photoswitch (3) are connected in sequence;

the controller (4) is respectively connected with the serial/parallel conversion unit (1), the single photon source unit group (2) and the Nx 1 photoswitch (3) in a bidirectional mode;

the serial/parallel conversion unit (1) is connected with the single photon source unit group (2) through N same-type cables with the same performance and the same length, and the single photon source unit group (2) is connected with the Nx 1 photoswitch (3) through N same-type optical fibers with the same performance and the same length.

Preferably, the serial/parallel conversion unit (1) is configured to convert the input end 1-way high-speed serial electrical signal into N-way parallel electrical signals with a low code rate;

the serial/parallel conversion unit (1) comprises a 1 xN electric switch or a first-in first-out serial/parallel conversion unit;

the 1 xn electrical switch is a rotary Micro-Electro-mechanical system (MEMS) 1 xn electrical switch.

Preferably, the single photon source unit group (2) is used for converting N paths of parallel electric signals into N paths of parallel optical signals through N single photon source units with the same performance;

the single photon source unit group (2) is formed by arranging N single photon source units with the same performance in parallel, wherein N is a positive integer;

the single photon source unit is an independent single photon source or a single photon source array device;

the single photon source comprises a parametric down-conversion single photon source, a quantum dot single photon source and a nano antenna single photon source;

the single photon source array comprises a parametric down-conversion single photon source array device, a quantum dot single photon source array device and a nano antenna single photon source array device;

the single photon source array device is formed by arranging the same single photon source units in parallel and packaged together.

Preferably, the N × 1 optical switch (3) is configured to convert N parallel optical signals into 1 serial optical signal, and output the optical signal at an output end;

the N x 1 optical switch (3) comprises a Mechanical optical switch, a waveguide optical switch and a Micro-Electro-Mechanical System (MEMS) optical switch.

Preferably, the controller (4) is used for controlling the working frequency synchronization, the working time synchronization and the working state synchronization of the serial/parallel conversion unit (1), the single photon source unit group (2) and the Nx 1 photoswitch (3); the controller (4) provides clock signals and control signals for the serial/parallel conversion unit (1), the single photon source unit group (2) and the Nx 1 optical switch (3), and monitors alarm information of the serial/parallel conversion unit;

the controller (4) comprises a built-in clock and an external interface;

the clock source of the built-in clock comprises a constant temperature crystal oscillator, a rubidium atomic clock and a cesium atomic clock;

the external interface comprises an IRIG-B DC code clock signal interface, a trigger pulse input/output interface, an RS232 management interface and a USB interface;

the controller (4) extracts frequency and phase synchronization information from the input electrical signal entering the input of the serial/parallel conversion unit (1).

In a method of controlling a single photon source single photon output system as in any of the above, the improvement comprising:

inputting 1-path high-speed serial electric signal, and converting the input 1-path high-speed serial electric signal into N-path parallel electric signals with low code rate by a serial/parallel conversion unit (1);

the single photon source unit group (2) respectively converts N paths of parallel electric signals into N paths of parallel optical signals through the parallel work of N single photon source units with the same performance;

n paths of parallel optical signals are converted into 1 path of serial optical signals by an Nx1 optical switch (3), and the optical signals are output at an output end;

the input end of the single photon source unit x is connected with the x-th path of electric signals at the output end of the serial/parallel conversion unit (1) through a cable, the output end of the single photon source unit x is connected with the x-th path of optical signals at the input end of the Nx 1 optical switch (3) through an optical fiber, and x is more than or equal to 1 and less than or equal to N.

Preferably, the serial/parallel conversion unit (1) converts an input 1-channel high-speed serial electrical signal into an N-channel parallel electrical signal with a low code rate, and includes:

the serial/parallel conversion unit (1) is controlled by the controller (4) to complete serial/parallel conversion of input electric signals, 1 path of serial electric signals are converted into N paths of parallel electric signals, and N is a positive integer;

the serial/parallel conversion unit (1) is controlled by a controller (4) and periodically works in a polling mode with equal intervals of 1 to N, and each cycle corresponds to N serial electric pulses in the serial electric signals;

the serial/parallel conversion unit (1) is controlled by a controller (4), the conduction time of the serial/parallel conversion unit is a time interval of passing through 1 electric pulse, and each electric pulse passes through the serial/parallel conversion unit (1) at the middle point of the conduction time interval;

the x-th path of electric signals at the output end of the serial/parallel conversion unit (1) are related to the x-th path of optical signals at the input end of the Nx 1 optical switch (3), and in each working period, the input end and the output end of the single photon source unit x in the single photon source unit group (2) respectively correspond to the x-th path of electric signals at the output end of the serial/parallel conversion unit (1) and the x-th path of optical signals at the input end of the Nx 1 optical switch (3), wherein x is more than or equal to 1 and is less than or equal to N.

Preferably, the single photon source unit group (2) converts N paths of parallel electrical signals into N paths of parallel optical signals respectively through parallel work of N single photon source units with the same performance, and the conversion process includes:

the single photon source unit group (2) is controlled by the controller (4), so that the working frequency synchronization, the working time synchronization and the working state synchronization among the N single photon source units in the single photon source unit group (2) are ensured.

Preferably, the converting the N-path parallel optical signals into 1-path serial optical signals by using the N × 1 optical switch (3) includes:

the Nx 1 optical switch (3) is controlled by a controller (4), periodically works in a polling mode with equal intervals of 1 to N, and corresponds to N serial optical pulses in the serial optical signal per period;

the Nx 1 optical switch (3) is controlled by a controller (4), keeps the working time, the working frequency and the working state of the optical switch synchronous with the working time, the working frequency and the working state of the serial/parallel conversion unit (1), converts N paths of parallel input optical signals into 1 path of serial optical signals, and N is a positive integer;

the 1 st to Nth single photon source units in the single photon source unit group (2) output N paths of parallel optical signals in total, each path of the N paths of parallel optical signals corresponds to 1 optical pulse in each period, each optical pulse passes through an Nx 1 optical switch (3) at the left and right of the middle point of the conduction time interval of the optical switch, and the N paths of parallel optical signals are converted into 1 path of serial optical signals through the Nx 1 optical switch (3) to be output.

