CN208707646U - A kind of clock synchronization system in quantum secret communication - Google Patents
A kind of clock synchronization system in quantum secret communication Download PDFInfo
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- CN208707646U CN208707646U CN201820755902.XU CN201820755902U CN208707646U CN 208707646 U CN208707646 U CN 208707646U CN 201820755902 U CN201820755902 U CN 201820755902U CN 208707646 U CN208707646 U CN 208707646U
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Abstract
The utility model provides the clock synchronization system in a kind of quantum secret communication, comprising: synchronous light emitting devices carries out frame number for being emitted synchronizable optical, and to synchronizable optical；Signal light emitting end is used for output signal light, and carries out label to signal light light pulse according to the time interval of signal light light pulse and the synchronizable optical light pulse of its affiliated frame；Pattern multiplexer, for by signal light with after synchronous optical coupling by same root less fundamental mode optical fibre transmission；Pattern demultiplexer, for receiving the signal light after coupling and synchronizable optical and being split signal light and synchronizable optical；PIN detector identifies the frame number of synchronizable optical for detecting synchronizable optical；Single-photon detector is used for detectable signal light, the time interval of synchronizable optical light pulse of the measuring signal light light pulse apart from its affiliated frame；The label of the signal light light pulse received and the label of the signal light light pulse of transmission are corresponded；Correction module synchronizes amendment to signal light for determining that link transmission is delayed.
Description
Technical field
The utility model relates to Technique on Quantum Communication fields, more particularly to the time synchronization in a kind of quantum secret communication
System.
Background technique
Quantum secret communication is based on fundamental principles of quantum mechanics, the characteristic with unconditional security.Quantum secret communication with
Single photon realizes that the information privacy between terminal is safely transmitted as carrier.Nearly more than ten years, Quantum Secure Communication are at full speed
Development, core quantum key distribution (QKD) have been realized in a series of engineering applications, are national security, finance, electric power etc.
Realm information business provides quantum safety guarantee.
Quantum key distribution is divided into transmitting terminal Alice and receiving end Bob, mostly uses single mode optical fiber as transmission channel.Hair
Sending end Alice randomly choose one group of basic vector ("+" basic vector or "×" basic vector) and some state under this basic vector to photon into
Row coding, can be obtained four kinds of polarization state photons, is horizontal state of polarization H (being denoted as →), perpendicular polarisation state V (being denoted as ↑) ,+45 ° respectively
Polarization state P (Ji Zuo ↗), -45 ° of polarization state N (Ji Zuo ↘).Photon receiving end Bob is received after transmission.Bob is received
To after photon, also randomly chooses one group of basic vector and measure, and measurement result is recorded.Alice and Bob selects basic vector
It is all random and mutually independent.
Then, Alice and Bob passes through classical channel progress basic vector comparison, i.e. Bob announces selected when its measurement photon
Basic vector, Alice compare the basic vector and its selected basic vector when sending photon of Bob selection, retain and select the identical data of basic vector,
The data of different basic vectors are selected to abandon.Then pass through error correction, privacy amplification and etc. obtain safe key.
QKD equipment needs to carry out self calibration before operating normally work.The work of QKD equipment Alignment mainly includes light intensity
Feedback, delayed sweep, polarization feedback and synchronous amendment.
Light intensity feedback function completes intensity stability maintenance, and the fluctuation that compensation intensity modulator is generated by external environment variation is allowed to
It is maintained at preset state.Delayed sweep function completes the optimization of the detection efficient to the snowslide single-photon detector of gate.Gate
The gate-control signal of single-photon detector passes through the delay chip of 4 road adjustable delays, and the delay value by adjusting the delay chip obtains
To detection efficient count rate curve and maximizing, the setting value of delay chip in this case is optimal value.Polarization feedback
Function completes polarization state monitoring and the feedback compensation of the QKD system signal pulse based on polarization encoder.
Finally, synchronizing amendment step.Synchronous debugging functions complete the time for the signal pulse that detector receives
Difference relative to synchronizable optical pulse arrival time measures, because optical fiber link and electronics circuit can be to signal lights and synchronizable optical
Generate different link delays.So starting synchronous amendment in system initialisation phase, obtained by synchronous debugging functions above-mentioned
Time difference can be used for subsequent judgement detection time position and send the relativeness between sequence location.
