CN207625570U - A kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus - Google Patents
A kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus Download PDFInfo
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Abstract
The utility model discloses a kind of automatic synchronizing apparatuses of the unrelated quantum key distribution system of measuring apparatus, including synchronization unit, multiple quantum terminal units, Quantum repeater unit and transmission unit.Isochronous controller exports a pulse and is divided into two-way, the starting end of time-to-amplitude conversion instrument is inputted all the way, triggering synchronous laser sends the synchronization light pulse of 1310nm all the way, quantum terminal unit is reached through transmission unit, signal pulse is sent out by delay and running chip drives 1550nm lasers and returns to quantum relay unit, electric impulse signal is converted to by photodetector, inputs the end of time-to-amplitude conversion instrument.Time delay between time-to-amplitude conversion instrument starting end and end trigger pulse is the flight time of signal in a link.Time delay in the unrelated quantum key distribution system of the utility model energy automatic real-time measurement equipment between each quantum terminal unit, and it carries out stablizing effective compensation, independent of large scale equipment such as OTDR etc., without extras, used element mature and reliable is conducive to the cost for saving whole system.
Description
Technical field
The utility model is related to quantum information and technical field of photo communication, more particularly to a kind of unrelated quantum of measuring apparatus
The automatic synchronizing apparatus of key distribution system.
Background technology
Quantum key distribution (Quantum Key Distribution, QKD) is that quantum mechanics is combined with information science
Product, permission provide the symmetric cryptography being perfectly safe in the presence of listener-in Eve for validated user Alice and Bob,
Therefore extensive concern is caused.Communicating pair Alice and Bob are just realized using the information encryption exchanged needed for above-mentioned key pair
Secure communication.
However, because practical devices and environment have differences with ideal, quantum key distribution is in practical applications
Safety receives huge challenge.Such as：It is attacked as the PNS of object of attack using the common weak quasi- single-photon source of coherent state, with
Single-photon detector is the detector blinding attack of object of attack, time shift attack etc., has seriously affected the safety of QKD.People
It all makes efforts theoretical and experimental, it is intended to make up these defects.2005, the proposition of state scheme is inveigled to efficiently solve weak
The defect that multi-photon ingredient is brought in the quasi- single-photon source of coherent state.2012, the proposition of measuring apparatus independent protocol was then disposable
Eliminate the security breaches at detector end.
In original measurement equipment independent protocol, Alice and Bob prepare quantum state and are sent to Charlie respectively.
Charlie carries out Bell state measurement to the photon received.If the result measured is Bell state Ψ±, then it is assumed that it measures successfully,
Charlie announces measurement result.Alice and Bob obtains primary key by the result, final by error correction and secrecy enhancing
To secure quantum key.The essence of measuring apparatus independent protocol is measured by Bell state, and Alice and Bob have shared perfectly
Entangled State, this guarantees relevance between the two is unrelated with third party Charlie, therefore Charlie can be anyone
Even listener-in, the attack innate immunity of the measuring apparatus independent protocol for end of probe.
Original measurement equipment independent protocol is communicated for two sides.Further, the thought of measuring apparatus independent protocol
Other kinds of Entangled State, such as GHZ states or W states can be extended to.Concrete implementation is slightly different, but it is basic
Thought is all to be sent to relaying after communication terminal prepares quantum state, and relaying carries out Entangled State measurement.If relaying measures so that visitor
The particle that family end is sent is in Entangled State, according to the EPR agreements of time reversal, it is believed that the virtual particle that client possesses
In Entangled State, there is incidence relation.Relaying announces measurement result, and each communication terminal prepares quantum according to measurement result and before
The information of state realizes mutual encryption key distribution.
It realizes the above process, needs to meet claimed below：The quantum state that each client is sent will be reached in correct time
Analyzer；It reaches photon and wants undistinguishable (frequency spectrum, polarization etc.).The latter may determine that various lasers by HOM effect measurements
Whether the photon sent out can reach requirement.For the former, need accurately to be delayed so that photon arrival time exactly matches, compared with
Early mode is to adjust fiber delay line manually to realize, is needed by instruments such as such as OTDR, step is very complicated.And optical fiber
Length is varied from such as time, temperature etc., and manual mode is difficult to realize real-time compensation.
