CN111786730B - Pilot frequency assisted local oscillator continuous variable quantum key distribution system and method - Google Patents
Pilot frequency assisted local oscillator continuous variable quantum key distribution system and method Download PDFInfo
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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
- H04B10/524—Pulse 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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/64—Heterodyne, i.e. coherent receivers where, after the opto-electronic conversion, an electrical signal at an intermediate frequency [fIF] is obtained
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
Abstract
The invention relates to the field of quantum secret communication, and discloses a pilot frequency assisted local oscillator continuous variable quantum key distribution system and a method, wherein the system comprises an Alice end and a Bob end which are connected through an optical fiber channel, the Alice end comprises a first continuous laser module, a first polarization beam splitter, an optical pulse modulation module, a signal modulation module, an optical attenuator, a reference optical module and a polarization beam combiner, and the Bob end comprises a polarization compensation module, a second continuous laser module, a second polarization beam splitter, a third polarization beam splitter, a first optical coupler, a second optical coupler, a first balance detector, a second balance detector, an analog-to-digital conversion module, a digital signal processing module and a post-processing module. The invention not only overcomes the problems of intensity bottleneck and security loophole of the local oscillator light of the associated local oscillator CVQKD system, but also solves the problem of channel crosstalk of the quantum signal light and the classical reference light on the time domain space by using the frequency division multiplexing technology, and obviously improves the safe transmission distance and the code rate.
Description
Technical Field
The invention relates to the technical field of quantum secret communication, in particular to a pilot frequency assisted local oscillator continuous variable quantum key distribution system and method.
Background
Continuous Variable Quantum Key Distribution (CVQKD) encodes Quantum information on two mutually irrelative light field regular components, and decodes the Quantum Key information by efficient zero/heterodyne detection without a single photon source and a single photon detector, most devices are general to classical coherent optical communication, have the development potential of high compatibility, high repetition frequency and high Key rate, have unconditional security of theoretical license, overcome the inherent potential safety hazard of the classical encryption technology, and are a research hotspot in the current Quantum secret communication field.
The CVQKD technique is divided into a channel-associated local oscillation scheme and a local oscillation scheme according to whether the local oscillation light coherently detected by the receiving end is transmitted with the quantum signal channel-associated. The channel-associated local oscillator CVQKD scheme transmits signal light and local oscillator light generated by homologous in the same optical fiber link in a time division and polarization multiplexing mode, and the signal light and the local oscillator light show good coherence during coherent detection, so that phase and polarization noise can be effectively suppressed (P.Jouguet, S.Kunz-Jacques, A.Leverier, et al. "Experimental demodulation of long-distance continuous-variable quadrature key distribution", Nature Photonics,2013,7(5): 378). However, the channel-associated local oscillation scheme is limited by the intensity bottleneck, security loopholes and the like of the channel-associated local oscillation light, so that the CVQKD system is limited in repetition frequency, and low in security code rate and security transmission distance.
The local oscillation scheme perfectly solves the problems, local oscillation light is introduced into the Bob end without transmission along with the path, the intensity of the local oscillation light is obviously improved, and the safety hidden trouble of the local oscillation light along with the path is eliminated (D.B.S.Soh, C.Brif, P.J.Coles, et al, "Self-referred Continuous-Variable quality Key Distribution Protocol", Physical Review X,2015,5(4): 041010.). In a local oscillator CVQKD system, because two different lasers have relative frequency drift and phase change is introduced by optical fiber channel disturbance during transmission, a channel of classical reference light signal needs to be transmitted along with a channel to accurately compensate, and in order to avoid the problem of channel crosstalk between the classical reference light and the quantum signal light, a channel multiplexing technology needs to be adopted to synchronously transmit the quantum signal light and the classical reference light.
Currently, the mainstream local oscillator CVQKD system mainly adopts a combination of time division and polarization multiplexing technologies to solve the above-mentioned channel crosstalk problem (t.wang, p.huang, y.m.zhou, et. "Pilot-multiplexed connected-variable quality key distribution with a local oscillator", Physical Review a,2018,97(1): 012310). However, with the increase of the repetition frequency of the local oscillator CVQKD system, the time division multiplexing technology is difficult to accurately separate the quantum signal light from the classical reference light in the time domain. Therefore, the technical scheme of the local oscillator CVQKD based on the combination of time division and polarization multiplexing cannot meet the development requirements of the CVQKD system with high repetition frequency and high safety code rate.