Synchronous debugging functions guarantee that quantum secret communication both sides Alice and Bob is carrying out the time synchronization in communication process,
Ensure that both sides are to carry out basic vector comparison for basic vector belonging to the same photon state, is not in dislocation.Clock Synchronization Technology is
The key technology of quantum secret communication system has decided on whether that safe quantum key can be generated.
Existing Clock Synchronization Technology mainly includes two kinds.First method is that transmission of quantum letter is distinguished by two optical fiber
Number light synchronization optical signal synchronous with clock.It is additional to occupy an optical fiber as synchronizable optical signal channel significant wastage optical fiber
Resource.Moreover, quantum signal light and synchronizable optical are transmitted in two optical fiber respectively, the transmission environment of the two is different, is being transmitted across
Haves the defects that relative phase shake in journey.Second is the method based on wavelength-division multiplex, by same root optical fiber come transmission quantity
Subsignal light and synchronizable optical.For example, synchronous optical wavelength is different from quantum signal optical wavelength, and synchronous light frequency proportion subsignal
Light frequency is much smaller.Synchronizable optical and quantum signal light are coupled into same root single mode optical fiber by wavelength division multiplexer to be transmitted.
Pass through the phase difference of time delay module control amount subsignal light and synchronizable optical, it is ensured that synchronous optical signal will not generate quantum signal light
Crosstalk.
For example, a length of 1550.12nm of quantum signal light wave, the repetition rate that shines is 40MHz, and synchronous optical wavelength is
1570nm, the repetition rate that shines are 100KHz.Quantum signal light of the synchronizable optical as reference signal, between two synchronous optical signals
It forms a frame and it is numbered.Bob receives synchronous optical signal and can determine affiliated quantum according to synchronizable optical number
Which frame signal light belongs to.The time slot between some quantum signal light and synchronizable optical is measured, again to determine the quantum signal
Light belong to the frame which, so as to realize the time synchronization between Alice and Bob.
Method for distinguishing transmission of quantum signal light and synchronizable optical using two optical fiber, fiber resource waste are serious.
Moreover, being affected by the external environment also different because quantum signal light is different with synchronizable optical transmission channel, cause the opposite phase of the two
The defect of position shake, and influence of the defect to high repetition frequency system is fatal.Wavelength-division multiplex is passed through for simple optical fiber
Technology by quantum signal light with synchronize be optically coupled into the method transmitted in same root optical fiber, although can realize well
Time synchronization between Alice and Bob, but because synchronizable optical needs additionally to occupy a wavelength channel, optical-fiber network medium wavelength money
Source is valuable and limited, occupies the establishment that wavelength channel is unfavorable for extensive quantum secret communication network.
Utility model content
In view of the foregoing deficiencies of prior art, the purpose of this utility model is to provide in a kind of quantum secret communication
Clock synchronization system, for solving the problems, such as that existing double-fiber simultaneous techniques and single fiber wavelength-division simultaneous techniques are individually present.It is right
In the method for transmitting signal light and synchronizable optical respectively using two optical fiber, fiber resource waste is serious, and signal light and same
It is different to walk optical transport channel, is affected by the external environment also different, easily causes the two relative phase shake；And simple optical fiber is logical
The method that wavelength-division multiplex technique carries out time synchronization is crossed, wavelength channel is occupied, is unfavorable for extensive quantum secret communication network
It sets up.
The utility model provides the clock synchronization system in a kind of quantum secret communication, comprising: synchronous light emitting devices,
Frame number is carried out for being emitted synchronizable optical, and to the synchronizable optical；Signal light emitting end is used for output signal light, and according to institute
It states signal light light pulse and the time interval of the synchronizable optical light pulse of its affiliated frame marks each signal light light pulse
Number；Pattern multiplexer, for by the signal light with after the synchronous optical coupling by same root less fundamental mode optical fibre transmission；Mould
Formula demultiplexer, for receive the signal light after coupling and the synchronizable optical and by the signal light and the synchronizable optical into
Row beam splitting；PIN detector identifies the frame number of the synchronizable optical for detecting the synchronizable optical；Single-photon detector,
For detecting the signal light, and measure the time of the synchronizable optical light pulse of the signal light light pulse apart from its affiliated frame
Interval；And the label of the signal light light pulse received according to time interval judgement；The signal that will be received
The label of the signal light light pulse of the label and transmission of light light pulse corresponds；Correction module, for determining the letter
Link transmission delay number between light light pulse and the synchronizable optical light pulse, synchronizes amendment to the signal light.