Utility model content
The utility model aim is to overcome the deficiencies of the prior art and provide a kind of unrelated quantum key distribution system of measuring apparatus
The automatic synchronizing apparatus of system solves the problems, such as that photon arrival time matches in practical application.
To achieve the above object, the utility model provides the following technical solutions：
A kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus, including multiple quantum terminal units,
Multiple transmission units, 1 Quantum repeater unit and 1 synchronization unit, the synchronization unit pass through internal circuit and Quantum repeater
Unit connects, and the quantum terminal unit is connect by transmission unit with Quantum repeater unit, wherein：
The synchronization unit includes isochronous controller, synchronous laser, the first transmitting terminal beam splitter, the second transmitting terminal beam splitting
Device ... N-1 transmitting terminal beam splitters；First receiving terminal beam splitter, the second receiving terminal beam splitter ... N receiving terminal beam splitting
Device；First photodetector, the second photodetector ... N photodetectors, time-to-amplitude conversion instrument and 1 × N switch；
Multiple transmission units include passing through the sequentially connected wavelength division multiplexer of optical fiber and Wave decomposing multiplexer；
The isochronous controller controls the synchronous laser, time-to-amplitude conversion instrument and multiple quantum by electric signal respectively
Terminal unit；
The synchronous laser by optical fiber successively with the first transmitting terminal beam splitter, the second transmitting terminal beam splitting
Device ... N-1 transmitting terminal beam splitters be connected, the first transmitting terminal beam splitter, the second transmitting terminal beam splitter ... N-1
Transmitting terminal beam splitter is connected with the wavelength division multiplexer input terminal of a transmission unit respectively；
The wavelength division multiplexer output end of any one transmission unit successively respectively with the first receiving terminal beam splitter, second
Receiving terminal beam splitter ... the input terminal of N receiving terminal beam splitters connects, the first receiving terminal beam splitter, the second receiving terminal
Beam splitter ... incident light is divided into two pulses by N receiving terminals beam splitter, one of them passes through optical fiber and the Quantum repeater
Unit connects, another pulse by optical fiber successively respectively with first photodetector, the second photodetector ... the
N photodetectors are connected；
First photodetector, the second photodetector ... N photodetectors detection result pass sequentially through
1 × N is switched and time-to-amplitude conversion instrument feeds back to the isochronous controller.
Multiple quantum terminal units include sequentially connected photodetector, delay and running chip, pulse laser
Device, phase-modulator, Polarization Controller, intensity modulator and adjustable attenuator；
Wherein, it is connected by circuit between the photodetector, delay and running chip, pulse laser；
Pass through light between the pulse laser, phase-modulator, Polarization Controller, intensity modulator and adjustable attenuator
Fibre connection；
The photodetector and the adjustable attenuator output port with the Wave decomposing multiplexer of the transmission unit respectively
And input port connection.
The synchronous laser is the laser of 1310nm.
The first receiving terminal beam splitter, the second receiving terminal beam splitter ... the Transflective ratio of N receiving terminal beam splitters
It is 1:99.
The time-to-amplitude conversion instrument has beginning and end end, for measuring starting end trigger pulse and end trigger pulse
Between time delay.
The isochronous controller controls signal testing time delay of 1 × N switch selections from different links.
The Polarization Controller is horizontal for Stochastic Modulation, and vertically ,+45 degree and -45 degree polarize；
The Polarization Controller is used for the phase between random loading [0,2 π].
The intensity modulator is used to be modulated to light pulse to inveigle state or signal state.
The Quantum repeater unit carries out projection measurement to 2 to N number of photon, obtains 2 to N for receiving 2 to N number of photon
The Entangled State of a photon.
The isochronous controller is used to be arranged the delay parameter of delay driving chip, control accuracy 100ps.
Compared with prior art, the beneficial effects of the utility model are：
1. the optical fiber link between each quantum terminal unit and Quantum repeater unit does not need completely the same.
2. not needing manual intervention, system automatically adjusts delay parameter so that photon arrival time matches.
3. reducing the use of large-scale instrument, cost is reduced.
