CN110149208B - Transmitting end coding module of integrated time phase coding quantum key distribution system - Google Patents
Transmitting end coding module of integrated time phase coding quantum key distribution system Download PDFInfo
- Publication number
- CN110149208B CN110149208B CN201910587489.XA CN201910587489A CN110149208B CN 110149208 B CN110149208 B CN 110149208B CN 201910587489 A CN201910587489 A CN 201910587489A CN 110149208 B CN110149208 B CN 110149208B
- Authority
- CN
- China
- Prior art keywords
- optical
- waveguide
- beam splitter
- optical waveguide
- chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
Abstract
The invention discloses an integrated transmitting end coding module of a time phase coding quantum key distribution system, which comprises a first optical fiber waveguide coupler, an optical waveguide chip and a second optical fiber waveguide coupler, wherein a first beam splitter, a first phase modulation module, a second beam splitter, an optical waveguide delay module and a beam combiner are integrated on the optical waveguide chip, the first optical fiber waveguide coupler is connected with the first beam splitter on the optical waveguide chip, the first beam splitter is connected with the first phase modulation module, the first beam splitter is connected with the second phase modulation module, the first phase modulation module is connected with the second beam splitter, the second beam splitter is connected with the beam combiner through the optical waveguide delay module, the second beam splitter is connected with the beam combiner, and the beam combiner is connected with the second optical fiber waveguide coupler. The invention can complete the modulation work of four quantum states of time phase coding, has large system manufacturing tolerance and greatly reduces the cost.
Description
Technical Field
The invention belongs to the technical field of quantum cryptography communication, and particularly relates to a transmitting end coding module of a time phase coding quantum key distribution system integrated in the quantum key distribution system.
Background
Quantum key distribution technology combines quantum physics principles with modern communication technologies. The quantum key distribution ensures the security of the key negotiation process and results in different places by virtue of a physical principle, and can realize secret communication independent of algorithm complexity by combining with a one-time pad encryption technology.
At present, quantum cryptography mainly uses light quanta as a carrier for realization, and the light quanta are distributed through free space or optical fiber channels. The quantum key distribution equipment loads classical random bits on physical quantities such as polarization, phase and time of light quanta by various optical modulation equipment according to the requirements of different quantum key distribution protocols for transmission, thereby realizing the distribution of quantum keys.
A typical QKD system generally includes a transmitting end for encoding a key on a light quantum and a receiving end for decoding and measuring the light quantum. Therefore, for the transmitting end of the QKD system, the optical quantum needs to be modulated into different states by phase modulation or polarization modulation, and the different optical quantum states represent different codesAnd (4) information. Time phase encoding is one of the quantum state encoding modes. For time phase encoding, it typically requires the QKD system transmitter to prepare four states that are resolved on the phase measurement basis and the time measurement basis, which are states |0 in the Z-basis, respectively>And state |1>And states in the Y radical
And state
As shown in state 1 to state 4 in fig. 1, respectively. Wherein the two states in the Z-base represent the states in which the optical pulse exists only in the preceding time stamp or the following time stamp, respectively, and the states in the Y-base are the same as those in a general phase encoding system, i.e., the states in which the optical pulses on two adjacent time stamps are different in phase by 90 degrees or 270 degrees. An encoding module is required at the transmitting end of the time-phase QKD system to implement the modulation of the tailored optical quantum states.
Meanwhile, the QKD optical integrated chip is a very important research direction all over the world nowadays, and various optical systems originally based on various independent optical devices can be integrated into a chip with a very small volume by using the technology, so that the cost is greatly reduced firstly, and the application range of the QKD technology can be greatly enlarged secondly.