In an embodiment of the utility model, the signal light emitting end further include polarization state preparation and attenuation module,
For the signal light to be carried out polarization state preparation and decaying, the other tetra- road polarised light of H, V, P, N of single-photon-level is prepared.
In an embodiment of the utility model, the synchronous light emitting devices includes: synchronous optical transmitting set, for being emitted
Synchronizable optical；Optical attenuator, for the synchronizable optical of outgoing to decay；Mode converter, described in after decaying
The mode of synchronizable optical is converted to higher order mode by basic mode.
In an embodiment of the utility model, the signal light emitting end is also used to determine signal light light when transmission
First time interval of the pulsion phase for the synchronizable optical light pulse；Described in the single-photon detector is also used to when determination receives
Second time interval of the signal light light pulse relative to the synchronizable optical light pulse；The correction module, is also used to according to
Difference between first time interval and second time interval determines the signal light light pulse and the synchronizable optical light arteries and veins
Link transmission delay between punching.
As described above, the clock synchronization system in a kind of quantum secret communication of the utility model, has below beneficial to effect
Fruit:
Without increasing additional fiber channel, by mode division multiplexing device by quantum signal light with synchronize be optically coupled into it is same
Root fibre channel transmission, this measure dramatically save fiber resource.
Moreover, synchronizable optical is not take up wavelength channel for multichannel QKD wavelength-division multiplex system, being equivalent to reduces every road amount
The wavelength-division multiplex Insertion Loss of subsignal light improves every road QKD service feature, including at code rate, transmission range etc., extensive setting up
When quantum secret communication network, there is objective economic benefit.
Detailed description of the invention
Fig. 1 is shown as in the utility model the structural schematic diagram of the clock synchronization system in quantum secret communication.
Fig. 2 is shown as the light arteries and veins of transmitting terminal synchronizable optical and signal light when quantum secret communication in the utility model is synchronous to be corrected
Rush schematic diagram.
Fig. 3 is shown as the light arteries and veins of receiving end synchronizable optical and signal light when quantum secret communication in the utility model is synchronous to be corrected
Rush schematic diagram.
Fig. 4 is shown as the light arteries and veins of transmitting terminal synchronizable optical and signal light when quantum secret communication time synchronization in the utility model
Rush schematic diagram.
Fig. 5 is shown as the light arteries and veins of receiving end synchronizable optical and signal light when quantum secret communication time synchronization in the utility model
Rush schematic diagram.
Specific embodiment
Illustrate the embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages and effect of the utility model easily.The utility model can also be by addition
Different specific embodiments are embodied or practiced, and the various details in this specification can also be based on different viewpoints and answer
With carrying out various modifications or alterations under the spirit without departing from the utility model.It should be noted that the case where not conflicting
Under, the feature in following embodiment and embodiment can be combined with each other.
It should be noted that diagram provided in following embodiment only illustrates the basic of the utility model in a schematic way
Conception, only shown in diagram then with related component in the utility model rather than component count when according to actual implementation, shape
And size is drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout
Kenel may also be increasingly complex.
Referring to Fig. 1 to Fig. 5, it should however be clear that the appended diagram of this specification depicted structure, ratio, size etc., only to match
The revealed content of specification is closed, so that those skilled in the art understands and reads, being not intended to limit the utility model can
The qualifications of implementation, therefore do not have technical essential meaning, the tune of the modification of any structure, the change of proportionate relationship or size
It is whole, in the case where not influencing the effect of the utility model can be generated and the purpose that can reach, it should all still fall in the utility model institute
The technology contents of announcement obtain in the range of capable of covering.Meanwhile in this specification it is cited as "upper", "lower", "left", "right",
The term of " centre " and " one " etc. is merely convenient to being illustrated for narration, rather than to limit the enforceable range of the utility model,
Its relativeness is altered or modified, under the content of no substantial changes in technology, when being also considered as the enforceable scope of the utility model.