4. using wave division multiplex mode, synchronous laser uses 1310nm, the not work of interference signal pulse.
Description of the drawings
Fig. 1 is the structure diagram of the quantum terminal unit of the utility model；
Fig. 2 is the structure diagram of the Quantum repeater unit of the utility model；
Fig. 3 is the operation principle block diagram of the utility model；
Fig. 4 is the embodiment schematic diagram when quantum terminal unit number is 3 of the utility model.
The corresponding title of each component in figure：
Quantum terminal unit -1 '；Delay and running chip -101, pulse laser -102, phase-modulator -103, polarization control
Device -104 processed, intensity modulator -105, adjustable attenuator -106, optical channel monitor -107, photodetector -108；
Transmission unit -2 '；Wavelength division multiplexer -201,202 ... 20N, Wave decomposing multiplexer -211,212 ... 21N；
Quantum repeater unit -3 '；Polarization beam apparatus -301,302 ... 305, automatically controlled Polarization Controller -311,312 ...
313, single-photon detector -321,322 ... 326, coincidence counting device -331
Synchronization unit -4 '；Isochronous controller -401, lock-out pulse laser -402, time-to-amplitude conversion instrument 403,1 × N switches
404, transmitting terminal beam splitter -411,412 ... 41 (N-1) (not shown)s, receiving terminal beam splitter 421,422 ... 42N, photoelectricity
Detector -431,432 ... 43N.
Specific implementation mode
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings.
With reference to shown in attached drawing 1-4, a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus, including amount
Sub- terminal unit 1 ', transmission unit 2 ', Quantum repeater unit 3 ' and synchronization unit 4 '.
Wherein quantum terminal unit 1 ' includes delay and running chip 101, pulse laser 102, phase-modulator 103, partially
Shake controller 104, intensity modulator 105, adjustable attenuator 106, optical channel monitor 107 and photodetector 108.
Transmission unit 2 ' includes wavelength division multiplexer 201,202 ... 20N and Wave decomposing multiplexer 211,212 ... 21N；
Quantum repeater unit 3 ' includes polarization beam apparatus 301,302 ... 305, automatically controlled Polarization Controller 311,312 ...
313, single-photon detector 321,322 ... 326 and coincidence counting device 331；
Synchronization unit 4 ' includes isochronous controller 401, lock-out pulse laser 402, time-to-amplitude conversion instrument 403,1 × N switches
404, transmitting terminal beam splitter 411,412 ... 41 (N-1), receiving terminal beam splitter 421,422 ... 42N and photodetector-
431、432……43N。
Isochronous controller 401 exports a pulse and is divided into two-way, inputs the starting end of time-to-amplitude conversion instrument 403 all the way, all the way
The synchronization light pulse that synchronous laser 402 sends 1310nm is triggered, quantum terminal unit 1 ', excitation are reached through transmission unit 2 '
1550nm signal pulses；Signal pulse returns to quantum relay unit 3 ', is converted to by photodetector 321,322 ... 326
Electric impulse signal inputs the end of time-to-amplitude conversion instrument 403.Between 403 starting end of time-to-amplitude conversion instrument and end trigger pulse
Time delay be the flight time of signal in a link.Isochronous controller 401 counts each link respectively by 1 × N switches
Then time delay calculates and is arranged the delay driving chip parameter of quantum terminal unit 1 ', on the basis of the longest link of time delay, by
Successive step makes the delay time between any two pulse be less than designated value.Quantum key distribution is carried out after time adjustment.Such as
The bit error rate of fruit quantum key distribution is more than designated value, and possible cause is to be ravesdropping or link change causes pulse asynchronous,
System can synchronism detection again.
The synchronization unit 4 ' be used to demarcate before quantum key distribution quantum terminal unit 1 ' to Quantum repeater unit it
Between flight time, setting delay driving chip parameter to ensure that the pulse laser 101 of the quantum terminal unit 1 ' is sent out
The sub- relay unit of the light pulse gone out amount of reach at the time of correct 3 '.
The isochronous controller 401 is connected with lock-out pulse laser 402 by internal circuit.
402 output end of lock-out pulse laser is connect with 411 input terminal of the first transmitting terminal beam splitter by optical fiber.