Disclosure of Invention
In order to solve the problems of intensity bottleneck and security vulnerability of local oscillator light in the current channel associated local oscillator CVQKD system and further improve the security code rate of the local oscillator CVQKD, the invention provides a pilot frequency assisted local oscillator continuous variable quantum key distribution system and a method.
A pilot frequency assisted local oscillator continuous variable quantum key distribution system comprises an Alice end and a Bob end, wherein the Alice end and the Bob end are connected through an optical fiber channel, and the system comprises:
the Alice end comprises a first continuous laser module, a first polarization beam splitter, an optical pulse modulation module, a signal modulation module, an optical attenuator, a reference optical module and a polarization beam combiner, wherein the output end of the first continuous laser module is connected with the input end of the first polarization beam splitter through an optical fiber, the output end of the first polarization beam splitter is divided into two paths, an upper path of optical fiber is connected with the optical pulse modulation module, the signal modulation module and the optical attenuator in a cascading manner, a lower path of optical fiber is connected with the reference optical module, and the two paths of optical fibers are connected to the input end of the polarization beam combiner in a combining manner;
the Bob end comprises a polarization compensation module, a second continuous laser module, a second polarization beam splitter, a third polarization beam splitter, a first optical coupler, a second optical coupler, a first balance detector, a second balance detector, an analog-to-digital conversion module, a digital signal processing module and a post-processing module, the polarization compensation module and the output end of the polarization beam combiner are connected with the input end of the second polarization beam splitter through optical fibers, and the output end of the second polarization beam splitter is connected with the input ends of the first optical coupler and the second optical coupler through optical fibers; the output end optical fiber of the second continuous laser module is connected with the input end of the third polarization beam splitter, and the output end optical fiber of the third polarization beam splitter is connected with the other input ends of the first optical coupler and the second optical coupler; the output end optical fiber of the first optical coupler is connected with the input end of the first balanced detector, the output end optical fiber of the second optical coupler is connected with the input end of the second balanced detector, the output ends of the first balanced detector and the second balanced detector are electrically connected with the analog-to-digital conversion module, and the analog-to-digital conversion module, the digital signal processing module and the post-processing module are respectively and sequentially electrically connected.
Further, the signal modulation module comprises a gaussian modulation module and a discrete modulation module.
Further, the reference optical module comprises a carrier-suppressed double-sideband modulation module, a carrier-suppressed single-sideband modulation module and an optical frequency shifter.
Further, the signal modulation module and the reference light module are synchronously connected.
A method of a local oscillator continuous variable quantum key distribution system based on pilot frequency assistance is provided, wherein the output frequency of a first continuous laser module is f1The continuous light is divided into two paths by the first polarization beam splitter, and the continuous light on the upper path passes through the light pulse modulation module to form a light pulse with repetition frequency fqThen the key information is loaded on the light part of the optical pulse signal through the signal modulation module to form the bandwidth occupation of 2 delta fqThe optical pulse signal is attenuated into quantum signal light containing key information by the optical attenuator; the frequency of the down-path continuous light is f after passing through the reference light module1±frOf (2), wherein frIs a frequency shift frequency; and finally, combining the quantum signal light and the classical reference light into an optical fiber channel through the polarization beam combiner.
Further, the optical signal output by the optical fiber channel is subjected to dynamic polarization control compensation by the polarization compensation module, the quantum signal light and the classical reference light are separated by the second polarization beam splitter, the quantum signal light is input into the first optical coupler, the classical reference light is input into the second optical coupler, and the output frequency of the second optical coupler and the output frequency of the classical reference light are f2And the third polarization beam splitter is used for dividing two paths of continuous local oscillation light to carry out coupling and balanced heterodyne detection so as to obtain corresponding electric signals.