In summary, it is a current development trend to provide a novel on-chip time phase QKD system transmitting end coding module to replace the existing time phase system transmitting end, and the novel structure is utilized to complete the modulation work of four quantum states of time phase coding, thereby realizing various QKD protocol systems of time phase coding, including BB84 protocol, MDI protocol, etc., and compared with the existing time phase system transmitting end, the system manufacturing tolerance is large, and the cost is greatly reduced.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a transmitting end encoding module of an integrated time phase encoding quantum key distribution system aiming at the defects of the prior art, the transmitting end encoding module of the integrated time phase encoding quantum key distribution system can complete the modulation work of four quantum states of time phase encoding, thereby realizing various QKD protocol systems of time phase encoding, including BB84 protocol, MDI protocol and the like, and compared with the transmitting end of the existing time phase system, the system manufacturing tolerance is large, and the cost is greatly reduced.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a transmitting end coding module of an integrated time phase coding quantum key distribution system comprises a first optical fiber waveguide coupler, an optical waveguide chip and a second optical fiber waveguide coupler, wherein a first beam splitter, a first phase modulation module, a second beam splitter, an optical waveguide delay module and a beam combiner are integrated on the optical waveguide chip, the first optical fiber waveguide coupler is connected with an incident port of the first beam splitter on the optical waveguide chip through a waveguide line, an emergent port of the first beam splitter is connected with the first phase modulation module through a waveguide line, the other emergent port of the first beam splitter is connected with the second phase modulation module through a waveguide line, the first phase modulation module is connected with an incident port of the second beam splitter through a waveguide line, the second phase modulation module is connected with the other incident port of the second beam splitter through a waveguide line, an emergent port of the second beam splitter is connected with an incident port of the beam combiner through a waveguide line, and the waveguide line is provided with the waveguide line The other exit port of the second beam splitter is connected with the other incident port of the beam combiner through a waveguide line, and the exit port of the beam combiner is connected with the second fiber waveguide coupler;
the first optical fiber waveguide coupler is connected with a first optical fiber and used for coupling and connecting the first optical fiber with a waveguide line on the optical waveguide chip, and the second optical fiber waveguide coupler is connected with a second optical fiber and used for coupling and connecting the second optical fiber with the waveguide line on the optical waveguide chip;
the first optical fiber is used for receiving the incident optical pulse and coupling the received optical pulse into the optical waveguide chip through the first optical fiber waveguide coupler, the optical pulse is transmitted to the first beam splitter along a waveguide line in the optical waveguide chip, the first beam splitter divides the optical pulse into two beams of optical pulses, one beam of optical pulse enters the second beam splitter after passing through the first phase modulation module, the other beam of optical pulse enters the second beam splitter after passing through the second phase modulation module, the two beams of optical pulses are combined and interfered in the second beam splitter, an interference result is emitted from two emitting ports of the second beam splitter, the optical pulse emitted from one emitting port of the second beam splitter enters the beam combiner through the optical waveguide delay module on the waveguide line, the optical pulse emitted from the other emitting port of the second beam splitter enters the beam combiner through the waveguide line, the beam combiner combines the optical pulses and outputs the combined optical pulse to the second optical fiber waveguide coupler, and the second optical fiber waveguide coupler emits the optical pulse through the second optical fiber.
As a further improved technical scheme of the present invention, the number of the optical waveguide chips is 2, and the optical waveguide chips are respectively an optical waveguide chip one and an optical waveguide chip two, the beam splitter one, the phase modulation module one and the phase modulation module two are disposed in the optical waveguide chip one, the beam splitter two, the optical waveguide delay module and the beam combiner are disposed in the optical waveguide chip two, a waveguide line connected to the phase modulation module one in the optical waveguide chip one and a waveguide line connected to an incident port of the beam splitter two in the optical waveguide chip two are coupled and connected to each other, and a waveguide line connected to the phase modulation module two in the optical waveguide chip one and a waveguide line connected to another incident port of the beam splitter two in the optical waveguide chip two are coupled and connected to each other.
As a further improved technical scheme of the present invention, the number of the optical waveguide chips is 2, and the optical waveguide chips are respectively an optical waveguide chip one and an optical waveguide chip two, the beam splitter one, the phase modulation module two and the beam splitter two are disposed in the optical waveguide chip one, the optical waveguide delay module and the beam combiner are disposed in the optical waveguide chip two, a waveguide line connected to an exit port of the beam splitter two in the optical waveguide chip one and a waveguide line connected to the optical waveguide delay module in the optical waveguide chip two are coupled and connected to each other, and a waveguide line connected to another exit port of the beam splitter two in the optical waveguide chip one and a waveguide line connected to an entrance port of the beam combiner in the optical waveguide chip two are coupled and connected to each other.
As a further improved technical solution of the present invention, the first beam splitter is used for splitting the optical pulse into two according to a ratio of 50:50, the first beam splitter adopts a Y-branch beam splitter, a DC beam splitter or an MMI beam splitter, and the Y-branch beam splitter is a Y-shaped waveguide beam splitter.