The transmission end of the first transmitting terminal beam splitter 411 is connect with the second transmitting terminal beam splitter 412 by optical fiber.
The reflection end of the first transmitting terminal beam splitter 411 is connect with third wavelength division multiplexer 203 by optical fiber.
The reflection end of the second transmitting terminal beam splitter 412 is connect with the second wavelength division multiplexer 202 by optical fiber.
The transmission end of the second transmitting terminal beam splitter 412 is connect with the first wavelength division multiplexer 201 by optical fiber.
First photodetector 431, the second photodetector 432, third photodetector 433 and 1 × 3 switch
404 input terminal is connected by internal circuit.
The output end of 1 × 3 switch 404 is connect with the end of time-to-amplitude conversion instrument 403 by internal circuit.
The output end of the time-to-amplitude conversion instrument 403 is connect with isochronous controller 401 by internal circuit.
First wavelength division multiplexer 201 is connect with the first Wave decomposing multiplexer 211 by fiber channel.
Second wavelength division multiplexer 202 is connect with the second Wave decomposing multiplexer 212 by fiber channel.
The third wavelength division multiplexer 203 is connect with third Wave decomposing multiplexer 213 by fiber channel.
First Wave decomposing multiplexer 211 is connect with the photodetector of quantum terminal unit Alice by optical fiber.
Second Wave decomposing multiplexer 212 is connect with the photodetector of quantum terminal unit Bob by optical fiber.
The third Wave decomposing multiplexer 213 is connect with the photodetector of quantum terminal unit Charlie by optical fiber.
The quantum terminal unit (Alice, Bob, Charlie) is sequentially connected photodetector 108, delay and running
Chip 101, pulse laser 102, phase-modulator 103, Polarization Controller 104, intensity modulator 105 and adjustable attenuator
106。
The optical channel prison for monitoring optical power is additionally provided in the quantum terminal unit (Alice, Bob, Charlie)
Control 107, the channel monitoring 107 is connect with the Polarization Controller 104 and intensity modulator 105 respectively, the intensity tune
The attenuation of device and adjustable attenuator processed makes adjustment appropriate according to the monitoring result of channel monitoring 107.
Illustrate the work step of the utility model by taking three quantum terminal units as an example below：
The synchronization check stage：
Step 1：System initialization, all delay and running chip parameters use as default, and delay time parameter is set as
Zero.
Step 2：Isochronous controller sends pulse signal and is divided into two-way, and the starting end for being sent to time-to-amplitude conversion instrument all the way starts
Timer, another way are sent to the laser pulse that synchronous laser sends out 1310nm.
Step 3：1310nm pulse lasers are three pulses by the first beam splitter, the second beam splitter, respectively enter first,
Second, third wavelength division multiplexer.Lock-out pulse and other signals are sent collectively in fiber channel by wavelength division multiplexer.
Step 4：First, second, third Wave decomposing multiplexer divides the lock-out pulse come from the signal of fiber channel
From and be sent to quantum terminal unit.
Step 5：The synchronizable optical pulses switch of input is electric pulse, input time delay by the photodetector of quantum terminal unit
Driving chip, triggering 1550nm lasers send pulsed light.
Step 6：Phase-modulator, Polarization Controller, intensity modulator and the adjustable attenuator of quantum terminal unit be
Initial value need not be modulated pulse.1550nm light pulses return to the first, second, third wavelength-division multiplex by original optical path
Device, into third, the four, the 5th beam splitters.
Step 7：Third, the transmitted light of the four, the 5th beam splitters enter the first, second, third photodetector, reflected light
Into quantum relay unit.
Step 8：The 1550nm light pulses of input are converted to electric impulse signal by the first, second, third photodetector.Together
1 × 3 switch of controller control is walked, the electric impulse signal of photodetector is input to the end of time-to-amplitude conversion instrument in different time-gap
End.
Step 9：Time-to-amplitude conversion instrument calculates the time difference started between end trigger pulse, inputs isochronous controller.
Step 10：The time parameter between each light path is obtained by calculation in isochronous controller, on the basis of maximum duration, leads to
Cross classical channel adjustment delay chip parameter, control accuracy 100ps.
