CN108599869A - Polarization Coding quantum communications terminal chip and its application - Google Patents
Polarization Coding quantum communications terminal chip and its application Download PDFInfo
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- CN108599869A CN108599869A CN201810631658.0A CN201810631658A CN108599869A CN 108599869 A CN108599869 A CN 108599869A CN 201810631658 A CN201810631658 A CN 201810631658A CN 108599869 A CN108599869 A CN 108599869A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/532—Polarisation modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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Abstract
A kind of Polarization Coding quantum communications terminal chip and its application, including：It is set to polarization independent beam splitting device, polarization beam splitter and the on piece integrated detector being connected in substrate, wherein：One end of polarization independent beam splitting device is equipped with the opening of the light quantum bit for receiving arbitrary Polarization Coding in an end face of the quantum communications terminal chip, the other end is connected with the input arm of polarization beam splitter respectively, the output arm of polarization beam splitter is connected with each on piece integrated detector respectively, to measure light quantity subsignal.The present invention directly can carry out projection measurement compared with low error rate to the quantum key of arbitrary Polarization Coding, have the advantages that small, light-weight, low energy consumption, precision is high, stability is strong, expansible space is big, manufacturing cost and period, the operating comfort for increasing receiving terminal are greatly reduced simultaneously, it is most competitive one of the embodiment of development remote practical quantum communication system steady in a long-term, is suitable for a wide range of promote and apply.
Description
Technical field
The present invention relates to a kind of technologies of femtosecond laser processing and quantum communications field, and in particular to a kind of available
The quantum communications terminal chip and its manufacturing method that photon polarization degree of freedom is directly encoded.
Background technology
In the quantum secret communication experiment that the sub- optical instrument of standing crop is realized, in a manner of photon polarization degree of freedom coding with
The features such as its natural stability and power equalization are widely used, and the quantum communications that many functionizations are implemented at a distance such as lure
It deceives state quantum key distribution etc. and Polarization Coding can be used.However the optical quantum system built of macroscopical optical device due to size compared with
Greatly, insertion loss is big and is easily influenced by environment such as temperature, air-flow and vibration, and the further of light quantum information processing is limited
Extension.In addition, current existing quantum communications serial experiment polarization mode caused by being limited to material based on silicon base chip
The technical problems such as dispersion cannot achieve the polarization degree of freedom directly to quantum bit and be coded and decoded and need actively to adjust
System.
Invention content
The present invention is for the connection error in existing quantum communications implementation system macroscopic view light path, insertion loss, interface noise
It is big and existing based on waveguide series of problems caused by birefringence in silicon base chip, propose that a kind of Polarization Coding quantum communications are whole
Hold chip and its application, which has that the optical polarization independent beam splitting ratio of full integrated chip is controllable, pole
Change the passive structures and on piece detecting structure of beam splitting function, quantum key that can be compared with low error rate directly to arbitrary Polarization Coding
Projection measurement is carried out, has the advantages that small, light-weight, low energy consumption, precision is high, stability is strong, expansible space is big, simultaneously
Manufacturing cost and period, the operating comfort for increasing receiving terminal are greatly reduced, is development remote functionization steady in a long-term
Most competitive one of the embodiment of quantum communication system is suitable for a wide range of promote and apply.
The present invention is achieved by the following technical solutions：
The present invention relates to a kind of Polarization Coding quantum communications terminal chips, including：It is set to the polarization nothing being connected in substrate
Beam splitter, polarization beam splitter and on piece integrated detector are closed, wherein：One end of polarization independent beam splitting device is in the quantum communications
One end face of terminal chip is equipped with the opening of light quantum bit for receiving arbitrary Polarization Coding, the other end respectively with polarization
The input arm of beam splitter is connected, and the output arm of polarization beam splitter is connected with each on piece integrated detector respectively, to measure light quantity
Subsignal.