As a further improved technical scheme of the invention, the second beam splitter adopts a DC beam splitter or an MMI beam splitter.
As a further improved technical scheme of the invention, the optical waveguide delay module adopts a section of waveguide line.
As a further improved technical solution of the present invention, the beam combiner is configured to combine and output the optical pulse that passes through the optical waveguide delay module and the optical pulse that does not pass through the optical waveguide delay module, and the beam combiner uses a Y-branch beam combiner, a DC beam splitter, or an MMI beam splitter, and the Y-branch beam combiner is a Y-shaped waveguide beam combiner.
The invention has the beneficial effects that: the transmitting end coding module of the integrated time phase coding quantum key distribution system can complete the modulation work of four quantum states of time phase coding, thereby realizing various QKD protocol systems of time phase coding, including BB84 protocol, MDI protocol and the like.
Drawings
FIG. 1 is a diagram of four photon states for time phase encoding.
Fig. 2 is a schematic structural diagram of a first embodiment of the present invention.
FIG. 3 is a schematic diagram of an application method of the first embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a third embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to fig. 1 to 5:
the first embodiment is as follows: the embodiment provides a transmitting end coding module of an integrated time-phase coding quantum key distribution system (i.e. a transmitting end coding module of an optical integrated chip-based time-phase BB84 system), and a typical structure of the transmitting end coding module is shown in fig. 2. The method comprises the following steps: the optical waveguide coupler comprises a first optical waveguide coupler, a first phase modulation module, a second beam splitter, a second optical waveguide delay module and a beam combiner, wherein the first optical waveguide coupler, the first phase modulation module, the second beam splitter, the optical waveguide delay module and the beam combiner are integrated on the optical waveguide chip, the first optical waveguide coupler is connected with an incident port of the first beam splitter on the optical waveguide chip through a waveguide line, an emergent port of the first beam splitter is connected with the first phase modulation module through a waveguide line, the other emergent port of the first beam splitter is connected with the second phase modulation module through a waveguide line, the first phase modulation module is connected with an incident port of the second beam splitter through a waveguide line, the second phase modulation module is connected with the other incident port of the second beam splitter through a waveguide line, one emergent port of the second beam splitter is connected with one incident port of the beam combiner through a waveguide line on an upper arm, and the waveguide line is provided with the optical waveguide delay module, and the other exit port of the second beam splitter is connected with the other incident port of the beam combiner through a waveguide line of the lower arm, and the exit port of the beam combiner is connected with the second fiber waveguide coupler. The first optical fiber waveguide coupler is connected with a first optical fiber and used for coupling and connecting the first optical fiber with a waveguide line on the optical waveguide chip, and the second optical fiber waveguide coupler is connected with a second optical fiber and used for coupling and connecting the second optical fiber with the waveguide line on the optical waveguide chip. The first beam splitter, the first phase modulation module, the second beam splitter, the optical waveguide delay module, the beam combiner and each waveguide line of the embodiment are etched on the optical waveguide chip.
The first optical fiber is used for receiving incident optical pulses and coupling the received optical pulses into the optical waveguide chip through the first optical fiber waveguide coupler, the optical pulses are transmitted to the first beam splitter along a waveguide line in the optical waveguide chip, the first beam splitter divides the optical pulses into two optical pulses, one optical pulse enters the second beam splitter after passing through the first phase modulation module, the other optical pulse enters the second beam splitter after passing through the second phase modulation module, the two optical pulses are combined and interfered in the second beam splitter, the interference result is emitted from two exit ports of the second beam splitter, the optical pulses emitted from one exit port of the second beam splitter enter the beam combiner through the optical waveguide delay module on the waveguide line, the optical pulses emitted from the other exit port of the second beam splitter directly enter the beam combiner through the waveguide line, and the beam combiner outputs the optical pulses to the second optical fiber waveguide coupler after combining, the second fiber waveguide coupler emits the light pulse through a second optical fiber.
The meanings and meanings of the individual components in FIG. 2 are as follows:
(1) the first optical fiber waveguide coupler and the second optical fiber waveguide coupler have the same structure and are also called optical fiber chip end face coupling, and the purpose is to couple an optical fiber with a waveguide line on an optical waveguide chip and enable optical pulses to enter a chip waveguide.