Preferably, the controller (4) controls the function execution of the serial/parallel conversion unit (1), the single photon source unit group (2) and the Nx 1 photoswitch (3);

the controller (4) provides clock signals and control signals for the serial/parallel conversion unit (1), the single photon source unit group (2) and the Nx 1 optical switch (3), and monitors alarm information of the serial/parallel conversion unit;

the controller (4) ensures that the serial/parallel conversion unit (1) periodically polls the work and the Nx 1 optical switch (3) periodically polls the work and is associated with each other, so as to realize a one-to-one correspondence relationship, the x-th path of electric signal at the output end of the serial/parallel conversion unit (1) is associated with the x-th path of optical signal at the input end of the Nx 1 optical switch (3), and in each working period, the input end and the output end of the single photon source unit x in the single photon source unit group (2) respectively correspond to the x-th path of electric signal at the output end of the serial/parallel conversion unit (1) and the x-th path of optical signal at the input end of the Nx 1 optical switch (3), wherein x is more than or equal to 1 and is;

the clock synchronization signal comprises a working frequency synchronization signal, a working phase synchronization signal and a working time synchronization signal, and the alarm information is fault alarm information.

Compared with the prior art, the invention also has the following beneficial effects:

1. the technical scheme adopted by the invention is that a serial/parallel conversion unit converts an input end high-speed serial electric pulse signal into N paths of parallel electric pulse signals with low code rate, N single photon source units with the same type and performance are respectively converted into N parallel optical signals, and the parallel/serial conversion of the optical signals is realized through an Nx 1 optical switch to output a high-speed single photon optical pulse signal; under the condition that the generation efficiency is not reduced, single photons with the speed N times of the optical pulse signal flow allowed by a single photon source device can be normally output, and the effect of improving the output code speed of a single photon source system is achieved.

2. The technical scheme adopted by the invention shortens the minimum interval time of single photons of the whole system by parallel working of N single photon sources with the same performance without reducing the efficiency of each single photon source, and ensures the single photon performance because the minimum interval time is not 0; and the system is integrated and innovative, and the system performance index is optimized.

3. The technical scheme adopted by the invention is that N single photon sources with the same performance work in parallel, the efficiency of each single photon source is not reduced, and the maximum output frequency of single photon pulses of the whole system is improved to be N times of that of a single photon source.

4. The technical scheme adopted by the invention replaces 1 high-speed expensive single photon source by N low-speed cheap single photon sources, solves the problem that the single photon source with high output rate is not only high in price but also limited by foreign high-technology blockade, and has excellent economical efficiency and practicability.

5. The technical scheme adopted by the invention improves the output rate of single photons of the whole system and the technical index of a single photon source by the parallel work of N single photon source devices with the same performance, provides an application scene for a multi-channel single photon source device and a single photon source array, further promotes the development of a photon integration technology from the application angle and popularizes the engineering application of a Photon Integrated Circuit (PIC).

6. According to the technical scheme adopted by the invention, N single photon source devices with the same performance work in parallel, so that the output rate of single photons of the whole system is increased, the technical index of a single photon source is improved, the technical level of quantum communication is improved, and the increasing requirements of quantum communication are further met. The three core technologies in quantum communication are a single photon source technology, a quantum coding and transmission technology and a single photon detection technology respectively.

7. The technical scheme adopted by the invention improves the output rate of single photons, improves the technical index of a single photon source, can promote and improve the speed and the precision of a quantum logic gate, and has positive promotion effect in the fields of quantum computing (quantum computing) and quantum computers (quantum computers).

8. The technical scheme adopted by the invention improves the output rate of single photons, improves the technical index of a single photon source, improves the technical level of a photon source system, realizes the solution of a high-speed single photon source system, and has wide application prospect in the fields of high-resolution spectral measurement, nondestructive substance analysis, high-speed phenomenon detection, precision analysis, atmospheric pollution measurement, bioluminescence, radioactivity detection, high-energy physics, astronomical photometry, laser ranging, laser radar and the like.

Drawings

FIG. 1 is a schematic diagram of the single photon source single photon output system of the present invention;

FIG. 2 is a timing diagram of electrical signals of a serial/parallel conversion unit of the single photon source single photon output system according to the embodiment of the invention;

FIG. 3 is a logic diagram of Nx 1 optical switch control of a single photon source single photon output system according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an Nx 1 optical switch operating mode of a single photon source single photon output system according to an embodiment of the present invention;

FIG. 5 is a timing diagram of Nx 1 optical switch signals of the single photon source single photon output system according to the embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a single photon source single photon output system with a quadruple single photon output rate in accordance with embodiment 1 of the present invention;

FIG. 7 is a schematic view of a 1X 4 electrical switch of a single photon source single photon output system with a quadruple single photon output rate according to example 1 of the present invention;

FIG. 8 is a schematic structural diagram of a single photon source single photon output system with sixteen times higher single photon output rate in example 2 of the present invention;

FIG. 9 is a schematic structural diagram of a single photon source single photon output system with a single photon output rate increased by sixty-four times in embodiment 3 of the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a single photon source single photon output system and a control method thereof, which are explained below.

From quantum mechanics theory, it is known that a single photon is the irreparable quantum limit of light, and the minimum unit of light energy is one photon, therefore, one limit of light source capability is to achieve controllable output of a single photon.

The output single photon pulse flow rate of the single photon source device is limited by various factors such as the generation efficiency and the like. The single photon source with high output rate is not only high in price but also limited by foreign high-technology blockade, and aims to solve the problem of limiting the rate of single photon generated by a single photon source device. The invention relates to a system and a method for improving single photon output rate by a single photon source, which comprises a serial/parallel conversion unit, a single photon source unit group, an Nx 1 optical switch and a controller which is connected with the serial/parallel conversion unit, the single photon source unit group, the Nx 1 optical switch and the controller in a bidirectional way. The minimum interval time between single photons is shortened, the single photon output rate is improved, and the problem of limitation of the technology and economy of a high-speed single photon source device is solved.

Fig. 1 shows a schematic structural diagram of a single photon source single photon output system of the invention, and as shown in fig. 1, the system may include:

the device comprises a serial/parallel conversion unit 1, a single photon source unit group 2, an Nx 1 photoswitch 3 and a controller 4;

the serial/parallel conversion unit 1, the single photon source unit group 2 and the Nx 1 photoswitch 3 are connected in sequence;

the controller 4 is respectively connected with the serial/parallel conversion unit 1, the single photon source unit group 2 and the Nx 1 photoswitch 3 in a bidirectional way;

the serial/parallel conversion unit 1 is connected with the single photon source unit group 2 through N cables of the same type with the same performance and the same length, and the single photon source unit group 2 is connected with the Nx 1 optical switch 3 through N optical fibers of the same type with the same performance and the same length.