The Polarization Coding quantum communications terminal chip includes any one following structure：
I. a polarization independent beam splitting device, two horizontal polarization beam splitters and four on piece integrated detectors；
Ii. a polarization independent beam splitting device, a horizontal polarization beam splitter, inclined light shaft polarization beam splitter with
And four on piece integrated detectors；
Iii. a polarization independent beam splitting device, a half-wave plate, two horizontal polarization beam splitters and four on piece collection
At detector；
Iv. the polarization beam splitter and four on piece integrated detectors of a polarization independent beam splitting device, two inclined light shafts；
V. a polarization independent beam splitting device, two wave plates, two horizontal polarization beam splitters and the integrated spy of four on pieces
Survey device.
The structure of the polarization independent beam splitting device is realized using any one following mode：
1. one or two concatenated X-coupler；
2. a coupling regime is in inclination angle and disjoint directional coupler, i.e. directional inclination coupler；
3. an optical axis coincidence orients horizontal coupler in the non-intersecting directional coupler of plane of chip normal.
The polarization beam splitter includes：Two with birefringence and in the disjoint waveguide composition of coupling regime
Directional coupler, wherein：A piece input arm of directional coupler is directly connected simultaneously with an output arm of polarization independent beam splitting device
Receive the light quantum bit of arbitrary Polarization Coding.
The polarization beam splitter of the inclined light shaft includes：Two inclined light shafts and have with horizontal plane and inclined light shaft
Angle identical or complementary clinoplain carries out the directional coupler that the waveguide of non-intersecting coupling is constituted, wherein directional coupler
A piece input arm is directly connected with an output arm of polarization independent beam splitting device and receives the light quantum bit of arbitrary Polarization Coding.
The inclined light shaft of the polarization beam splitter of the inclined light shaft is 45 ° of inclinations angle.
The optical axis of the half-wave plate and wave plate has and the matched inclination angle of polarization beam splitter.
The inclination angle uses but is not limited to femtosecond laser to be repeatedly able to reality at a distance of certain angle and compartment of terrain direct write
It is existing.
The on piece integrated detector realizes that the input terminal of the superconducting nano-wire is with evanescent wave coupling using superconducting nano-wire
The form of conjunction is connected with the output arm of polarization beam splitter realizes the input of signal.
The linking, by be directly connected to or by evanescent wave couple in the form of realize.
The coupling, it is different birefringence-compensated to realize by adjusting different cross-couplings spacing, by adjusting not
With parallel coupling spacing to realize the controllable beam splitting of ratio.
The on piece integrated detector be superconducting nano-wire, using but be not limited to niobium nitride realize.
The opening of the light quantum bit for receiving arbitrary Polarization Coding converts by adjusting laser thermal insulation to be adjusted
Waveguide sections size or by thermal expansion process makes the mode field diameter of coupling optical fiber more be matched with waveguide realize it is low with optical fiber
Loss linking.
The present invention relates to a kind of Polarization Coding quantum communications terminal chip arrays, including at least two above-mentioned Polarization Coding amounts
Sub- communication terminal chip.
The substrate, use but be not limited to transparent borosilicate glass, fused silica glass etc..
The present invention relates to the applications of above-mentioned Polarization Coding quantum communications terminal chip, directly polarize certainly to photon for receiving
By the arbitrary light quantum bit of degree coding.
Technique effect
Compared with prior art, Polarization Coding quantum communications terminal chip of the present invention realizes the miniature of quantum communications terminal
Change, passive and array reduce terminal use while improving system stability, reducing system loss and manufacturing cost
The complexity of family operation, is suitable for the large-scale application of quantum communication network.Manufacturing process of the present invention is established straight in ultrafast laser
It writes on manufacturing technology basis, the unrelated ratio beam splitting of polarization, waveguide optical axis any angle is realized by the change of direct write structure
Regulation and control, the multiple device low-losses of on piece are integrated, while converting adjustment waveguide sections size by adjusting laser thermal insulation or passing through heat
Expansion process makes the mode field diameter of coupling optical fiber more be matched with waveguide and realize that the low-loss with optical fiber is connected, and the chip is made both may be used
Optical signal directly with free space input carries out efficient coupling, and can be connected by v-groove, to the letter inputted in optical fiber
It number measures, and the different-wavebands such as 780nm, 810nm, 1550nm is applicable in, 50% or more coupling efficiency has filled up pole
Change the lower free space of coding, optical fiber and the direct-coupled technology vacancy of chip, can finally realize with compared with low error rate to arbitrary pole
The quantum key for changing coding carries out projection measurement.
Description of the drawings
Fig. 1 is polarization independent beam splitting device schematic diagram；
In figure：A, b, c are followed successively by two coupler series connection, directional inclination coupler, orientation three kinds of structures of horizontal coupler
Vertical view, left view and front view；
Fig. 2 is unrelated (the Measurement Device Independent) quantum key distribution of 1 measuring apparatus of embodiment
Terminal chip schematic diagram；
Fig. 3 is 1 effect diagram of embodiment；
Fig. 4 is the state distribution map under the different basic vectors of embodiment 1；
In figure：A is HV basic vectors；B is AD basic vectors.
Fig. 5 is the quantum key distribution terminal that embodiment 2 is suitable for BB84 agreements, E91 agreements, trick state Polarization Coding etc.
Chip schematic diagram；
Fig. 6 is the quantum key distribution terminal that embodiment 2 is suitable for BB84 agreements, E91 agreements, trick state Polarization Coding etc.
Chip schematic diagram；
Fig. 7 is 2 effect diagram of embodiment；
Fig. 8 a~c are Bell's state in the unrelated quantum key distribution of measuring apparatus, quantum teleportation point of embodiment 3
Analyse three kinds of structural schematic diagrams of projection chip；
Fig. 9 is tilted optical axis direct write schematic diagram；
In figure：A is level, b is 22.5 degree of inclination, c is to tilt 45 degree；
Figure 10 is tilted optical axis and waveguide angled relationships schematic diagram；
In figure：The integrated detection of independent beam splitting device 1, first wave guide 101, second waveguide 102, polarization beam splitter 2, the on piece of polarizing
Device 3, wave plate 4, the first input port In1, the second input port In2.
Specific implementation mode
Embodiment 1
The present embodiment is related to a kind of Polarization Coding quantum communications terminal chip and its unrelated in measuring apparatus
The application of (Measurement Device Independent) quantum key distribution.
The present embodiment chip is by ultrafast laser write-through system of processing, and the chip material used is transparent material (such as boron
Silicate glass, fused silica glass etc.) it is prepared.
As shown in Fig. 2, the present embodiment chip includes：One polarization independent beam splitting device 1, two optical axises in parallel therewith are identical
Polarization beam splitter 201,202 and four on piece detectors 3.
The polarization independent beam splitting device 1 uses any one structure in Fig. 1 a~Fig. 1 c, wherein：
As shown in Figure 1a, which includes：Two waveguides 101,102 for carrying birefringence,
It is separated after carrying out cross-couplings and parallel coupling in same level, wherein：The width in the region of parallel coupling is 2~50 μm.
As shown in Figure 1 b, which includes：Two waveguides 101,102 for carrying birefringence,
It is separated after carrying out parallel coupling on different horizontal planes, wherein：The width in the region of parallel coupling is 2~50 μm.
As illustrated in figure 1 c, which includes：Two waveguides 101,102 for carrying birefringence,
It carries out separating after only carrying out parallel coupling in same level, wherein：2~50 μm of the width in the region of parallel coupling.
The present embodiment uses said chip to carry out Bell's state projection measurement, specific steps packet for third party (Charlie)
It includes：The quantum state (the light quantity subsignal encoded) that legal communicating pair (Alice and Bob) can be prepared them is with free sky
Between or fiber coupling mode respectively from Fig. 2 the first input port In1 and the second input port In2 send third party to
(Charlie) (chip is inputted).
Preferably, third party (Charlie) first passes through the polarization state of some additional polarization compensation calibration photons in advance, makes it
It is evenly distributed in the surface of Poincare sphere.
The polarization independent beam splitting device 1 by signal that Alice and Bob are sent uniformly and can not differentiate (wavelength, when
Between, polarization property etc.) be input to the polarization projection separation that the first and second polarization beam splitters 201,202 carry out orthogonal basic vector, with
It afterwards couples the light quantity subsignal for having carried out the projection of Bell's state to and is integrated in the on piece integrated detector of chip end and detects,
And the result of Bell's state projection measurement is exported.
Chip in the present embodiment is preferably further provided at the digital signal being connected with the on piece integrated detector
Module is managed to carry out coincidence measurement.
As shown in figure 3, communicating pair (Alice and Bob) by digital signal processing module look for delay etc. it is complete with
Photon, hereafter, transmitting terminal (Alice) and receiving terminal (Bob) can be carried out according to the result of Charlie projection measurements and coincidence counting
Corresponding bit reversal operation is compared and carried out, corresponding respective key is obtained；And third party's receiving terminal (Charlie) is due to only
Possess the result of Bell's state projection measurement and specific key information can not be obtained.
As shown in figures 4 a and 4b, it is the communicating pair Alice and Bob differences symbol of the unrelated quantum key distribution of measuring apparatus
The Relative distribution of total number, the ADHV in icon are respectively Polarization Coding basic vector, the 1234 subscripts difference that communicating pair uses
The output of corresponding four detectors 1234, AA are that A, A polarization basic vector progress light quantum coding is respectively adopted in Alice and Bob.
Embodiment 2
The present embodiment be related to a kind of Polarization Coding quantum communications terminal chip in BB84 agreements, E91 agreements, inveigle state polarization
The application of the quantum key distribution of coding etc..
The present embodiment chip uses any one structure in Fig. 5 or Fig. 6 to be achieved：
As shown in figure 5, the chip includes：The polarization point of one polarization independent beam splitting 1, two 45 ° of orthogonal optical axis included angle of device
Beam device 201,202 and four on piece detectors 3.
First polarization beam splitter 201 is prepared using Fig. 9 a direct writing means, and the second polarization beam splitter 202 uses
Fig. 9 b direct writing means are prepared.
As illustrated in fig. 9, it is the schematic cross-section of femtosecond laser direct write processing waveguide conventional machining process, according to such side
The waveguide optical axis that method is write out is vertically or horizontally (parallel or vertically the direction with direct write light beam).Fig. 9 b and Fig. 9 c are direct-write methods
Schematic cross-section, which can obtain the inclined waveguide of optical axis any angle.
The femtosecond laser direct write is processed as using multiple direct write, i.e., in waveguide (such as Fig. 9 b O1 of original single direct write
It is other), distance away with angle with piece waveguide of direct write (such as Fig. 9 b O2) again of identical or slightly different parameter, with reality
The now effect of whole inclined light shaft, wherein：Multiple direct write number is not limited to 2 times.
The distance is adjusted accordingly, preferably 0.1~5 μm according to the of different sizes of waveguide diameter
The angle is as shown in Figure 10.
As shown in fig. 6, the chip includes：One polarization independent beam splitting device 1, the identical polarization beam splitter 201 of two optical axises,
202, an on piece half-wave plate 4 and four on piece detectors 3, wherein：The optical axis of first and second polarization beam splitters 201,202
It is horizontally disposed.
The present embodiment is using the Polarization Coding quantum communications terminal chip of said chip in BB84 agreements, E91 agreements, trick
The quantum key distribution of state Polarization Coding etc. or for BB84 agreements, E91 agreements, the quantum key point for inveigling state Polarization Coding etc.
Hair, specific steps include：
1. said chip is set to the receiving terminal (Bob) of direct communication or is set to the transmission using passive sending method
It holds (Alice).
2. the light quantity subsignal that legal communicating pair (Alice and Bob) is encoded is with free space or fiber coupling
Mode input respective terminal chip.
3. light quantity subsignal is randomly input to the first polarization beam splitter 201 by first polarization independent beam splitting device of chip
It is thrown with the polarization for inputting 202 polarization beam splitter of the second polarization beam splitter after half-wave plate 4 and carrying out different orthogonal basic vector (HV ,+-)
Shadow, then by the result that different basic vectors project be coupled on piece detector and carry out output detection obtain primary key.
4. communicating pair can compare basic vector using overt channel and carry out testing keys, meet the bit of error rate test requirement
String is the shared key of transmission.
It is illustrated in figure 7 under different Polarization Coding input conditions, detects the comparison of gained simultaneously by HV, AD difference basic vector
Block diagram.
Embodiment 3
The present embodiment is related to a kind of Polarization Coding quantum communications terminal chip and its in the unrelated quantum key of measuring apparatus point
The application of Bell's state analysis in hair, quantum teleportation.
The present embodiment chip uses any one structure in Fig. 8 to be achieved：
The chip uses chip structure as described in example 1 above, or uses：
Polarization of 1, two optical axis of polarization beam splitter of an optical axis level as shown in Figure 4 horizontal by 45 ° of angles
Beam splitter 201,202, four on piece detectors 3, or use：
Polarization beam splitter 201,202, two pieces of 1, two optical axis level of partial polarization beam splitter of one optical axis level
The structure of upper half-wave plate 4 and four on piece detectors 3.
The present embodiment is related to said chip in Polarization Coding quantum communications terminal chip and its in the unrelated quantum of measuring apparatus
Key distribution, Bell's state analysis of quantum teleportation, specific steps include：Said chip is set to transmitting terminal
(Alice) Bell states analysis is carried out, two polarization beam splitters 201,202 of the chip first passed around will be located at communication pair
Entangled photons signal reconstruction at side (Alice and Bob) two is superposition state, and two subsequent polarization beam splitters will carry out polarization throwing
Shadow measures, and couple light quantity subsignal to be integrated in chip end superconductor detector carry out meeting detection it is different to distinguish
Bell's state.After Entangled State is determined, transmitting terminal (Alice) can be communicated by classical channel with receiving terminal (Bob), its basis is made
Measurement result does corresponding unitary transformation, you can the key transmitted.
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the principle of the invention and objective with difference
Mode carry out local directed complete set to it, protection scope of the present invention is subject to claims and not by above-mentioned specific implementation institute
Limit, each implementation within its scope is by the constraint of the present invention.
Claims (15)
1. a kind of Polarization Coding quantum communications terminal chip, which is characterized in that including：It is unrelated to be set to the polarization being connected in substrate
Beam splitter, polarization beam splitter and on piece integrated detector, wherein：One end of polarization independent beam splitting device is at quantum communications end
An end face of chip is held to be equipped with the opening of the light quantum bit for receiving arbitrary Polarization Coding, the other end divides with polarization respectively
The input arm of beam device is connected, and the output arm of polarization beam splitter is connected with each on piece integrated detector respectively, to measure light quantum
Signal.
2. Polarization Coding quantum communications terminal chip according to claim 1, characterized in that the Polarization Coding quantum
Communication terminal chip includes any one following structure：
I. a polarization independent beam splitting device, two horizontal polarization beam splitters and four on piece integrated detectors；
Ii. the polarization beam splitter and four of a polarization independent beam splitting device, a horizontal polarization beam splitter, inclined light shaft
A on piece integrated detector；
Iii. a polarization independent beam splitting device, a half-wave plate, two horizontal polarization beam splitters and the integrated spy of four on pieces
Survey device；
Iv. the polarization beam splitter and four on piece integrated detectors of a polarization independent beam splitting device, two inclined light shafts；
V. a polarization independent beam splitting device, two wave plates, two horizontal polarization beam splitters and four on piece integrated detectors.
3. Polarization Coding quantum communications terminal chip according to claim 1, characterized in that the polarization independent beam splitting
The structure of device is realized using any one following mode：
1. one or two concatenated cross couplings；
2. a coupling regime is in inclination angle and disjoint directional coupler, i.e. directional inclination coupler；
3. an optical axis coincidence orients horizontal coupler in the non-intersecting directional coupler of plane of chip normal.
4. Polarization Coding quantum communications terminal chip according to claim 2, characterized in that the polarization beam splitter packet
It includes：Two directional couplers for carrying birefringence and being constituted in the disjoint waveguide of coupling regime, wherein：Directional coupler
An input arm be directly connected with an output arm of polarization independent beam splitting device and receive the light quantum ratio of arbitrary Polarization Coding
It is special；
The polarization beam splitter of the inclined light shaft includes：Two inclined light shafts and with horizontal plane have and inclined light shaft angle
Identical or complementary clinoplain carries out the directional coupler that the waveguide of non-intersecting coupling is constituted, wherein the one of directional coupler piece
Input arm is directly connected with an output arm of polarization independent beam splitting device and receives the light quantum bit of arbitrary Polarization Coding.
5. Polarization Coding quantum communications terminal chip according to claim 2 or 4, characterized in that the inclined light shaft
For 45 ° of inclinations angle, the optical axis of half-wave plate and wave plate has and the matched inclination angle of polarization beam splitter (such as 22.5 °).
6. Polarization Coding quantum communications terminal chip according to claim 5, characterized in that the inclination angle is using winged
Second laser at a distance of certain angle and compartment of terrain direct write to be repeatedly achieved.
7. Polarization Coding quantum communications terminal chip according to claim 1 or 2, characterized in that the on piece is integrated
Detector is realized using superconducting nano-wire.
8. Polarization Coding quantum communications terminal chip according to claim 1, characterized in that the linking, by straight
It connects or is realized in the form of evanescent wave couples in succession.
9. the Polarization Coding quantum communications terminal chip according to claim 3 or 4 or 8, characterized in that the coupling,
It is different birefringence-compensated to realize by adjusting different cross-couplings spacing, by adjusting different parallel coupling spacing to realize
The controllable beam splitting of ratio.
10. Polarization Coding quantum communications terminal chip according to claim 1, characterized in that described appoints for receiving
The opening of the light quantum bit for Polarization Coding of anticipating converts adjustment waveguide sections size by adjusting laser thermal insulation or passes through thermal expansion
Process makes the mode field diameter of coupling optical fiber more be matched with waveguide and realize the low-loss with optical fiber and be connected.
11. a kind of Polarization Coding quantum communications terminal chip array, which is characterized in that wanted including at least two any of the above-described rights
Seek the Polarization Coding quantum communications terminal chip.
12. a kind of application based on Polarization Coding quantum communications terminal chip described in any of the above-described claim, which is characterized in that
For receiving the arbitrary light quantum bit directly to photon polarization degree of freedom coding.
13. application according to claim 12, characterized in that the application refers to：Said chip is used to be surveyed
Bell's state projection measurement that device-independent quantum key distribution terminal third party uses is measured, specific steps include：Legal
The light quantity subsignal that communicating pair is encoded is in a manner of free space or fiber coupling respectively from the first input port and second
Input port sends third party to, and communicating pair can be compared and carry out with the result of coincidence counting according to third party's projection measurement
Corresponding bit reversal operation, obtains corresponding respective key；And result of the third party due to only possessing Bell's state projection measurement
And specific key information can not be obtained.
14. application according to claim 12, characterized in that the application refers to：It is compiled using the polarization of the chip
The sub- communication terminal chip of code amount is in the quantum key distribution of BB84 agreements, E91 agreements, trick state Polarization Coding etc., specific step
Suddenly include：
1. said chip is set to the receiving terminal of direct communication or is set to the transmitting terminal using passive sending method；
2. the light quantity subsignal that legal communicating pair is encoded is inputted respective in a manner of free space or fiber coupling
Terminal chip；
3. light quantity subsignal is randomly input to the first and second polarization beam splitters by first polarization independent beam splitting device of chip
The polarization projection for carrying out different orthogonal basic vector (HV ,+-), then couples the result that different basic vectors project on piece detector simultaneously
It carries out output detection and obtains primary key；
4. communicating pair compares basic vector using overt channel and carries out testing keys, the Bit String for meeting error rate test requirement is
The shared key of transmission.
15. application according to claim 12, characterized in that the application refers to：The chip is set to transmission
End carries out Bell states analysis, and first polarization beam splitter of the chip is by the entangled photons signal at communicating pair two
It is reconstructed into superposition state, two subsequent polarization beam splitters will carry out polarization projection measurement, and couple light quantity subsignal to integrated
Superconductor detector in chip end meet detection to distinguish different Bell's states；After Entangled State is determined, transmitting terminal
It is communicated with receiving terminal by classical channel, it is made to do corresponding unitary transformation according to measurement result, you can the key transmitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810631658.0A CN108599869A (en) | 2018-06-19 | 2018-06-19 | Polarization Coding quantum communications terminal chip and its application |
Applications Claiming Priority (1)
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