(2) The first beam splitter is used for splitting the light pulse into two according to the proportion of 50: 50. A Y-branch splitter, i.e. a Y-shaped waveguide splitter, can be used here, but also a directly coupled splitter (DC splitter) or a multimode interferometer splitter (MMI splitter) can be used instead, with the same effect.
(3) The first phase modulation module and the second phase modulation module have the same structure and are used for rapidly modulating the phase of the optical pulse.
(4) A second beam splitter: a DC beam splitter, namely a 50:50 beam splitter, can be adopted, two beams of light pulses respectively passing through the first phase modulation module and the second phase modulation module are combined and interfered at the DC beam splitter, and the interference result is emitted from two emitting ports of the DC beam splitter. The DC splitter can here be replaced by an MMI splitter, which has the same effect.
(5) The optical waveguide delay module is used for time-delaying the optical pulse, is positioned on the upper arm in fig. 2, so that the optical pulse on the upper arm has a time difference relative to the optical pulse on the lower arm, and the module is generally a long-wave wire, so that the delay length is determined by the length of the waveguide wire.
(6) The beam combiner may adopt a DC splitter (also referred to as a DC beam combiner, a DC coupler), that is, a 50:50 splitter, which combines the pulse passing through the optical waveguide delay module and the pulse not passing through the optical waveguide delay module and outputs the combined pulse. The DC splitter can be replaced by a Y-branch combiner or MMI splitter (also called MMI combiner, MMI coupler) with the same effect. The Y-branch beam splitter is formed by connecting the Y-branch beam combiner in an inverted mode.
The first embodiment of the present invention is taken as an example, and the working principle of the on-chip time phase encoding module is described with reference to the time phase transmitting end system as shown in fig. 3. The time phase encoding module in fig. 3 is a transmitting end encoding module of the integrated time phase encoded quantum key distribution system of this embodiment.
(1) At the transmitting end, laser pulses are coupled into the optical waveguide chip through the end face of the optical fiber chip by the optical fiber.
(2) The optical pulse is divided into two beams of light in equal proportion at the first beam splitter, and the two beams of light are respectively modulated by the first phase modulation module and the second phase modulation module.
(3) And adjusting the phase difference of the first phase modulation module in the upper arm and the second phase modulation module in the lower arm so that the phase difference is 0, pi/2, pi and 3 pi/2 respectively. Then the light pulses on the upper arm and the lower arm interfere at the second beam splitter, and enter a rear structure according to the interference result.
(4) Specifically, if the phase difference is 0, all the light energy is output from the upper arm after interference, passes through the optical waveguide delay module, then passes through the beam combiner, and is output, at this time, corresponding to the state |0 in the Z-base>(ii) a If the phase difference is pi, all the light energy is output by the lower arm after interference and then output after passing through the beam combiner, and at the moment, the light energy corresponds to a state |1 in the Z base>(ii) a If the phase difference is pi/2, half of the light energy is output by the upper arm after interference, half of the light energy is output by the lower arm, and the phase difference of the upper arm light pulse and the lower arm light pulse is pi/2 at the moment, and then the light energy is output after passing through the beam combiner, so that the state corresponding to the Y base at the moment is output
If the phase difference is 3 pi/2, half of the light energy is output by the upper arm after interference, half of the light energy is output by the lower arm, and the phase difference of the upper arm light pulse and the lower arm light pulse is 3 pi/2 at the moment, and then the light energy is output after passing through a beam combiner and corresponds to the state under the Y base
(5) In summary, the structure proposed in this embodiment can implement modulation of four states in a time phase system. And then, the modulated light pulse enters an intensity modulation module, and the intensity modulation module randomly encodes three decoy states with different intensities according to the decoy state principle of the quantum key distribution system.
(6) And then, the optical pulse is attenuated to a single photon magnitude through optical attenuation and enters a channel.
(7) The optical pulse transmitted by the channel enters a receiving end to be received by the receiving end, and after measurement, the quantum key distribution is completed through post-processing algorithms such as base pairing, secret amplification and the like.