The serial/parallel conversion unit 1 is used for converting the input end 1-path high-speed serial electric signal into N-path parallel electric signals with low code rate;

the serial/parallel conversion unit 1 may include a 1 xn electrical switch or a first-in-first-out serial/parallel conversion unit;

The single photon source unit group 2 is used for converting N paths of parallel electric signals into N paths of parallel optical signals through N single photon source units with the same performance;

the single photon source unit group 2 is formed by arranging N single photon source units with the same performance in parallel, wherein N is a positive integer;

the single photon source can comprise a parametric down-conversion single photon source, a quantum dot single photon source and a nano antenna single photon source;

the single photon source array can comprise a parametric down-conversion single photon source array device, a quantum dot single photon source array device and a nano antenna single photon source array device;

Specifically, the N × 1 optical switch 3 is configured to convert N paths of parallel optical signals into 1 path of serial optical signals, and output the optical signals at an output end;

the N × 1 optical switch 3 may include a Mechanical optical switch, a waveguide optical switch, and a Micro-Electro-Mechanical System (MEMS) optical switch.

The controller 4 is used for controlling the working frequency synchronization, the working time synchronization and the working state synchronization of the serial/parallel conversion unit 1, the single photon source unit group 2 and the Nx 1 optical switch 3; the controller 4 provides a clock signal and a control signal for the serial/parallel conversion unit 1, the single photon source unit group 2 and the Nx 1 photoswitch 3, and monitors the alarm information;

the controller 4 may include a built-in clock and an external interface;

the clock source of the built-in clock can comprise a constant temperature crystal oscillator, a rubidium atomic clock and a cesium atomic clock;

the external interface can comprise an IRIG-B DC code clock signal interface, a trigger pulse input/output interface, an RS232 management interface and a USB interface;

the controller 4 extracts frequency and phase synchronization information from the input electrical signal entering the input of the serial/parallel conversion unit 1.

A method of controlling a single photon source single photon output system, the method comprising:

inputting 1-path high-speed serial electric signal, and converting the input 1-path high-speed serial electric signal into N-path parallel electric signals with low code rate by a serial/parallel conversion unit 1;

the single photon source unit group 2 respectively converts N paths of parallel electric signals into N paths of parallel optical signals through the parallel work of N single photon source units with the same performance;

the Nx1 optical switch 3 is used for converting the N paths of parallel optical signals into 1 path of serial optical signals and outputting the optical signals at the output end;

the input end of the single photon source unit x is connected with the x-th path of electric signals at the output end of the serial/parallel conversion unit 1 through a cable, the output end of the single photon source unit x is connected with the x-th path of optical signals at the input end of the Nx 1 optical switch 3 through an optical fiber, and x is more than or equal to 1 and less than or equal to N.

FIG. 2 is a diagram showing the electrical signal timing relationship of the serial/parallel conversion unit of the single photon source single photon output system according to the embodiment of the invention; as shown in fig. 2, the serial/parallel conversion unit 1 converts the input 1-channel high-speed serial electrical signal into N-channel parallel electrical signals with a low code rate, and may include:

the serial/parallel conversion unit 1 is controlled by the controller 4 to complete the serial/parallel conversion of input electric signals, and converts 1-path serial electric signals into N-path parallel electric signals, wherein N is a positive integer;

the serial/parallel conversion unit 1 is controlled by the controller 4 and periodically works in a polling mode with equal intervals from 1 to N, and each cycle corresponds to N serial electric pulses in the serial electric signals;

the serial/parallel conversion unit 1 is controlled by the controller 4, the conduction time of the serial/parallel conversion unit is the time interval of passing through 1 electric pulse, and each electric pulse passes through the serial/parallel conversion unit 1 at the middle point of the conduction time interval;

the x-th path of electric signals at the output end of the serial/parallel conversion unit 1 are related to the x-th path of optical signals at the input end of the Nx 1 optical switch 3, and in each working period, the input end and the output end of the single photon source unit x in the single photon source unit group 2 respectively correspond to the x-th path of electric signals at the output end of the serial/parallel conversion unit 1 and the x-th path of optical signals at the input end of the Nx 1 optical switch 3, wherein x is more than or equal to 1 and is less than or equal to N.

The single photon source unit group 2 converts N paths of parallel electrical signals into N paths of parallel optical signals respectively through parallel work of N single photon source units with the same performance, and may include:

the single photon source unit group 2 is controlled by the controller 4, so that the working frequency synchronization, the working time synchronization and the working state synchronization among the N single photon source units in the single photon source unit group 2 are ensured.

The converting N channels of parallel optical signals into 1 channel of serial optical signals by using the nx1 optical switch 3 may include:

fig. 3 shows a logic diagram of the N × 1 optical switch control method of the single photon source single photon output system according to the embodiment of the present invention, as shown in fig. 3, the N × 1 optical switch 3 is controlled by the controller (4), and periodically operates in a polling manner at equal intervals from 1 to N, where each cycle corresponds to N serial optical pulses in a serial optical signal;

fig. 4 shows a schematic diagram of an nx 1 optical switch of a single photon source single photon output system according to an embodiment of the present invention, as shown in fig. 4, the nx 1 optical switch 3 is controlled by a controller (4), keeps the working time, the working frequency, and the working state thereof synchronous with the working time, the working frequency, and the working state of the serial/parallel conversion unit 1, converts N paths of parallel input optical signals into 1 path of serial optical signals, and N is a positive integer;

fig. 5 shows a timing relationship diagram of N × 1 optical switch signals of a single photon source single photon output system according to an embodiment of the present invention, as shown in fig. 5, the 1 st to nth single photon source units in the single photon source unit group 2 collectively output N parallel optical signals, each path of the N parallel optical signals corresponds to 1 optical pulse in each period, each optical pulse passes through the N × 1 optical switch 3 around a midpoint of an on time interval of the optical switch, and the N parallel optical signals are converted into 1 serial optical signals by the N × 1 optical switch 3 and output.