Further, the electrical signals output by the first balanced detector and the second balanced detector are subjected to analog-to-digital conversion by the analog-to-digital conversion module, then filtering, frequency conversion and demodulation processing are performed in the digital signal processing module, phase compensation is performed on the demodulated quantum key information of the quantum signal light by the demodulated phase information of the classical reference light, so that phase drift caused by frequency drift and channel disturbance in the first continuous laser module and the second continuous laser module is eliminated, initial quantum key information is obtained, and finally, the post-processing module performs data coordination and private amplification on the initial quantum key information to output a final quantum key.
Further, shift the frequency fr>ΔfqTo ensure that quantum signal light and classical reference light do not interfere with each other during transmission in an optical fiber channel, wherein Δ fqOf the magnitude of (d) and the repetition frequency f of the optical pulse signalqAnd (4) correlating.
The invention has the beneficial effects that:
according to the invention, the local oscillator light is introduced into the Bob end, so that the problems of intensity bottleneck and security loophole of the local oscillator light in the traditional channel associated local oscillator CVQKD system are effectively solved, the local oscillator light intensity meeting shot noise detection limit at the Bob end is optimized, and the secure transmission distance and the secure code rate of the CVQKD system are further increased;
according to the invention, a high-precision frequency division multiplexing technology is used for replacing a time division multiplexing technology of the existing local oscillator CVQKD system, so that the problem of channel crosstalk of quantum signal light and classical reference light in a time domain space caused by the increase of the repetition frequency of the CVQKD system is solved, the bottleneck of the repetition frequency of the existing local oscillator CVQKD system is broken through, and the safety code rate of the CVQKD system is obviously improved;
according to the invention, through the frequency division multiplexing technology and the polarization multiplexing technology, crosstalk of quantum signal light and classical reference light in a channel is avoided, different heterodyne coherent detection can be respectively carried out on the quantum signal light and the classical reference light, low-noise detection of the quantum signal light and saturation detection of the classical reference light are ensured, and simultaneous measurement of two regular components is realized.
Drawings
FIG. 1 is a schematic diagram of a pilot-assisted local oscillator continuous variable quantum key distribution system of the present invention;
FIG. 2 is a frequency spectrum diagram of a pilot-assisted local oscillation continuous variable quantum key distribution method according to the present invention;
fig. 3 is a second frequency spectrum diagram of a pilot-assisted local oscillation continuous variable quantum key distribution method according to an embodiment of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, this embodiment provides a pilot-assisted local oscillation continuous variable quantum key distribution system, which includes an Alice end and a Bob end, where the Alice end and the Bob end are connected by an optical fiber channel, and where:
the Alice end comprises a first continuous laser module, a first polarization beam splitter, an optical pulse modulation module, a signal modulation module, an optical attenuator, a reference optical module and a polarization beam combiner, wherein the output end of the first continuous laser module is connected with the input end of the first polarization beam splitter through an optical fiber, the output end of the first polarization beam splitter is divided into two paths, the upper path of the optical fiber is connected with the optical pulse modulation module, the signal modulation module and the optical attenuator, the lower path of the optical fiber is connected with the reference optical module, and the two paths of the optical fibers are connected to the input end of the polarization beam combiner;
the Bob end comprises a polarization compensation module, a second continuous laser module, a second polarization beam splitter, a third polarization beam splitter, a first optical coupler, a second optical coupler, a first balance detector, a second balance detector, an analog-to-digital conversion module, a digital signal processing module and a post-processing module, the output ends of the polarization compensation module and the polarization beam combiner are connected with the input end of the second polarization beam splitter, and the output end of the second polarization beam splitter is connected with the input ends of the first optical coupler and the second optical coupler; the output end optical fiber of the second continuous laser module is connected with the input end of a third polarization beam splitter, and the output end optical fiber of the third polarization beam splitter is connected with the other input ends of the first optical coupler and the second optical coupler; the output end optical fiber of the first optical coupler is connected with the input end of the first balanced detector, the output end optical fiber of the second optical coupler is connected with the input end of the second balanced detector, the output ends of the first balanced detector and the second balanced detector are electrically connected with the analog-to-digital conversion module, and the analog-to-digital conversion module, the digital signal processing module and the post-processing module are respectively and sequentially electrically connected.
In a preferred embodiment of the present invention, the signal modulation module includes a gaussian modulation module and a discrete modulation module.
In a preferred embodiment of the invention, the reference optical module comprises a carrier suppressed double sideband modulation module, a carrier suppressed single sideband modulation module and an optical frequency shifter.
In a preferred embodiment of the invention, the signal modulation module is synchronously connected with the reference light module.
As shown in fig. 2, this embodiment further provides a method for a local oscillation continuous variable quantum key distribution system based on the pilot assistance, including the following steps:
step 1, the output frequency of the first continuous laser module is f1The continuous light is divided into two paths by a first polarization beam splitter, and the continuous light on the upper path passes through an optical pulse modulation module to form a repetition frequency fqThen the key information is loaded on the light part of the optical pulse signal through the signal modulation module to form the bandwidth occupation of 2 delta fqThe optical pulse signal is attenuated into quantum signal light containing key information by an optical attenuator; after the down-path continuous light passes through the reference light moduleForming a frequency of f1±frOf (2), wherein frIs a frequency shift frequency; finally, the quantum signal light and the classical reference light are combined by the polarization beam combiner to enter an optical fiber channel;
step 2, the optical signal output by the optical fiber channel is subjected to dynamic polarization control compensation by a polarization compensation module, the quantum signal light and the classical reference light are separated by a second polarization beam splitter, the quantum signal light is input into a first optical coupler, the classical reference light is input into a second optical coupler, and the output frequency of the second continuous laser module is f2The third polarization beam splitter is used for dividing two paths of continuous local oscillation light to carry out coupling and balanced heterodyne detection so as to obtain corresponding electric signals;
and 3, performing analog-to-digital conversion on the electric signals output by the first balanced detector and the second balanced detector by an analog-to-digital conversion module, then performing filtering, frequency conversion and demodulation processing in a digital signal processing module, simultaneously performing phase compensation on the quantum key information of the demodulated quantum signal light by using the phase information of the demodulated classical reference light so as to eliminate phase drift caused by frequency drift and channel disturbance in the first continuous laser module and the second continuous laser module, obtaining initial quantum key information, and finally performing data coordination and privacy amplification on the initial quantum key information by a post-processing module to output a final quantum key.
In a preferred embodiment of the invention, the frequency shift f is carried outr>ΔfqTo ensure that quantum signal light and classical reference light do not interfere with each other during transmission in an optical fiber channel, wherein Δ fqOf the magnitude of (d) and the repetition frequency f of the optical pulse signalqAnd (4) correlating.
In a preferred embodiment of the invention:
firstly, the output frequency of a first continuous laser module at an Alice end is f1Continuous light which is approximately equal to 193.5THz is divided into two paths by a first polarization beam splitter, and the continuous light on the upper path forms a repetition frequency f by passing through an optical pulse modulation moduleqAn optical pulse signal with 25MHz and a pulse width of 8ns is loaded with Gaussian distributed key information in a signal modulation module by taking Gaussian modulation as an exampleIn the light part of the pulse signal, a bandwidth of about 2 deltaf is formedqGaussian modulation optical pulse signals which are approximately equal to 240MHz are finally attenuated into quantum signal light containing key information through an optical attenuator. The lower continuous light forms a double-sideband modulation sideband f for carrier suppression after passing through the reference optical module1550MHz and f1And the classical reference light of +550MHz, the quantum signal light and the classical reference light enter an optical fiber channel with the attenuation of 0.2dB/km and the length of 25km after being combined by a polarization beam combiner based on the frequency and polarization multiplexing technology.
As shown in fig. 3, after the optical signal output from the optical fiber channel passes through the polarization compensation module, the quantum signal light and the classical reference light are separated by the second polarization beam splitter, and are respectively coupled and input to the first balanced detector and the second balanced detector, and then output with the second continuous laser module at a frequency f2＝f1And the continuous light of +200MHz is divided into two beams of local oscillator light by a third polarization beam splitter to carry out heterodyne coherent detection. The beat frequency signal of the quantum signal light and the local oscillator light is 200MHz as the center frequency, and the bandwidth is 2 delta fqAnd the spectrum is approximately matched with the 240MHz spectrum, and the central frequency of the beat frequency signal of the classical reference light and the local oscillator light is a spectrum sideband of 350 MHz.
The electric signals output by the first balanced detector and the second balanced detector are subjected to analog-to-digital conversion by the analog-to-digital conversion module and then are subjected to filtering, frequency conversion and demodulation in the digital signal processing module. The digital filter of the signal light is set to have a center frequency of 200MHz and a filtering bandwidth of about 240 MHz. The digital filter for the reference light is set to a center frequency of 350MHz and the narrow-band filtering bandwidth is about 1 MHz. And then performing down-conversion, baseband filtering and demodulation processing on the filtered data, extracting the phase information of the classical reference light for phase compensation of quantum signal light, obtaining initial quantum key information, and finally performing data coordination and privacy amplification on the initial quantum key information by a post-processing module to output a final quantum key.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed when the present invention is used, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection, electrical connection or optical fiber connection; either a wired or wireless connection.
Claims (6)
1. A pilot frequency assisted local oscillator continuous variable quantum key distribution system comprises an Alice end and a Bob end, wherein the Alice end and the Bob end are connected through an optical fiber channel, and the system is characterized in that:
the Alice end comprises a first continuous laser module, a first polarization beam splitter, an optical pulse modulation module, a signal modulation module, an optical attenuator, a reference optical module and a polarization beam combiner, wherein the output end of the first continuous laser module is connected with the input end of the first polarization beam splitter through an optical fiber, the output end of the first polarization beam splitter is divided into two paths, an upper path of optical fiber is connected with the optical pulse modulation module, the signal modulation module and the optical attenuator in a cascading manner, a lower path of optical fiber is connected with the reference optical module, and the two paths of optical fibers are connected to the input end of the polarization beam combiner in a combining manner; the signal modulation module comprises a Gaussian modulation module and a discrete modulation module, and the reference optical module comprises a carrier-suppressed double-sideband modulation module, a carrier-suppressed single-sideband modulation module and an optical frequency shifter;
the Bob end comprises a polarization compensation module, a second continuous laser module, a second polarization beam splitter, a third polarization beam splitter, a first optical coupler, a second optical coupler, a first balance detector, a second balance detector, an analog-to-digital conversion module, a digital signal processing module and a post-processing module, the polarization compensation module and the output end of the polarization beam combiner are connected with the input end of the second polarization beam splitter through optical fibers, and the output end of the second polarization beam splitter is connected with the input ends of the first optical coupler and the second optical coupler through optical fibers; the output end optical fiber of the second continuous laser module is connected with the input end of the third polarization beam splitter, and the output end optical fiber of the third polarization beam splitter is connected with the other input ends of the first optical coupler and the second optical coupler; the output end optical fiber of the first optical coupler is connected with the input end of the first balanced detector, the output end optical fiber of the second optical coupler is connected with the input end of the second balanced detector, the output ends of the first balanced detector and the second balanced detector are electrically connected with the analog-to-digital conversion module, and the analog-to-digital conversion module, the digital signal processing module and the post-processing module are respectively and sequentially electrically connected.
2. The pilot-assisted local oscillator continuous variable quantum key distribution system according to claim 1, wherein the signal modulation module is synchronously connected to the reference optical module.
3. A method for a pilot-assisted local oscillator continuous variable quantum key distribution system according to claim 1 or 2, wherein the first continuous laser module outputs a frequency off 1The continuous light is divided into two paths by the first polarization beam splitter, and the upper path of continuous light passes through the first polarization beam splitterThe optical pulse modulation module forms a repetition frequency off q Then the key information is loaded on the light part of the optical pulse signal through the signal modulation module to form the bandwidth occupation of 2Δf q The optical pulse signal is attenuated into quantum signal light containing key information by the optical attenuator; the frequency of the down-path continuous light passing through the reference light module isf 1±f r Of a classical reference light, whereinf r Is a frequency shift frequency; and finally, combining the quantum signal light and the classical reference light into an optical fiber channel through the polarization beam combiner.
4. The method according to claim 3, wherein the optical signal output by the optical fiber channel is dynamically polarization-controlled and compensated by the polarization compensation module, and the second polarization beam splitter separates the quantum signal light from the classical reference light, and the quantum signal light is input to the first optical coupler, the classical reference light is input to the second optical coupler, and the output frequencies of the first optical coupler and the classical reference light are equal to the output frequency of the second continuous laser modulef 2And the third polarization beam splitter is used for dividing two paths of continuous local oscillation light to carry out coupling and balanced heterodyne detection so as to obtain corresponding electric signals.
5. The pilot-assisted local oscillation continuous variable quantum key distribution method according to claim 4, wherein the analog-to-digital conversion module performs analog-to-digital conversion on the electrical signals output by the first balanced detector and the second balanced detector, the digital signal processing module performs filtering, frequency conversion and demodulation, phase compensation is performed on the quantum key information of the demodulated quantum signal light by using the phase information of the demodulated classical reference light, so as to eliminate phase drift caused by frequency drift and channel disturbance in the first continuous laser module and the second continuous laser module, initial quantum key information is obtained, and finally the post-processing module performs data coordination and private amplification on the initial quantum key information to output a final quantum key.
6. The method as claimed in claim 3, wherein the frequency shift frequency is a frequency shift frequencyf r >Δf q To ensure that the quantum signal light and the classical reference light do not interfere with each other during transmission in the optical fiber channel, whereinΔf q Of the magnitude of (D) and the repetition frequency of the optical pulse signalf q And (4) correlating.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112311541A (en) * | 2020-11-16 | 2021-02-02 | 南京大学 | Heterodyne measurement-based four-state quantum key distribution method and system |
| CN112468298B (en) * | 2021-01-27 | 2021-04-23 | 北京中创为南京量子通信技术有限公司 | Pulse modulation device, transmitter, system and method for CV-QKD |
| CN113037473B (en) * | 2021-03-01 | 2022-07-15 | 中南大学 | CVQKD system and method based on silicon photonic integrated chip |
| CN113055167B (en) * | 2021-03-22 | 2022-06-03 | 上海循态量子科技有限公司 | Defense method and system based on security vulnerability in chip CVQKD actual system |
| CN112887033B (en) * | 2021-05-06 | 2021-08-24 | 北京中创为南京量子通信技术有限公司 | CV-QKD system and quantum key distribution method |
| CN113660043B (en) * | 2021-07-22 | 2022-07-05 | 中国电子科技集团公司第三十研究所 | Local oscillator CVQKD method and system for channelized reception |
| CN114285489B (en) * | 2021-12-24 | 2023-11-07 | 上海交通大学 | Optical soliton-based wavelength division multiplexing continuous variable quantum key distribution system and method |
| CN114650206B (en) * | 2022-04-08 | 2023-05-05 | 中国电子科技集团公司第三十研究所 | Quantum key distribution system phase noise compensation method, device, equipment and medium |
| CN115296748A (en) * | 2022-07-14 | 2022-11-04 | 武汉光谷信息光电子创新中心有限公司 | Polarization modulator and quantum key distribution system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207947788U (en) * | 2018-03-30 | 2018-10-09 | 上海国盾量子信息技术有限公司 | A kind of decoding apparatus and dissemination system for continuous variable quantum key distribution |
| CN110896329A (en) * | 2018-09-12 | 2020-03-20 | 中国科学技术大学 | Continuous variable quantum key distribution coherent detection system based on local oscillator light scheme |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109104251B (en) * | 2017-06-20 | 2021-07-16 | 华为技术有限公司 | Data transmission method, device and system |
| CN107666353B (en) * | 2017-08-29 | 2020-09-15 | 上海循态信息科技有限公司 | Local oscillator continuous variable quantum key distribution method based on phase compensation |
| WO2019233591A1 (en) * | 2018-06-08 | 2019-12-12 | Huawei Technologies Duesseldorf Gmbh | Transmitter and receiver for transmitting and receiving a quantum signal |
| CN110851111B (en) * | 2019-10-15 | 2022-08-23 | 中国电子科技集团公司第三十研究所 | High-safety source-independent quantum random number generation device and method |
-
2020
- 2020-06-08 CN CN202010512910.3A patent/CN111786730B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207947788U (en) * | 2018-03-30 | 2018-10-09 | 上海国盾量子信息技术有限公司 | A kind of decoding apparatus and dissemination system for continuous variable quantum key distribution |
| CN110896329A (en) * | 2018-09-12 | 2020-03-20 | 中国科学技术大学 | Continuous variable quantum key distribution coherent detection system based on local oscillator light scheme |
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