Shown in Fig. 1 to 5, the structure for the clock synchronization system that Fig. 1 is shown as in the utility model in quantum secret communication is shown
It is intended to.Fig. 2 is shown as the light pulse of transmitting terminal synchronizable optical and signal light when quantum secret communication in the utility model is synchronous to be corrected
Schematic diagram.Fig. 3 is shown as the light arteries and veins of receiving end synchronizable optical and signal light when quantum secret communication in the utility model is synchronous to be corrected
Rush schematic diagram.Fig. 4 is shown as the light of transmitting terminal synchronizable optical and signal light when quantum secret communication time synchronization in the utility model
Pulse schematic diagram.Fig. 5 is shown as receiving end synchronizable optical and signal light when quantum secret communication time synchronization in the utility model
Light pulse schematic diagram.The utility model provides the clock synchronization system in a kind of quantum secret communication, comprising:
Synchronous light emitting devices carries out frame number for being emitted synchronizable optical, and to synchronizable optical；Signal light emitting end, is used for
Output signal light, and according to the time interval of signal light light pulse and the synchronizable optical light pulse of its affiliated frame to each signal light light
Pulse carries out label；When initial outgoing, signal light and synchronizable optical are basic mode mode, and after outgoing, synchronizable optical switchs to higher order mode,
In an embodiment of the utility model, signal light emitting end further includes polarization state preparation and attenuation module, is used for signal light
Polarization state preparation and decaying are carried out, the other tetra- road polarised light of H, V, P, N of single-photon-level is prepared.In another reality of the utility model
It applies in example, synchronous light emitting devices includes: synchronous optical transmitting set, for being emitted synchronizable optical；Optical attenuator, it is same for that will be emitted
Step light is decayed；Mode converter, for the mode of the synchronizable optical after decaying to be converted to higher order mode by basic mode.In this reality
Signal light light pulse is relative to synchronizable optical light arteries and veins when being sent in novel another embodiment, signal light emitting end is also used to determine
The first time interval of punching.
Pattern multiplexer, for by signal light with after synchronous optical coupling by same root less fundamental mode optical fibre transmission；Transmission
Channel is less fundamental mode optical fibre, and less fundamental mode optical fibre can realize multiplexing by increasing the mode for the light beam propagated in single-core fiber, mention
It is unobvious to the increase in demand of energy consumption under the premise of high-transmission capacity.Compared with traditional single mode optical fiber, the mould field of less fundamental mode optical fibre
Diameter is bigger, can support more transmission modes, and decaying will not significantly increase.Compared with multimode fibre, less fundamental mode optical fibre is passed
Defeated loss is smaller, and transmission range is farther, the easily controllable coupling between reduction mode.
Pattern demultiplexer, for receiving the signal light after coupling and synchronizable optical and being divided signal light and synchronizable optical
Beam.
PIN detector identifies the frame number of synchronizable optical for detecting synchronizable optical.
Single-photon detector for detecting the signal light, and measures the signal light light pulse apart from its affiliated frame
The time interval of the synchronizable optical light pulse；And the mark of the signal light light pulse received according to time interval judgement
Number；The label of the signal light light pulse received and the label of the signal light light pulse of transmission are corresponded.
Correction module, for determining that the link transmission between the signal light light pulse and the synchronizable optical light pulse is prolonged
When, amendment is synchronized to the signal light.
In the starting of QKD equipment, equipment Alignment work will do it, wherein just containing synchronous amendment step.Synchronous amendment
Step is exactly
The time location that each signal light light pulse is accurately positioned lays the foundation.
In an embodiment of the utility model, the single-photon detector is also used to determine signal light light when reception
Second time interval of the pulsion phase for the synchronizable optical light pulse；The correction module was also used to according to the first time
Difference between interval and second time interval determines between the signal light light pulse and the synchronizable optical light pulse
Link transmission delay.After completing synchronous amendment, it is smaller than signal light frequency to synchronize light frequency very much for sending cycle synchronizable optical and signal light
It is more.Each synchronizable optical light pulse forms a frame light pulse signal followed by a string of signal light light pulses.Each synchronizable optical is carried out
Sequence number, and measure the time interval of synchronizable optical light pulse of some signal light light pulse apart from frame where it, that is, it can determine
Which frame the signal light light pulse belongs to, and which is a, and the deadline is synchronous.
It is illustrated below with an embodiment of the present invention, transmitting terminal goes out the signal light that emission mode is basic mode, by letter
The preparation of number polarization state and attenuation module, prepare the other tetra- road polarised light of H, V, P, N of required single-photon-level.Synchronizable optical and letter
Number light is identical, and the emission mode that goes out of synchronizable optical is basic mode.Synchronizable optical first passes through optical attenuator and carries out light intensity attenuation, then passes through
Mode converter is converted into LP11 mode or other higher order modes.Basic mode quantum signal light and high-order mode synchronizable optical are multiple by mode
Same root less fundamental mode optical fibre channel is coupled into device to be transmitted.In general, the chain between signal light emitting end and pattern multiplexer
Single mode optical fiber or less fundamental mode optical fibre can be used in road, and the link between mode converter and pattern multiplexer uses less fundamental mode optical fibre.?