Specifically, the controller 4 controls the function execution of the serial/parallel conversion unit 1, the single photon source unit group 2 and the nx 1 optical switch 3;

the controller 4 provides a clock signal and a control signal for the serial/parallel conversion unit 1, the single photon source unit group 2 and the Nx 1 photoswitch 3, and monitors the alarm information;

the controller 4 ensures that the serial/parallel conversion unit 1 periodically polls the work and the nx1 optical switch 3 periodically polls the work to be associated with each other, so as to realize a one-to-one correspondence relationship, the x-th path of electric signal at the output end of the serial/parallel conversion unit 1 is associated with the x-th path of optical signal at the input end of the nx1 optical switch 3, and in each working period, the input end and the output end of the single photon source unit x in the single photon source unit group 2 respectively correspond to the x-th path of electric signal at the output end of the serial/parallel conversion unit 1 and the x-th path of optical signal at the input end of the nx1 optical switch 3, wherein x is more than or equal to 1 and is less;

the clock synchronization signal may include a working frequency synchronization signal, a working phase synchronization signal, and a working time synchronization signal, and the alarm information is fault alarm information.

Example 1

Fig. 6 is a schematic structural diagram of a single-photon source single-photon output system with a quadruple single-photon output rate according to embodiment 1 of the present invention, and as shown in fig. 6, the system may include:

the device comprises a serial/parallel conversion unit, a single photon source unit group, a 4X 1 photoswitch and a controller;

the serial/parallel conversion unit, the single photon source unit group and the 4 multiplied by 1 photoswitch are connected in sequence;

the controller is respectively connected with the serial/parallel conversion unit, the single photon source unit group and the 4 multiplied by 1 photoswitch in a bidirectional way;

the serial/parallel conversion unit is connected with the single photon source unit group through 4 cables of the same type with the same performance and the same length, and the single photon source unit group is connected with the 4 multiplied by 1 optical switch through 4 optical fibers of the same type with the same performance and the same length.

The serial/parallel conversion unit is used for converting the input end 1-path high-speed serial electric signal into 4-path parallel electric signals with low code rate;

the serial/parallel conversion unit may include a 1 × 4 electrical switch or a first-in-first-out serial/parallel conversion unit;

the 1 x 4 electrical switch is a rotary microelectromechanical system 1 x 4 electrical switch.

FIG. 7 is a schematic diagram showing the operation of a 1 × 4 electric switch of a single photon source single photon output system with four-fold increase of single photon output rate according to example 1 of the present invention;

the single photon source unit group is used for converting 4 paths of parallel electric signals into 4 paths of parallel optical signals through 4 single photon source units with the same performance;

the single photon source unit group is formed by arranging 4 single photon source units with the same performance in parallel, and N is 4;

The 4 × 1 optical switch is used for converting 4 paths of parallel optical signals into 1 path of serial optical signals and outputting the optical signals at an output end;

the 4 x 1 optical switch includes a mechanical optical switch, a waveguide optical switch, and a micro-electromechanical system optical switch.

The controller is used for controlling the working frequency synchronization, the working time synchronization and the working state synchronization of the serial/parallel conversion unit, the single photon source unit group and the 4 multiplied by 1 photoswitch; the controller provides clock signals and control signals for the serial/parallel conversion unit, the single photon source unit group and the 4 multiplied by 1 photoswitch and monitors alarm information of the serial/parallel conversion unit, the single photon source unit group and the 4 multiplied by 1 photoswitch;

the controller comprises a built-in clock and an external interface;

the controller extracts frequency and phase synchronization information from the input electrical signal entering the input of the serial/parallel conversion unit.

inputting 1-path high-speed serial electric signal, and converting the input 1-path high-speed serial electric signal into 4-path parallel electric signals with low code rate by a serial/parallel conversion unit;

the single photon source unit group respectively converts 4 paths of parallel electric signals into 4 paths of parallel optical signals through parallel work of 4 single photon source units with the same performance;

4 paths of parallel optical signals are converted into 1 path of serial optical signals by a 4 multiplied by 1 optical switch, and the optical signals are output at an output end;

the input end of the single photon source unit x is connected with the x-th path of electric signals at the output end of the serial/parallel conversion unit through a cable, the output end of the single photon source unit x is connected with the x-th path of optical signals at the input end of the 4 x 1 optical switch through an optical fiber, and x is more than or equal to 1 and less than or equal to 4.

The serial/parallel conversion unit converts an input 1-channel high-speed serial electric signal into a 4-channel parallel electric signal with a low code rate, and comprises:

the serial/parallel conversion unit is controlled by the controller to complete the serial/parallel conversion of the input electric signals, 1 path of serial electric signals are converted into 4 paths of parallel electric signals, and 4 positive integers are taken;

the serial/parallel conversion unit is controlled by the controller and periodically works in a polling mode with equal intervals of 1 to 4, and each period corresponds to 4 serial electric pulses in the serial electric signals;

the serial/parallel conversion unit is controlled by the controller, the conduction time of the serial/parallel conversion unit is the time interval of passing through 1 electric pulse, and each electric pulse passes through the serial/parallel conversion unit at the left and right of the middle point of the conduction time interval;

the x-th path of electric signals at the output end of the serial/parallel conversion unit are related to the x-th path of optical signals at the input end of the 4 x 1 optical switch, and in each working period, the input end and the output end of a single photon source unit x in the single photon source unit group respectively correspond to the x-th path of electric signals at the output end of the serial/parallel conversion unit and the x-th path of optical signals at the input end of the 4 x 1 optical switch, wherein x is more than or equal to 1 and less than or equal to 4.

The single photon source unit group respectively converts 4 paths of parallel electric signals into 4 paths of parallel optical signals through parallel work of 4 single photon source units with the same performance, and the method comprises the following steps:

the single photon source unit group is controlled by the controller, so that the working frequency synchronization, the working time synchronization and the working state synchronization among 4 single photon source units in the single photon source unit group are ensured.