Example two: due to different optical waveguide chip materials, some optical waveguide chips are more suitable for being used as partial chips with high-speed phase modulation modules, such as lithium niobate materials. Some of the optical waveguide delay modules are suitable for being used as waveguide chips with optical waveguide delay modules, such as PLC material systems, and the like, due to the small bending radius. Therefore, waveguide chips made of two different materials can be integrated by a hybrid integration method at this time, so that the function of the time phase coding module is completed. As shown in fig. 4, in this example, the first phase modulation module and the second phase modulation module are located on the first waveguide chip, while the DC splitter, the optical waveguide delay module, and the DC combiner are located on the second waveguide chip, and the first waveguide chip and the second waveguide chip are connected by chip-to-chip optical waveguide coupling. The first beam splitter can adopt a Y-branch beam splitter, a DC beam splitter or an MMI beam splitter; the second beam splitter can adopt a DC beam splitter or an MMI beam splitter; the optical waveguide delay module adopts a section of waveguide line; the beam combiner can adopt a Y-branch beam combiner, a DC beam splitter or an MMI beam splitter; the function is the same as in example 1.
The structure of the second embodiment is specifically described below:
a transmitting end coding module of an integrated time phase coding quantum key distribution system comprises a first optical waveguide coupler, a first optical waveguide chip, a second optical waveguide chip and a second optical waveguide coupler, wherein a first beam splitter, a first phase modulation module and a second phase modulation module are arranged in the first optical waveguide chip; the first optical fiber waveguide coupler is connected with an incident port of a first beam splitter on the first optical waveguide chip through a waveguide line, an emergent port of the first beam splitter is connected with a first phase modulation module through the waveguide line, and the other emergent port of the first beam splitter is connected with a second phase modulation module through the waveguide line; and an exit port of the second beam splitter is connected with an entrance port of the beam combiner through a waveguide line of the upper arm, an optical waveguide delay module is arranged on the waveguide line, the other exit port of the second beam splitter is connected with the other entrance port of the beam combiner through a waveguide line of the lower arm, and the exit port of the beam combiner is connected with the second optical fiber waveguide coupler. The first optical fiber waveguide coupler is connected with a first optical fiber and used for coupling and connecting the first optical fiber with a waveguide line on the first optical waveguide chip, and the second optical fiber waveguide coupler is connected with a second optical fiber and used for coupling and connecting the second optical fiber with a waveguide line on the second optical waveguide chip.
The first optical fiber is used for receiving incident optical pulses and coupling the received optical pulses into the first optical waveguide chip through the first optical fiber waveguide coupler, the optical pulses are transmitted to the first beam splitter along a waveguide line in the first optical waveguide chip, the first beam splitter divides the optical pulses into two optical pulses, one optical pulse enters the second beam splitter in the second optical waveguide chip after passing through the first phase modulation module and the waveguide line, the other optical pulse enters the second beam splitter in the second optical waveguide chip after passing through the second phase modulation module and the waveguide line, the two optical pulses are combined and interfered in the second beam splitter, interference results are emitted from two exit ports of the second beam splitter, the optical pulses emitted from one exit port of the second beam splitter enter the beam combiner through the optical waveguide delay module on the upper arm waveguide line, and the optical pulses emitted from the other exit port of the second beam splitter enter the beam combiner through the lower arm waveguide line, the beam combiner outputs the combined light pulse to the second optical fiber waveguide coupler, and the second optical fiber waveguide coupler emits the light pulse through the second optical fiber.
The application method of this embodiment is the same as that of the embodiment in fig. 3.
Example three: the third embodiment has a similar structure to the second embodiment, except that the two beam splitters are located on the first waveguide chip, and the functions and device descriptions thereof are the same as those of the first embodiment, as shown in fig. 5. The application method of this embodiment is the same as that of the embodiment in fig. 3.
The transmitting end coding module of the integrated time phase coding quantum key distribution system can complete the modulation work of four quantum states of time phase coding, thereby realizing various QKD protocol systems of time phase coding, including BB84 protocol, MDI protocol and the like.
The scope of the present invention includes, but is not limited to, the above embodiments, and the present invention is defined by the appended claims, and any alterations, modifications, and improvements that may occur to those skilled in the art are all within the scope of the present invention.