Receiving end, signal light and synchronizable optical are split by pattern demultiplexer, and the single-photon detector of signal light receiving end connects
It receives, synchronizable optical is detected by PIN detector and received.In general, the link between pattern demultiplexer and single-photon detector can be used
Single mode optical fiber or less fundamental mode optical fibre, the link between pattern demultiplexer and PIN detector use less fundamental mode optical fibre.
As shown in Figures 2 to 5, for QKD equipment before operating normally work, system will do it initialization of calibration.It completes
After light intensity feedback, delayed sweep, polarization feedback, amendment step can be synchronized one by one for tetra- road signal light of H, V, P, N.With
For the signal light of the road H, synchronous light laser issues the recurrent pulse light that repetition rate is 100kHz, the road H signal light laser
The periodic pulse signal light that repetition rate is 100kHz is issued, synchronizable optical is identical with the wavelength of signal light.In transmitting terminal, signal light
Light pulse is fixed relative to synchronizable optical optical pulse time interval, is denoted as T1.
After optical fiber link and electronics circuit, synchronizable optical light pulse and signal light the light pulse delay detected is deposited
In difference.The time interval T2 of synchronizable optical light pulse and signal light light pulse is determined after repeatedly detecting statistics.Because of link
Postpone different, compared to the time interval T1 of synchronizable optical light pulse and signal light light pulse in transmitting terminal, is introduced in receiving end
Time interval difference DELTA T.Because determining that signal light light pulse sequence number is to rely on to measure itself and affiliated frame in receiving end
The time interval of synchronizable optical light pulse is completed.For some light pulse of transmitting terminal, with synchronizable optical optical pulse time interval
For T1, and in receiving end, the signal light light pulse and synchronizable optical optical pulse time interval detected becomes T2, T1 and T2 phase
Poor Δ T.Therefore when actually determining signal light light pulse position, need to deduct Δ T.Modified purpose is synchronized exactly for receiving end
The time interval " recovery " of signal light light pulse and synchronizable optical light pulse is at the time interval in transmitting terminal, to guarantee to detect
The sequence number for the signal light light pulse arrived and the sequence number of signal light light pulse of transmitting terminal are consistent.
After completing synchronous amendment, transmitting terminal carries out sequence number to each synchronizable optical light pulse.According to each signal light
Each signal light light pulse is numbered in light pulse and the synchronizable optical optical pulse time interval of its affiliated frame.Transmitting terminal is to two
It is first frame and the second frame that synchronizable optical light pulse is numbered respectively.It is and same for second signal light light pulse a in first frame
Step light light pulse a time interval is Ta, for the 4th signal light light pulse b in the second frame, when with synchronizable optical light pulse b
Between between be divided into Tb.Signal light light pulse a is numbered according to the synchronizable optical light pulse a of frame where it and determined its institute in receiving end
Belong to first frame, measures it and can determine it for second light pulse in first frame with synchronizable optical light pulse a time interval Ta.For letter
Number light light pulse b numbers according to the synchronizable optical light pulse b of frame where it and determines its affiliated second frame, measures itself and synchronizable optical light
Pulse b time interval Tb can determine it for the 4th light pulse in the second frame.In this way, guarantee the signal light light pulse that detects with
The signal light light pulse of transmitting terminal corresponds, and is not in dislocation, achievees the purpose that time synchronization.Time synchronization can ensure
Transmitting terminal and receiving end carry out being the photon state for the same photon when basic vector comparison, and guarantee system can normally generate safety
Quantum key.
In conclusion the clock synchronization system in the quantum secret communication of the utility model, without increasing additional optical fiber
Channel, by mode division multiplexing device by quantum signal light with synchronize be optically coupled into same root fibre channel transmission, this measure is greatly
Save fiber resource.Moreover, synchronizable optical is not take up wavelength channel, and being equivalent to reduces for multichannel QKD wavelength-division multiplex system
The wavelength-division multiplex Insertion Loss of every road quantum signal light improves every road QKD service feature, including at code rate, transmission range etc., is setting up
When extensive quantum secret communication network, there is objective economic benefit.So the utility model effectively overcomes the prior art
In various shortcoming and have high industrial utilization value.
The above embodiments are only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model
All equivalent modifications or change completed under mind and technical idea, should be covered by the claim of the utility model.
Claims (3)
1. the clock synchronization system in a kind of quantum secret communication, comprising:
Synchronous light emitting devices carries out frame number for being emitted synchronizable optical, and to the synchronizable optical；
Signal light emitting end is used for output signal light, and according to the synchronizable optical light arteries and veins of the signal light light pulse and its affiliated frame
The time interval of punching carries out label to each signal light light pulse；
PIN detector identifies the frame number of the synchronizable optical for detecting the synchronizable optical；
Single-photon detector for detecting the signal light, and measures the signal light light pulse apart from described in its affiliated frame
The time interval of synchronizable optical light pulse；And the label of the signal light light pulse received according to time interval judgement；
The label of the signal light light pulse received and the label of the signal light light pulse of transmission are corresponded；
Correction module is right for determining that the link transmission between the signal light light pulse and the synchronizable optical light pulse is delayed
The signal light synchronizes amendment；
It is characterized by further comprising:
Pattern multiplexer, for by the signal light with after the synchronous optical coupling by same root less fundamental mode optical fibre transmission；
Pattern demultiplexer, for receiving the signal light after coupling and the synchronizable optical and by the signal light and described same
Step light is split.
2. the clock synchronization system in quantum secret communication according to claim 1, which is characterized in that the signal light hair
Penetrating end further includes polarization state preparation and attenuation module, for preparing list for signal light progress polarization state preparation and decaying
The tetra- road polarised light of H, V, P, N of photon level.
3. the clock synchronization system in quantum secret communication according to claim 1, which is characterized in that the synchronizable optical hair
Injection device includes:
Synchronous optical transmitting set, for being emitted synchronizable optical；
Optical attenuator, for the synchronizable optical of outgoing to decay；
Mode converter, for the mode of the synchronizable optical after decaying to be converted to higher order mode by basic mode.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518984A (en) * | 2018-05-21 | 2019-11-29 | 科大国盾量子技术股份有限公司 | Method for synchronizing time and system in a kind of quantum secret communication |
| CN111600825A (en) * | 2020-05-16 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Synchronization method based on equal interval time pulse |
| CN112034525A (en) * | 2020-08-25 | 2020-12-04 | 广州安协科技股份有限公司 | Correlation light curtain without synchronization, detection system and detection method |
| CN113541940A (en) * | 2020-12-30 | 2021-10-22 | 广东国腾量子科技有限公司 | Time synchronization method for quantum key distribution |
| CN113708847A (en) * | 2021-08-12 | 2021-11-26 | 国开启科量子技术(北京)有限公司 | Gate control device for single-photon detector and quantum communication equipment |
| CN113810181A (en) * | 2020-06-17 | 2021-12-17 | 科大国盾量子技术股份有限公司 | Data transmission method and device applied to quantum key distribution |
-
2018
- 2018-05-21 CN CN201820755902.XU patent/CN208707646U/en not_active Withdrawn - After Issue
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518984A (en) * | 2018-05-21 | 2019-11-29 | 科大国盾量子技术股份有限公司 | Method for synchronizing time and system in a kind of quantum secret communication |
| CN110518984B (en) * | 2018-05-21 | 2023-09-26 | 科大国盾量子技术股份有限公司 | Time synchronization method and system in quantum secret communication |
| CN111600825A (en) * | 2020-05-16 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Synchronization method based on equal interval time pulse |
| CN113810181A (en) * | 2020-06-17 | 2021-12-17 | 科大国盾量子技术股份有限公司 | Data transmission method and device applied to quantum key distribution |
| CN113810181B (en) * | 2020-06-17 | 2022-05-13 | 科大国盾量子技术股份有限公司 | Data transmission method and device applied to quantum key distribution |
| CN112034525A (en) * | 2020-08-25 | 2020-12-04 | 广州安协科技股份有限公司 | Correlation light curtain without synchronization, detection system and detection method |
| CN113541940A (en) * | 2020-12-30 | 2021-10-22 | 广东国腾量子科技有限公司 | Time synchronization method for quantum key distribution |
| CN113541940B (en) * | 2020-12-30 | 2023-07-07 | 广东国腾量子科技有限公司 | Time synchronization method for quantum key distribution |
| CN113708847A (en) * | 2021-08-12 | 2021-11-26 | 国开启科量子技术(北京)有限公司 | Gate control device for single-photon detector and quantum communication equipment |
| CN113708847B (en) * | 2021-08-12 | 2022-06-03 | 国开启科量子技术(北京)有限公司 | Gate control device for single-photon detector and quantum communication equipment |
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