Step 11：Step 1~10 are repeated, isochronous controller gradually adjusts each delay chip so that the arteries and veins between each light path
Rush that time interval is smaller and smaller, until the interval between any two pulse is less than given index.
Step 12：Isochronous controller preserves and the subsynchronous calibration parameter of minute book, and sends each quantum terminal unit ROM
In, it is used in key distribution phase for it.
Key distribution phase：
Step 1：Each quantum terminal unit reads the delay time data in ROM, and delay and running chip trigger pulse is arranged
Laser 101 sends the pulse laser near 1550nm.108 random loading impulse phase of phase-modulator [0,2 π], meets light
Input photon is modulated to by the requirement of subnumber state, Polarization Controller 107 at random | and ψ ＞=| H>, | V>, |+>, |->, intensity tune
Pulse labeling is to inveigle state or signal state by device 106 processed, and adjustable attenuator 101 ensures that photon average is designated value.In addition, light
Channel monitor 104 is distributed according to the number of photons of Analysis of optical power pulse.
Step 2：The signal of different quantum terminal units is passed through different fibre channel transmissions by the optical transmission unit 2 '
To Quantum repeater unit 3 '.
Step 3：The joint quantum state of Quantum repeater unit analysis input photon, announces and thinks to obtain correct measurement in agreement
As a result event.
The Quantum repeater unit can be Bell state, GHZ states or W state analyzers.With a kind of GHZ states point in the present embodiment
Analyzer is as introduction.
The Quantum repeater unit analyzes the photon of input, the quantum state point of Alice, Bob, Charlie output
It is notI.e. the photon of three is all modulated to horizontal polarization, phase by Polarization Controller 107
The difference phase of position modulator 108 Stochastic Modulation Alice, Bob, Charlie are φa、φb、φc, intensity modulator 106 and adjustable
101 collective effect of attenuator so that the average photon number of Alice, Bob, Charlie are respectively μ, ν, ω.Joint quantum state isDecay by fiber channel, joint evolution of quantum state is
ηa、ηb、ηcTotal losses caused by fiber channel and device respectively between Alice, Bob, Charlie and GHZ analyzer.
Quantum repeater unit 2 ' is to above-mentioned joint quantum measurement, and if only if projecting to quantum stateWhen, i.e., when being responded simultaneously there are three detector, it is believed that measure successfully.Amount
Sub- relay unit 3 ' announces measurement result.
Step 4：Each quantum terminal unit compares the information and this that Quantum repeater unit is announced according to different protocol algorithms
Ground information, obtains quantum key.
The announcement and guidance of book according to the above description, the utility model those skilled in the art can also be to above-mentioned realities
The mode of applying is changed and is changed.Therefore, the utility model is not limited to specific implementation mode disclosed and described above, right
Some modifications and changes of utility model should also be as falling into the protection scope of the claims of the present utility model.In addition, although
Some specific terms are used in this specification, these terms are merely for convenience of description, not to the utility model structure
At any restrictions.
Claims (10)
1. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus, which is characterized in that including multiple quantum
Terminal unit, multiple transmission units, 1 Quantum repeater unit and 1 synchronization unit, the synchronization unit by internal circuit with
Quantum repeater unit connects, and the quantum terminal unit is connect by transmission unit with Quantum repeater unit, wherein：
The synchronization unit includes isochronous controller, synchronous laser, the first transmitting terminal beam splitter, the second transmitting terminal beam splitting
Device ... N-1 transmitting terminal beam splitters；First receiving terminal beam splitter, the second receiving terminal beam splitter ... N receiving terminal beam splitting
Device；First photodetector, the second photodetector ... N photodetectors and time-to-amplitude conversion instrument and 1 × N switch；
Multiple transmission units include passing through the sequentially connected wavelength division multiplexer of optical fiber and Wave decomposing multiplexer；
The isochronous controller controls the synchronous laser, time-to-amplitude conversion instrument and multiple quantum terminals by electric signal respectively
Unit；
The synchronous laser by optical fiber successively with the first transmitting terminal beam splitter, the second transmitting terminal beam splitter ...
N-1 transmitting terminal beam splitters be connected, the first transmitting terminal beam splitter, the second transmitting terminal beam splitter ... N-1 transmitting terminal beam splitting
Device is connected with the wavelength division multiplexer input terminal of a transmission unit respectively；
The wavelength division multiplexer output end of any one transmission unit is received with the first receiving terminal beam splitter, second respectively successively
End beam splitter ... the input terminal of N receiving terminal beam splitters connects, the first receiving terminal beam splitter, the second receiving terminal beam splitting
Device ... the one side of N receiving terminal beam splitters is connect by optical fiber with the Quantum repeater unit, and optical fiber is on the other hand passed through
Successively respectively with first photodetector, the second photodetector ... N photodetectors are connected；
First photodetector, the second photodetector ... N photodetectors detection result pass sequentially through 1 × N
Switch and time-to-amplitude conversion instrument feed back to the isochronous controller.
2. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus as described in claim 1, feature
Be, multiple quantum terminal units include sequentially connected photodetector, delay and running chip, pulse laser,
Phase-modulator, Polarization Controller, intensity modulator and adjustable attenuator；
Wherein, it is connected by circuit between the photodetector, delay and running chip, pulse laser；
Connected by optical fiber between the pulse laser, phase-modulator, Polarization Controller, intensity modulator and adjustable attenuator
It connects；
The photodetector and adjustable attenuator respectively with the output port of the Wave decomposing multiplexer of the transmission unit and
Input port connects.
3. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus as described in claim 1, feature
It is, the synchronous laser is the laser of 1310nm.
4. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus as described in claim 1, feature
Be, the first receiving terminal beam splitter, the second receiving terminal beam splitter ... the transmissivity of N receiving terminal beam splitters and reflection
Rate ratio is 1:99.
5. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus according to claim 1, special
Sign is that the time-to-amplitude conversion instrument has beginning and end end, for measuring starting end trigger pulse and end trigger pulse
Between time delay.
6. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus according to claim 1, special
Sign is that the isochronous controller controls signal testing time delay of 1 × N switch selections from different links.
7. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus according to claim 2, special
Sign is that the Polarization Controller is horizontal for Stochastic Modulation, and vertically ,+45 degree and -45 degree polarize；
The phase-modulator is used for the phase between random loading [0,2 π].
8. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus according to claim 2, special
Sign is that the intensity modulator, which is used to light pulse being modulated into, inveigles state or signal state.
9. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus according to claim 1, special
Sign is, the Quantum repeater unit carries out projection measurement for receiving 2 to N number of photon to 2 to N number of photon, obtains 2 to N number of
The Entangled State of photon.
10. a kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus according to claim 1, special
Sign is that the isochronous controller is used to be arranged the delay parameter of delay driving chip, control accuracy 100ps.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818740A (en) * | 2019-01-24 | 2019-05-28 | 北京邮电大学 | A kind of uplink continuous variable quantum key distribution access network method using wavelength division multiplexer |
| CN113541776A (en) * | 2020-04-14 | 2021-10-22 | 华为技术有限公司 | Method for implementing optical fiber detection and clock synchronization and related equipment |
| CN114095164A (en) * | 2021-11-22 | 2022-02-25 | 西南大学 | Quantum key distribution method based on quantum entanglement digital compression |
| CN116015479A (en) * | 2023-02-03 | 2023-04-25 | 福州大学 | Quantum time synchronization method for power system |
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2017
- 2017-12-29 CN CN201721905291.4U patent/CN207625570U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818740A (en) * | 2019-01-24 | 2019-05-28 | 北京邮电大学 | A kind of uplink continuous variable quantum key distribution access network method using wavelength division multiplexer |
| CN113541776A (en) * | 2020-04-14 | 2021-10-22 | 华为技术有限公司 | Method for implementing optical fiber detection and clock synchronization and related equipment |
| CN113541776B (en) * | 2020-04-14 | 2022-10-04 | 华为技术有限公司 | Method for implementing optical fiber detection and clock synchronization and related equipment |
| CN114095164A (en) * | 2021-11-22 | 2022-02-25 | 西南大学 | Quantum key distribution method based on quantum entanglement digital compression |
| CN116015479A (en) * | 2023-02-03 | 2023-04-25 | 福州大学 | Quantum time synchronization method for power system |
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