Claims (7)
1. A transmitting end coding module of an integrated time phase coding quantum key distribution system is characterized by comprising a first optical fiber waveguide coupler, an optical waveguide chip and a second optical fiber waveguide coupler, wherein a first beam splitter, a first phase modulation module, a second beam splitter, an optical waveguide delay module and a beam combiner are integrated on the optical waveguide chip, the first optical fiber waveguide coupler is connected with an incident port of the first beam splitter on the optical waveguide chip through a waveguide line, an emergent port of the first beam splitter is connected with the first phase modulation module through a waveguide line, the other emergent port of the first beam splitter is connected with the second phase modulation module through a waveguide line, the first phase modulation module is connected with an incident port of the second beam splitter through a waveguide line, and the second phase modulation module is connected with the other incident port of the second beam splitter through a waveguide line, an exit port of the second beam splitter is connected with an incident port of the beam combiner through a waveguide line, an optical waveguide delay module is arranged on the waveguide line, the other exit port of the second beam splitter is connected with the other incident port of the beam combiner through the waveguide line, and the exit port of the beam combiner is connected with the second optical fiber waveguide coupler;
the first optical fiber waveguide coupler is connected with a first optical fiber and used for coupling and connecting the first optical fiber with a waveguide line on the optical waveguide chip, and the second optical fiber waveguide coupler is connected with a second optical fiber and used for coupling and connecting the second optical fiber with the waveguide line on the optical waveguide chip;
the first optical fiber is used for receiving the incident optical pulse and coupling the received optical pulse into the optical waveguide chip through the first optical fiber waveguide coupler, the optical pulse is transmitted to the first beam splitter along a waveguide line in the optical waveguide chip, the first beam splitter divides the optical pulse into two beams of optical pulses, one beam of optical pulse enters the second beam splitter after passing through the first phase modulation module, the other beam of optical pulse enters the second beam splitter after passing through the second phase modulation module, the two beams of optical pulses are combined and interfered in the second beam splitter, an interference result is emitted from two emitting ports of the second beam splitter, the optical pulse emitted from one emitting port of the second beam splitter enters the beam combiner through the optical waveguide delay module on the waveguide line, the optical pulse emitted from the other emitting port of the second beam splitter enters the beam combiner through the waveguide line, the beam combiner combines the optical pulses and outputs the combined optical pulse to the second optical fiber waveguide coupler, and the second optical fiber waveguide coupler emits the optical pulse through the second optical fiber.
2. The transmit-side encoding module of the integrated time-phase encoded quantum key distribution system according to claim 1, wherein the number of the optical waveguide chips is 2, and the optical waveguide chip is a first optical waveguide chip and a second optical waveguide chip, the first splitter, the first phase modulation module, and the second phase modulation module are disposed in the first optical waveguide chip, the second splitter, the second optical waveguide delay module, and the combiner are disposed in the second optical waveguide chip, the waveguide line connected to the first phase modulation module in the first optical waveguide chip is coupled to the waveguide line connected to the first incident port of the second splitter in the second optical waveguide chip, and the waveguide line connected to the second phase modulation module in the first optical waveguide chip is coupled to the waveguide line connected to the other incident port of the second splitter in the second optical waveguide chip.
3. The transmit-side encoding module of the integrated time-phase encoded quantum key distribution system according to claim 1, wherein there are 2 optical waveguide chips, which are the first optical waveguide chip and the second optical waveguide chip, respectively, the first beam splitter, the first phase modulation module, the second phase modulation module, and the second beam splitter are disposed in the first optical waveguide chip, the optical waveguide delay module and the beam combiner are disposed in the second optical waveguide chip, a waveguide line connected to an exit port of the second beam splitter in the first optical waveguide chip is coupled to a waveguide line connected to the optical waveguide delay module in the second optical waveguide chip, and a waveguide line connected to another exit port of the second beam splitter in the first optical waveguide chip is coupled to a waveguide line connected to an entrance port of the second beam combiner in the second optical waveguide chip.
4. The transmit-side encoding module of an integrated time-phase encoded quantum key distribution system according to any of claims 1 to 3, wherein the first beam splitter is used to split the light pulse into two parts according to a ratio of 50:50, and the first beam splitter is a Y-branch beam splitter, a direct-coupling DC beam splitter or a multi-mode interferometer MMI beam splitter, and the Y-branch beam splitter is a Y-shaped waveguide beam splitter.
5. The transmit-side encoding module of the integrated time-phase encoded quantum key distribution system according to any of claims 1 to 3, wherein the second splitter is a direct-coupling DC splitter or a multi-mode interferometer MMI splitter.