The method for converting 4 paths of parallel optical signals into 1 path of serial optical signals by using a 4 x 1 optical switch comprises the following steps:

the 4 x 1 optical switch is controlled by the controller, periodically works in a polling mode with equal intervals of 1 to 4, and each period corresponds to 4 serial optical pulses in the serial optical signals;

the 4 x 1 optical switch is controlled by the controller, keeps the working time, the working frequency and the working state of the 4 x 1 optical switch synchronous with the working time, the working frequency and the working state of the serial/parallel conversion unit, and converts 4 paths of parallel input optical signals into 1 path of serial optical signals;

and 1 st to 4 th single photon source units in the single photon source unit group output 4 paths of parallel optical signals in total, each path of the 4 paths of parallel optical signals corresponds to 1 optical pulse in each period, each optical pulse passes through a 4 x 1 optical switch at the left and right of the midpoint of the conduction time interval of the optical switch, and the 4 paths of parallel optical signals are converted into 1 path of serial optical signals through the 4 x 1 optical switch to be output.

The controller controls the function execution of the serial/parallel conversion unit, the single photon source unit group and the 4 multiplied by 1 photoswitch;

the controller provides clock signals and control signals for the serial/parallel conversion unit, the single photon source unit group and the 4 multiplied by 1 photoswitch and monitors alarm information of the serial/parallel conversion unit, the single photon source unit group and the 4 multiplied by 1 photoswitch;

the controller ensures that the serial/parallel conversion unit periodically polls the work and the 4 x 1 optical switch periodically polls the work and is associated with each other, so as to realize a one-to-one correspondence relationship, the x-th path of electric signal at the output end of the serial/parallel conversion unit is associated with the x-th path of optical signal at the input end of the 4 x 1 optical switch, and in each work period, the input end and the output end of a single photon source unit x in the single photon source unit group respectively correspond to the x-th path of electric signal at the output end of the serial/parallel conversion unit and the x-th path of optical signal at the input end of the 4 x 1 optical switch, wherein x is more than or equal to;

For example, in a specific implementation project, in order to solve the problem of quadruple increase of single photon output rate, a single photon source System with N being 4 and quadruple increase of single photon output rate is taken, a serial/parallel conversion unit is a 1 × 4 electric switch of a rotary Micro-Electro-Mechanical System (MEMS), a single photon source unit group is a 4 parameter down-conversion single photon source units with the same model and the same performance, the minimum interval time Δ τ between single photons output by each parameter down-conversion single photon source unit is 2ns, a maximum output frequency of a single photon pulse is 500 mhz.4 × 1 optical switch is a movable mirror Mechanical optical switch, a built-in clock of a controller is a constant temperature crystal oscillator, the actual constant temperature crystal oscillator precision is not inferior to ± 5ppb, and 1ppb is 10 ppb^-9The controller external interface may include: an IRIG-B DC code clock signal output interface, a 10MHz low-phase noise direct output interface, a 1-path 1PPS synchronous input interface, an RS232 management interface and a USB interface (not lower than USB 2.0, used for system debugging, data storage and printing).

Technical solution of this embodimentThe single photon source system can improve the single photon generating rate, the single photon output rate of the whole system is 4 times of that of a single photon source device, the maximum output frequency of single photon pulses is 4 times of that of the single photon source device, and meanwhile, the efficiency of each single photon source is not reduced. The minimum interval time delta tau between single photons output by each parametric down-conversion single photon source unit is 2ns, and the maximum output frequency of single photon pulses is 500 MHz; the minimum interval time between single photons output by the single photon source system formed by the method of the invention is ensured to be the same as that of the single photon source system under the condition of not reducing the efficiency of each single photon source

The maximum output frequency of the single photon pulse is 4 × 500-2 GHz, and under the condition that the efficiency of each single photon source is not reduced, the single photon which is 4 times of the optical pulse signal flow rate allowed by a single photon source device can be normally output, so that the optimization effect of improving the output code rate of the single photon source system is achieved.

The embodiment, as a high-speed single-photon signal source, can be used for improving the speed and precision of a quantum logic gate, and has wide application prospects in the fields of quantum computing (quantum computing) and quantum computers (quantum computers). Meanwhile, in the aspect of a parametric down-conversion single-photon source device, the development of a Photonic integration technology can be promoted, and the engineering application of a Photonic Integrated Circuit (PIC) is popularized.

Example 2

FIG. 8 is a schematic structural diagram of a single-photon source single-photon output system with sixteen-fold increased single-photon output rate according to embodiment 2 of the present invention, and as shown in FIG. 8, the system may include:

the device comprises a serial/parallel conversion unit, a single photon source unit group, a 16X 1 photoswitch and a controller;

the serial/parallel conversion unit, the single photon source unit group and the 16 multiplied by 1 photoswitch are connected in sequence;

the controller is respectively connected with the serial/parallel conversion unit, the single photon source unit group and the 16 multiplied by 1 photoswitch in a bidirectional way;

the serial/parallel conversion unit is connected with the single photon source unit group through 16 cables of the same type with the same performance and the same length, and the single photon source unit group is connected with the 16 multiplied by 1 optical switch through 16 optical fibers of the same type with the same performance and the same length.

The serial/parallel conversion unit is used for converting the input end 1-path high-speed serial electric signal into 16-path parallel electric signals with low code rate;

the serial/parallel conversion unit may include a 1 × 16 electrical switch or a first-in-first-out serial/parallel conversion unit;

the 1 x 16 electrical switch is a rotary microelectromechanical system 1 x 16 electrical switch.

The single photon source unit group is used for converting 16 paths of parallel electric signals into 16 paths of parallel optical signals through 16 single photon source units with the same performance;

the single photon source unit group is formed by arranging 16 single photon source units with the same performance in parallel;

The 16 × 1 optical switch is used for converting 16 paths of parallel optical signals into 1 path of serial optical signals and outputting the optical signals at an output end;

the 16 x 1 optical switch includes a mechanical optical switch, a waveguide optical switch, and a micro-electromechanical system optical switch.

The controller is used for controlling the working frequency synchronization, the working time synchronization and the working state synchronization of the serial/parallel conversion unit, the single photon source unit group and the 16 x 1 photoswitch; the controller provides clock signals and control signals for the serial/parallel conversion unit, the single photon source unit group and the 16 multiplied by 1 photoswitch and monitors alarm information of the serial/parallel conversion unit, the single photon source unit group and the 16 multiplied by 1 photoswitch;

the controller comprises a built-in clock and an external interface;

inputting 1-path high-speed serial electric signals, and converting the input 1-path high-speed serial electric signals into 16-path parallel electric signals with low code rate by a serial/parallel conversion unit;

the single photon source unit group respectively converts 16 paths of parallel electric signals into 16 paths of parallel optical signals through the parallel work of 16 single photon source units with the same performance;

16 paths of parallel optical signals are converted into 1 path of serial optical signals by a 16 multiplied by 1 optical switch, and the optical signals are output at an output end;

the input end of the single photon source unit x is connected with the x-th path of electric signals at the output end of the serial/parallel conversion unit through a cable, the output end of the single photon source unit x is connected with the x-th path of optical signals at the input end of the 16 x 1 optical switch through an optical fiber, and x is more than or equal to 1 and less than or equal to 16.

The serial/parallel conversion unit converts an input 1-channel high-speed serial electric signal into an N-channel parallel electric signal with a low code rate, and comprises:

the serial/parallel conversion unit is controlled by the controller to complete the serial/parallel conversion of the input electric signals, and converts 1-path serial electric signals into 16-path parallel electric signals;

the serial/parallel conversion unit is controlled by the controller and periodically works in a polling mode with equal intervals of 1 to 16, and each cycle corresponds to 16 serial electric pulses in the serial electric signals;

the x-th path of electric signals at the output end of the serial/parallel conversion unit are related to the x-th path of optical signals at the input end of the 16 x 1 optical switch, and in each working period, the input end and the output end of the single photon source unit x in the single photon source unit group respectively correspond to the x-th path of electric signals at the output end of the serial/parallel conversion unit and the x-th path of optical signals at the input end of the 16 x 1 optical switch, wherein x is more than or equal to 1 and less than or equal to 16.

The single photon source unit group respectively converts 16 paths of parallel electric signals into 16 paths of parallel optical signals through the parallel work of 16 single photon source units with the same performance, and the method comprises the following steps:

the single photon source unit group is controlled by the controller, so that the working frequency synchronization, the working time synchronization and the working state synchronization among the 16 single photon source units in the single photon source unit group are ensured.

The method for converting 16 paths of parallel optical signals into 1 path of serial optical signals by using a 16 x 1 optical switch comprises the following steps:

the 16 × 1 optical switch is controlled by the controller, periodically works in a polling mode with equal intervals of 1 to 16, and each cycle corresponds to 16 serial optical pulses in the serial optical signals;

the 16 x 1 optical switch is controlled by the controller, keeps the working time, the working frequency and the working state of the optical switch synchronous with the working time, the working frequency and the working state of the serial/parallel conversion unit, and converts 16 paths of parallel input optical signals into 1 path of serial optical signals;

the 1 st to 16 th single photon source units in the single photon source unit group output 16 paths of parallel optical signals in total, each path of the 16 paths of parallel optical signals corresponds to 1 optical pulse in each period, each optical pulse passes through a 16 × 1 optical switch at the left and right middle points of the conduction time interval of the optical switch, and the 16 paths of parallel optical signals are converted into 1 path of serial optical signals through the 16 × 1 optical switch to be output.

The controller controls the function execution of the serial/parallel conversion unit, the single photon source unit group and the 16 multiplied by 1 photoswitch;

the controller provides clock signals and control signals for the serial/parallel conversion unit, the single photon source unit group and the 16 multiplied by 1 photoswitch and monitors alarm information of the serial/parallel conversion unit, the single photon source unit group and the 16 multiplied by 1 photoswitch;

the controller ensures that the serial/parallel conversion unit periodically polls the work and the 16 × 1 optical switch periodically polls the work and is associated with each other, so as to realize a one-to-one correspondence relationship, the x-th path of electric signal at the output end of the serial/parallel conversion unit is associated with the x-th path of optical signal at the input end of the 16 × 1 optical switch, and in each working period, the input end and the output end of a single photon source unit x in the single photon source unit group respectively correspond to the x-th path of electric signal at the output end of the serial/parallel conversion unit and the x-th path of optical signal at the input end of the 16 × 1 optical switch, wherein x is more than or equal to;

For example, in a specific implementation project, in order to solve the problem of increasing the single photon output rate by sixteen times, a single photon source system that increases the single photon output rate by sixteen times with N being 16 is taken; the serial/parallel conversion unit may include a serial/parallel converter and a first-in first-out buffer connected in sequence, where the serial/parallel converter performs conversion of 1-way serial to N-way parallel electrical signals, and the buffer depth of each way of the first-in first-out buffer, whose output end N ═ 16-way parallel electrical signals, is 2 × N × Δ τ ═ 2 × 16 × 4ns ═ 128 ns. For example, if the output code rate of each single-photon source unit is 250Mbit/s, the buffer depth of each path is 250Mbit/s × 128 ns-32 bits. The single photon source unit group is 16 nano-antenna single photon source units with the same type and the same performance, the minimum interval time delta tau between single photons output by each nano-antenna single photon source unit is 4ns, and the maximum output frequency of single photon pulses is 250 MHz. The 16 x 1 optical switch is a waveguide type electro-optic effect optical switch. The built-in clock of the controller is a rubidium atomic clock, the precision of the actual rubidium atomic clock is selected to be not less than +/-0.01 ppb, and the external interface of the controller can comprise: an IRIG-B DC code clock signal output interface, a 10MHz low-phase noise direct output interface, a 1-path 1PPS synchronous input interface, an RS232 management interface and a USB interface (not lower than USB 3.0, used for system debugging, data storage and printing).

The technical scheme of the embodiment can improve the single photon generating rate of the single photon source system, the single photon output rate of the whole system is sixteen times of that of a single photon source device, the maximum output frequency of single photon pulses is 16 times of that of a single photon source device, and meanwhile, the efficiency of each single photon source is not reduced. The minimum interval time delta tau between single photons output by each nano-antenna single photon source unit is 4ns, and the maximum output frequency of single photon pulses is 250 MHz; the minimum interval time between single photons output by the single photon source system formed by the method of the invention is ensured to be the same as that of the single photon source system under the condition of not reducing the efficiency of each single photon source

The maximum output frequency of the single photon pulse is 16 × 250-4 GHz, and under the condition that the efficiency of each single photon source is not reduced, the single photon which is 16 times of the optical pulse signal flow rate allowed by a single photon source device can be normally output, so that the optimization effect of improving the output code rate of the single photon source system is achieved.

The embodiment can be used for a single photon signal source, and has wide application prospect in the fields of high-resolution spectral measurement, nondestructive substance analysis, high-speed phenomenon detection, precision analysis, atmospheric pollution measurement, bioluminescence, radioactivity detection, high-energy physics, astronomical photometry, laser ranging, laser radar and the like. Meanwhile, in the aspect of a nano-antenna single-photon source device, the development of a Photonic integration technology can be promoted, and the engineering application of a Photonic Integrated Circuit (PIC) is popularized.

Example 3

Figure 9 shows a schematic structural diagram of a single-photon source single-photon output system with a sixty-four times increased single-photon output rate according to embodiment 3 of the present invention, and as shown in figure 9, the system may include:

the device comprises a serial/parallel conversion unit, a single photon source unit group, a 64X 1 photoswitch and a controller;

the serial/parallel conversion unit, the single photon source unit group and the 64 multiplied by 1 photoswitch are connected in sequence;

the controller is respectively connected with the serial/parallel conversion unit, the single photon source unit group and the 64 multiplied by 1 photoswitch in a bidirectional way;

the serial/parallel conversion unit is connected with the single photon source unit group through 64 cables of the same type with the same performance and the same length, and the single photon source unit group is connected with the 64 multiplied by 1 optical switch through 64 optical fibers of the same type with the same performance and the same length.

The serial/parallel conversion unit is used for converting the input end 1-path high-speed serial electric signal into 64-path parallel electric signals with low code rate;

the serial/parallel conversion unit may include a 1 × 64 electrical switch or a first-in-first-out serial/parallel conversion unit;

the 1 x 64 electrical switch is a rotary microelectromechanical system 1 x 64 electrical switch.

The single photon source unit group is used for converting 64 paths of parallel electric signals into 64 paths of parallel optical signals through 64 single photon source units with the same performance;

the single photon source unit group is formed by arranging 64 single photon source units with the same performance in parallel;

The 64 × 1 optical switch is used for converting the 64 paths of parallel optical signals into 1 path of serial optical signals and outputting the optical signals at an output end;

the 64 x 1 optical switch includes a mechanical optical switch, a waveguide optical switch, and a mems optical switch.

The controller is used for controlling the working frequency synchronization, the working time synchronization and the working state synchronization of the serial/parallel conversion unit, the single photon source unit group and the 64 multiplied by 1 photoswitch; the controller provides clock signals and control signals for the serial/parallel conversion unit, the single photon source unit group and the 64 multiplied by 1 optical switch, and monitors alarm information of the serial/parallel conversion unit, the single photon source unit group and the 64 multiplied by 1 optical switch;

the controller comprises a built-in clock and an external interface;

inputting 1-path high-speed serial electric signals, and converting the input 1-path high-speed serial electric signals into 64-path parallel electric signals with low code rate by a serial/parallel conversion unit;

the single photon source unit group respectively converts 64 paths of parallel electric signals into 64 paths of parallel optical signals through the parallel work of 64 single photon source units with the same performance;

converting 64 paths of parallel optical signals into 1 path of serial optical signals by using a 64 multiplied by 1 optical switch, and outputting the optical signals at an output end;

the input end of the single photon source unit x is connected with the x-th path of electric signals at the output end of the serial/parallel conversion unit through a cable, the output end of the single photon source unit x is connected with the x-th path of optical signals at the input end of the 64 x 1 optical switch through an optical fiber, and x is more than or equal to 1 and less than or equal to 64.

The serial/parallel conversion unit converts an input 1-channel high-speed serial electric signal into a 64-channel parallel electric signal with a low code rate, and comprises:

the serial/parallel conversion unit is controlled by the controller to complete the serial/parallel conversion of the input electric signals, and converts 1-path serial electric signals into 64-path parallel electric signals;

the serial/parallel conversion unit is controlled by the controller and periodically works in a polling mode with equal intervals of 1 to 64, and each cycle corresponds to 64 serial electric pulses in the serial electric signals;

the x-th path of electric signals at the output end of the serial/parallel conversion unit are related to the x-th path of optical signals at the input end of the 64 x 1 optical switch, and in each working period, the input end and the output end of the single photon source unit x in the single photon source unit group respectively correspond to the x-th path of electric signals at the output end of the serial/parallel conversion unit and the x-th path of optical signals at the input end of the 64 x 1 optical switch, wherein x is more than or equal to 1 and is less than or equal to 64.

The single photon source unit group respectively converts 64 paths of parallel electric signals into 64 paths of parallel optical signals through the parallel work of 64 single photon source units with the same performance, and the method comprises the following steps:

the single photon source unit group is controlled by the controller, so that the working frequency synchronization, the working time synchronization and the working state synchronization among 64 single photon source units in the single photon source unit group are ensured.

The method for converting 64 paths of parallel optical signals into 1 path of serial optical signals by using a 64 x 1 optical switch comprises the following steps:

the 64 x 1 optical switch is controlled by the controller, and periodically works in a polling mode at equal intervals of 1 to 64, and each cycle corresponds to 64 serial optical pulses in the serial optical signals;

the 64 x 1 optical switch is controlled by a controller, keeps the working time, the working frequency and the working state of the 64 x 1 optical switch synchronous with the working time, the working frequency and the working state of the serial/parallel conversion unit, and converts 64 paths of parallel input optical signals into 1 path of serial optical signals;

the 1 st to 64 th single-photon source units in the single-photon source unit group output 64 paths of parallel optical signals in total, each path of the 64 paths of parallel optical signals corresponds to 1 optical pulse in each period, each optical pulse passes through a 64 × 1 optical switch at the left and right middle points of the conduction time interval of the optical switch, and the 64 paths of parallel optical signals are converted into 1 path of serial optical signals through the 64 × 1 optical switch to be output.

The controller controls the function execution of the serial/parallel conversion unit, the single photon source unit group and the 64 multiplied by 1 photoswitch;

the controller provides clock signals and control signals for the serial/parallel conversion unit, the single photon source unit group and the 64 multiplied by 1 optical switch, and monitors alarm information of the serial/parallel conversion unit, the single photon source unit group and the 64 multiplied by 1 optical switch;

the controller ensures that the serial/parallel conversion unit periodically polls the work and the 64 multiplied by 1 optical switch periodically polls the work and is associated with each other, so as to realize a one-to-one correspondence relationship, the x-th path of electric signal at the output end of the serial/parallel conversion unit is associated with the x-th path of optical signal at the input end of the 64 multiplied by 1 optical switch, and in each working period, the input end and the output end of a single photon source unit x in the single photon source unit group respectively correspond to the x-th path of electric signal at the output end of the serial/parallel conversion unit and the x-th path of optical signal at the input end of the 64 multiplied by 1 optical switch, wherein x is more than or;

For example, in a specific implementation project, in order to solve the problem of raising the single photon output rate by sixty-four times, a single photon source system that raises the single photon output rate by sixty-four times is taken as N64;

the serial/parallel conversion unit may include a serial/parallel converter and a first-in first-out buffer connected in sequence, where the serial/parallel converter performs conversion of 1-way serial to N-way parallel electrical signals, and the buffer depth of each way of the first-in first-out buffer is 2 × N × Δ τ — 2 × 64 × 10ns — 1280 ns. For example, if the output code rate of each single-photon source unit is 100Mbit/s, the buffer depth of each path is 100Mbit/s × 1280ns, which is 128 bits. The single photon source unit group is a 16-channel quantum dot single photon source with 4 groups of same performances and the same type, the minimum interval time delta tau between single photons output by the quantum dot single photon source of each single channel is 10ns, and the maximum output frequency of single photon pulses is 100 MHz. The 64 × 1 optical switch is a Micro-Electro-Mechanical System (MEMS) optical switch that electrostatically drives the Micro-mirrors to rotate. The controller built-in clock is a cesium atomic clock, the actual cesium atomic clock precision is selected to be not less than +/-0.001 ppb, and the controller external interface can comprise: an IRIG-B DC code clock signal output interface, a 10MHz low-phase noise direct output interface, a 1-path 1PPS synchronous input interface, an RS232 management interface and a USB interface (not lower than USB 3.0, used for system debugging, data storage and printing).

The technical scheme of the embodiment can improve the single photon generating rate of the single photon source system, the single photon output rate of the whole system is sixty-four times of that of a single photon source device, the maximum output frequency of single photon pulses is 64 times of that of a single photon source device, and meanwhile, the efficiency of each single photon source is not reduced. The minimum interval time delta tau between single photons output by the quantum dot single photon source of each single channel is 10ns, and the maximum output frequency of single photon pulses is 100 MHz; the minimum interval time between single photons output by the single photon source system formed by the method of the invention is ensured to be the same as that of the single photon source system under the condition of not reducing the efficiency of each single photon source

The maximum output frequency of the single photon pulse is 64 × 100-6400 MHz, and under the condition that the efficiency of each single photon source is not reduced, the single photon which is 64 times of the optical pulse signal flow rate allowed by a single photon source device can be normally output, thereby achieving the optimization effect of improving the output code rate of the single photon source system.

The embodiment can be used for constructing a high-speed long-distance quantum communication receiving system, in particular a high-speed long-distance Quantum Key Distribution (QKD) system. Meanwhile, in the aspect of quantum dot single photon source, the development of photon integration technology can be promoted, and the engineering application of Photon Integrated Circuits (PICs) is popularized.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims

1. A single photon source single photon output system, said system comprising: the device comprises a serial/parallel conversion unit (1), a single photon source unit group (2), an Nx 1 photoswitch (3) and a controller (4);

the serial/parallel conversion unit (1) is connected with the single photon source unit group (2) through N same-type cables with the same performance and the same length, and the single photon source unit group (2) is connected with the Nx 1 optical switch (3) through N same-type optical fibers with the same performance and the same length; n is a positive integer;

the controller (4) is used for controlling the working frequency synchronization, the working time synchronization and the working state synchronization of the serial/parallel conversion unit (1), the single photon source unit group (2) and the Nx 1 photoswitch (3); the controller (4) provides clock signals and control signals for the serial/parallel conversion unit (1), the single photon source unit group (2) and the Nx 1 optical switch (3), and monitors alarm information of the serial/parallel conversion unit;

the controller (4) comprises a built-in clock and an external interface;

the clock source of the built-in clock comprises a constant temperature crystal oscillator, a rubidium atomic clock or a cesium atomic clock;

the external interface comprises an IRIG-B DC code clock signal interface, a trigger pulse input/output interface, an RS232 management interface or a USB interface;

the controller (4) extracts frequency and phase synchronization information in the input electrical signal entering the input end of the serial/parallel conversion unit (1);

the control method of the single photon source single photon output system comprises the following steps:

the input end of the single photon source unit x is connected with the x-th path of electric signals at the output end of the serial/parallel conversion unit (1) through a cable, the output end of the single photon source unit x is connected with the x-th path of optical signals at the input end of the Nx 1 optical switch (3) through an optical fiber, x is more than or equal to 1 and less than or equal to N, and N is a positive integer.

2. The system of claim 1,

the 1 xn electrical switch is a rotary microelectromechanical system 1 xn electrical switch.

3. The system of claim 1,

the single photon source comprises a parametric down-conversion single photon source, a quantum dot single photon source or a nano antenna single photon source;

the single photon source array comprises a parametric down-conversion single photon source array device, a quantum dot single photon source array device or a nano antenna single photon source array device;

4. The system of claim 1,

the Nx 1 optical switch (3) comprises a mechanical optical switch, a waveguide optical switch or a micro-electro-mechanical system optical switch.

5. The system according to claim 1, wherein the serial/parallel conversion unit (1) converts an input 1-way high-speed serial electrical signal into an N-way parallel electrical signal of a low code rate, comprising:

6. The system as claimed in claim 1, wherein said single photon source unit group (2) converts N parallel electrical signals into N parallel optical signals by parallel operation of N single photon source units of the same performance, respectively, comprising:

7. The system of claim 1, wherein said converting N parallel optical signals to 1 serial optical signal using an nx1 optical switch (3) comprises:

the Nx 1 optical switch (3) is controlled by a controller (4), periodically works in a polling mode with equal intervals of 1 to N, and each period corresponds to N serial optical pulses in the serial optical signals;

8. A system as claimed in claim 1, characterized in that said controller (4) controls the functional execution of the serial/parallel conversion unit (1), the single-photon source unit group (2) and the nx 1 optical switch (3);

the clock signal comprises a working frequency synchronous signal, a working phase synchronous signal and a working time synchronous signal, and the alarm information is fault alarm information.