6. The transmit-side encoding module of an integrated time-phase encoded quantum key distribution system according to any of claims 1 to 3, wherein the optical waveguide delay module employs a length of waveguide line.
7. The transmit-side encoding module of the integrated time-phase encoded quantum key distribution system according to any one of claims 1 to 3, wherein the combiner is configured to combine and output the optical pulse passing through the optical waveguide delay module and the optical pulse not passing through the optical waveguide delay module, and the combiner employs a Y-branch combiner, a direct-coupling DC splitter, or a multi-mode interferometer MMI splitter, and the Y-branch combiner is a Y-shaped waveguide combiner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910587489.XA CN110149208B (en) | 2019-07-02 | 2019-07-02 | Transmitting end coding module of integrated time phase coding quantum key distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910587489.XA CN110149208B (en) | 2019-07-02 | 2019-07-02 | Transmitting end coding module of integrated time phase coding quantum key distribution system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110149208A CN110149208A (en) | 2019-08-20 |
| CN110149208B true CN110149208B (en) | 2021-11-09 |
Family
ID=67596813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910587489.XA Active CN110149208B (en) | 2019-07-02 | 2019-07-02 | Transmitting end coding module of integrated time phase coding quantum key distribution system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110149208B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115801254B (en) * | 2023-02-07 | 2023-04-18 | 合肥硅臻芯片技术有限公司 | Quantum key distribution method, transmitting terminal and quantum key distribution system |
| CN115801255B (en) * | 2023-02-08 | 2023-04-07 | 合肥硅臻芯片技术有限公司 | Quantum key distribution method, transmitting terminal and quantum key distribution system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108933663A (en) * | 2017-05-26 | 2018-12-04 | 科大国盾量子技术股份有限公司 | The quantum key distribution system and its component of time phase coding |
| CN108809432A (en) * | 2018-09-11 | 2018-11-13 | 安徽问天量子科技股份有限公司 | Time phase quantum key dispatching system transmitting terminal coding module and state preparation method |
-
2019
- 2019-07-02 CN CN201910587489.XA patent/CN110149208B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110149208A (en) | 2019-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110620652B (en) | Quantum key distribution system and communication method thereof | |
| US9791761B1 (en) | Integrated chip | |
| CN103502859B (en) | Multichannel light emitting devices and production and preparation method thereof | |
| US11329730B2 (en) | Quantum communication system having time to frequency conversion and associated methods | |
| CN110149208B (en) | Transmitting end coding module of integrated time phase coding quantum key distribution system | |
| CN103091782B (en) | Array waveguide grating module with polarization control | |
| WO2021188045A1 (en) | System and apparatuses for measurement-device-independent quantum key distribution | |
| CN107370541A (en) | Frequency-tunable is without local oscillator phase-coded signal optics generation device and method | |
| CN108933663A (en) | The quantum key distribution system and its component of time phase coding | |
| CN110324144B (en) | Quantum key distribution transmitting end chip, packaging structure and device | |
| Zhang et al. | Polarization-based quantum key distribution encoder and decoder on silicon photonics | |
| US10230486B2 (en) | Optical transceiver with common end module | |
| CN210380876U (en) | Quantum key distribution transmitting terminal chip, packaging structure and equipment | |
| CN114006693A (en) | Polarization coding QKD system and method based on silicon optical integrated chip | |
| CN106464384B (en) | A kind of signal modulation device of optical and system | |
| CN110278036A (en) | Digital coherent transceiver, data transmission method and device applied to data center | |
| CN115801254A (en) | Quantum key distribution method, transmitting terminal and quantum key distribution system | |
| CN215222212U (en) | Quantum key distribution optical chip based on time phase coding | |
| CN214429544U (en) | Quantum key distribution system based on wavelength modulation | |
| CN110224826B (en) | Passive compensation interferometer for on-chip polarization change and quantum key distribution system | |
| CN110266491B (en) | Quantum key distribution receiving end chip and device | |
| CN210112020U (en) | Anti-polarization-disturbance phase coding quantum key distribution system | |
| CN112688778A (en) | Phase encoding quantum key distribution system | |
| CN207460200U (en) | A kind of quantum key dispatching system based on Waveguide interference ring | |
| RU80637U1 (en) | INTEGRAL OPTICAL SWITCH FOR PHASE CODING QUANTUM CRYPTOGRAPHY SYSTEMS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |