CN1614918A - Quantum pin distributed free space multi-chnnel transmitting and receiving system - Google Patents
Quantum pin distributed free space multi-chnnel transmitting and receiving system Download PDFInfo
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- CN1614918A CN1614918A CN 200410089021 CN200410089021A CN1614918A CN 1614918 A CN1614918 A CN 1614918A CN 200410089021 CN200410089021 CN 200410089021 CN 200410089021 A CN200410089021 A CN 200410089021A CN 1614918 A CN1614918 A CN 1614918A
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Abstract
The invention consists of multi channel transmitting terminal and multi channel receiving terminal. The multi channel transmitting terminal comprises of M numbers transmitting units arraying in one or two rows. The multi channel receiving terminal comprises of N numbers receiving unit arraying in one or two rows.
Description
Technical field:
The present invention relates to the quantum key distribution transmission in the free space, proposed a kind of based on the multichannel light quantum emission system of polarization encoder and the multichannel light receiving system of decoding based on polarization, the 3 D auto degree of free space and the characteristics of spatial reuse have been brought into play, therefore can realize the agreement of multiple quantum key distribution protocol and many cross-polarization base, have the advantage of the low and integrated assembling of modularization of loss on the structure, can improve the efficient that quantum key is spread greatly.
Background technology:
What the communication plan of quantum-key distribution extensively adopted at present is that BB84 agreement and B92 agreement (are seen: 1.Bennett, C.H., Brassard, G., Proceedings of IEEE International Conference onComputers, Systems and Processing, Bangalore, 1984 (New York:IEEE); 2.Bennett, C.H., Phys Rev Lett, 1992,68 (21): 3121-3124), what other was important also has the entangled photons association to (3.A.K.Ekert, Phys Rev Lett, 1991,67 (6): 661-663 such as agreement and the biased coding protocols that shakes of m; 4.H.P.Yuan, in Quantum Communications, Computations andMeasurements III, Plenum Press, 2001).Comprise the orthogonal state password in addition, the coherent states password, the maximal entangled state quantum cryptography, chnnel coding or the like agreement, the BB84 agreement is abundant but the safety research of these agreements is far from, and realizes having any problem under the current experiments condition.
Polarization encoder BB84 agreement is the most generally to use and most important quantum key distribution implementation method, and the BB84 agreement with four nonopiate polarization state codings is the characteristics of example explanation Optical implementation method below.Launch terminal adopts the laser of four single photon emission, and adopt the polarization state coding that carries out the light emitted light beam with two groups of orthogonal polarization orientation of 45 ° of angles, adopt the palarization multiplexing principle to improve devating prism and Amici prism then and four light beams are merged to become a branch of and be focused into by optical coupler inject Transmission Fibers.Adopt the notion of polarization demultiplexing at the receiving terminal of the other end of optical fiber, at first outgoing beam is divided into the four bundle output polarization light beams that two bundles and then two devating prisms by angle at 45 are divided into two cross-polarization bases, is received by photon counting detector at last by Amici prism.(5.C.H.Bennett，J.Cryptol.，1992，5：3；6.A.Muller，H.Zbinden，N.Gisin，Europhy?Lett，1996，33(5)：335-339；7.P.A.Hiskett，G.Bonfrate，G.S.Buller，et?al.，J.Mod.Opt，2001，48(13)：1957-1966)。This shows that owing to adopt optical fiber to carry out photon transmission, light beam only may carry out the propagation of one dimension direction in optical fiber, spatial degrees of freedom is low and do not have an advantage of spatial reuse.Owing to only adopted polarization encoder, its reusing degree is very low, on optical texture, all need to adopt common unpolarized beam splitter for merging or the decomposition that realizes four road light beams, introduced additional energy loss, therefore for more the merging or the decomposition of the light beam of multichannel will be introduced very big loss, efficient is extremely low, so for many orthogonal basiss quantum key agreement of polarization encoder such as polarization encoder m bit protocol etc. on Optical Implementation hardly may, experimentally polarization encoder m bit protocol has only shown the design and the experimental result of a pair of conjugation polarization state.Also there is similar problem in the Optical Implementation of other variety of protocols of Optical Fiber Transmission, as adopting the B92 protocol method of Mach-Zehnder interferometer phase coding.(8.A.Ekert，Nature，1992，358：14-15；9.C.Marand，P.D.Townsend，Opt?Lett，1995，20(16)：1695-1697；9.E.Cordorf，G.Barbosa，C.Liang，H.P.Yuan，P.Kumar，Opt?Lett，28(21)，2040-2042)。
It is important applied field after Optical Fiber Transmission that the free space quantum key distributes particularly that via satellite quantum key distributes, what use always in free space quantum key compartment system also is the BB84 quantum key agreement of polarization encoder, also adopt devating prism and spectroscope that four light beams are merged into the technical scheme of a light beam at launch terminal, but launch to the receiving terminal direction by transmitter-telescope.Receive and form a light beam at receiving terminal by telescope, be decomposed into four bundle polarised lights by spectroscope and devating prism equally then.(10.B.C.Jacobs，J.D.Franson，Opt?Lett，1996，21(22)：1854-1856；11.J.G.Rarity，P.R.Tapster，P.M.Gorman，et?al，J.Mod.Opt，2001，48(13)：1887-1901；12.R.J.Hughes，J.E.Nordholt，D.Derkacs，et?al，New?J.Phys.2002，4?43；13.J.G.Rarity，P.R.Tapster，P.M.Gorman，P.Knight，New?J.Phys，4，82.1-82.21，2002)。As seen: in free space quantum key location mode, though light beam transmits by free space, but the characteristics of not utilizing transmission of free space three-dimensional and spatial reuse improve the performance of system and improve the quantum key agreement, and the above-mentioned variety of issue that exists in optical fiber transmission of quantum key also exists therefore and equally.
Summary of the invention:
The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, the emission of free space multichannel and the receiving system that provide a kind of quantum key to distribute, it has brought into play the 3 D auto degree and the multiplexing characteristics of space three-dimensional of free space, adopt the multiplexing structure of cross-polarization, can directly apply to quantum key compartment system based on polarization encoder.
Technical solution of the present invention is as follows:
Emission of free space multichannel and receiving system that a kind of quantum key distributes, it is made of multichannel emission terminal and multichannel receiving terminal, and this multichannel emission terminal is made up of M transmitting element (M 〉=1), and it becomes one dimension or two-dimensional arrangements; This multichannel receiving terminal is made up of N receiving element (N 〉=1), and it becomes one dimension or two-dimensional arrangements.
Described M=N.
The formation of described transmitting element: the direction of advancing by light beam, first light path is successively through the first quantum light source, first light source collimating light is learned assembly directive first devating prism, second light path is successively by the second quantum light source, secondary light source collimating optics assembly directive first devating prism, form transmitter-telescope at this first devating prism output light path by transmitter-telescope eyepiece and transmitter-telescope object lens, all said elements are installed in the transmitter unit microscope base, and the polarization state quadrature of the polarization state of the first quantum light source and the second quantum light source and consistent with the polarization direction of the polarization combined light beam of devating prism.
Between described first light source collimating light assembly and first devating prism, also has first polarizer; Between the secondary light source collimating optics assembly and first devating prism, also has second polarizer.
Between described first devating prism and transmitter-telescope eyepiece, also be provided with the first polarization direction circulator and first wave plate.
The structure of described receiving element, constitute by receiving telescope object lens, receiving telescope eyepiece, second devating prism, one road light is surveyed by first photodetector by first convergent lens afterwards, another road light is surveyed by second photodetector by second convergent lens, all said elements are installed in the receiving element microscope base, and described receiving element microscope base has rotating mechanism with respect to installation base.
Between described receiving telescope object lens and receiving telescope eyepiece, be provided with field stop.
Between the receiving telescope eyepiece of described receiving system and second devating prism, be provided with narrowband light filter, second wave plate and the second polarization direction circulator.
Described first wave plate and second wave plate are quarter-wave plate.
The described first polarization direction circulator and the second polarization direction circulator are the crystal polarization apparatuss, or half-wave plate.
The present invention is based on spatial reuse and the multichannel emission system of free space and the receiving system that propose, the 3 D auto degree and the multiplexing characteristics of space three-dimensional of free space have been brought into play, adopt the multiplexing structure of cross-polarization, can directly apply to quantum key compartment system based on polarization encoder.
Description of drawings
Fig. 1 is an overall system light path schematic diagram of the present invention:
Fig. 2 is best Lee of enforcement of transmitter unit of the present invention structural representation:
Fig. 3 is a receiving element most preferred embodiment structural representation of the present invention:
Fig. 4 is the embodiment of the invention, i.e. the structural representation of binary channels palarization multiplexing launch terminal and binary channels polarization demultiplexing receiving terminal.
Among the figure:
1-multichannel emission terminal,
11.1-the first quantum light source, 11.2-first light source collimating light is learned assembly, 11.3-first polarizer,
11.4-the second quantum light source, 11.5-secondary light source collimating optics assembly, 11.6-second polarizer,
11.7-first devating prism, the 11.8-first polarization direction circulator, 11.9-first wave plate,
11.10-the transmitter-telescope eyepiece, 11.11-transmitter-telescope object lens, 11.12-transmitter unit microscope base.
2-multichannel receiving terminal,
21.1-the receiving telescope object lens, the 21.2-field stop, 21.3-receiving telescope eyepiece,
21.4-narrowband light filter, 21.5-second wave plate, the 21.6-second polarization direction circulator,
21.7-second devating prism, 21.8-first convergent lens, 21.9-first photodetector,
21.10-second convergent lens, 21.11-second photodetector, 21.12-transmitter unit microscope base.
1 '-binary channels launch terminal, 2 '-binary channels receiving terminal.
Embodiment:
Also the invention will be further described in conjunction with the accompanying drawings below by embodiment.But should not limit protection scope of the present invention with this.See also Fig. 1 earlier, Fig. 1 is an overall system light path schematic diagram of the present invention, propagates the back from the quantum information of multichannel emission terminal 1 emission through free space and is received by multichannel receiving terminal 2.Multichannel is launched terminal 1 by M transmitting element 11,12,13 ..., 1 (M-1), 1M; M 〉=1 is formed, and it becomes one dimension or two-dimensional arrangements.Multichannel receiving terminal 2 is by N receiving element 21,22,23 ..., 2 (N-1), 2N; N 〉=1 is formed, and it becomes one dimension or two-dimensional arrangements.Generally speaking, M=N.
The structure of described transmitting element is identical, be that example illustrates now with transmitting element 11, transmitting element 11 schematic diagrames see Fig. 2, its course of work is as follows: the light beam that the first quantum light source 11.1 sends is learned assembly 11.2 and first polarizer, 11.3 back directive first devating prisms 11.7 through first light source collimating light, light beam that the second quantum light source 11.4 sends through the secondary light source collimating optics assembly 11.5 and second polarizer 11.6 after also directive first devating prism 11.7, two light beams become a branch of light beam with cross-polarization base after first devating prism 11.7 merges, rotate orthogonal polarisation state by first step polarization direction circulator 11.8 subsequently and by first wave plate 11.9 linear polarization state is converted to elliptical polarization again, transmitter-telescope by forming by transmitter-telescope eyepiece 11.10 and transmitter-telescope object lens 11.11 at last, with light beam directive receiving terminal, all said elements are installed in the transmitter unit microscope base 11.12.
When the first quantum light source 11.1 or the second quantum light source 11.4 had good degree of polarization, first polarizer 11.3 or second polarizer 11.6 could.The necessary quadrature of the polarization state of the polarization state of the first quantum light source 11.1 and the second quantum light source 11.4, and must be consistent with the polarization direction of the polarization combined light beam of first devating prism 11.7, first devating prism 11.7 also can be other various polarization optical elements with orthogonal polarized light beam merging performance, the first polarization direction circulator 11.8 can be crystal polarization apparatus or half-wave plate, first wave plate 11.9 is generally quarter-wave plate, and it should when not needing the elliptical polarization coding.Transmitter unit microscope base 11.12 rotates the α angle with respect to installation base, the rotation of the effect of the first polarization direction circulator 11.8 and transmitter unit microscope base 11.12 all is to produce a polarization direction prebias angle for the cross-polarization coding base to this transmitting element 11, this angle can use the first polarization direction circulator 11.8 or transmitter unit microscope base 11.12 to produce separately, also can unite generation.
The structure of all receiving elements is identical, be that example is illustrated now with receiving element 21, Fig. 3 is a receiving element most preferred embodiment structural representation of the present invention, its structure and operation principle are: pass through by receiving telescope object lens 21.1 from the light beam of launch terminal 1, field stop 21.2 and receiving telescope eyepiece 21.3 receive, and through narrowband light filter 21.4, second wave plate 21.5 and the second polarization direction circulator, 21.6 directives, second devating prism 21.7, second wave plate 21.5 is used for elliptical polarization is converted to linear polarization state, and second devating prism 21.7 becomes two-way with the light beam beam split, lead up to and to survey by first photodetector 21.9 by the first poly-lens 21.8, lead up in addition and can be surveyed by second photodetector 21.11 by the second poly-lens 21.10, all said elements are installed in the receiving element microscope base 21.12.Second wave plate 21.5 is generally quarter-wave plate, it should when not needing the elliptical polarization coding, the second polarization direction circulator 21.6 can be crystal polarization apparatus or half-wave plate, and second devating prism 21.7 also can be other various polarization optical elements with orthogonal polarized light beam merging performance.Receiving element microscope base 21.12 rotates the β angle with respect to installation base, the rotation of the effect of the second polarization direction circulator 21.6 and transmitter unit microscope base 21.12 all is to produce a polarization direction prebias angle for the cross-polarization coding base to this transmitting element, this angle can use the second polarization direction circulator 21.6 or receiving element microscope base 21.12 to produce separately, also can unite generation.Field stop 21.2 is used to limit background noise, and narrowband light filter 21.4 is used to limit the spectrum noise.
If the diameter of the telescope objective of the transmitter unit M in the launch terminal 1 is d
s, launch terminal is arranged by M transmitter unit transmitter-telescope and is formed, and its equivalent emission maximum is of a size of D
sReceiving terminal 2 is arranged by N receiving element receiving telescope and is formed, and its unit bore is d
r, and the maximum of equivalence reception bore is D
rOptical source wavelength is λ.The optical diffraction limit principle limited according to bore, minimum possible luminous exitance (full-shape) θ of launch terminal
sFor:
Therefore in order to guarantee to make the light wave of each transmitter unit 11 in launch terminal 1 can both cover the telescope of each receiving element 21 in the receiving terminal 2, its necessary condition is:
θ
sL≥D
r， (2)
Wherein L is the distance between launch terminal 1 and the receiving terminal 2.
The receiving element 21 of receiving terminal 2 comprises field stop 21.2, and establishing its diameter is d
v, the focal length of receiving telescope object lens 21.1 is f
rIn order to make each receiving element 21 of receiving terminal 2 can both receive the light wave that launch terminal 1 each transmitter unit 11 sends, its necessary condition is:
In transmitter unit shown in Figure 2, can not adopt the palarization multiplexing of the crossed polarized light of two light sources, promptly cancel quantum light source 11.4, secondary light source collimating optics assembly 11.5, second polarizer 11.6 and first devating prism 11.7, make polarized light source of 11 emissions of transmitter unit, substitute the transmitter unit of a palarization multiplexing then on the whole with single polarization transmitter unit of such two polarization direction quadratures.In receiving element shown in Figure 3, can not adopt the polarization demultiplexing of two incident crossed polarized lights, promptly cancel devating prism 21.7, second convergent lens 21.10 and second photodetector 21.11, make receiving element have only a polarization receiver, substitute the receiving element of a polarization demultiplexing then on the whole with single polarization receiving element of such two polarization direction quadratures.
Photon source from launch terminal to the receiving terminal photon transmission, the optical system energy attenuation, how much propagation losss, detector sensitivity or the like problem and consider to belong to traditional algorithm and solve (document 13 sees reference) substantially for the Effect on Performance of communication or distribute keys.
When polarization encoder multichannel optics architecture is used for the quantum key distribution, can reduce system loss effectively and increase operating distance, can be suitable for multiple quantum key agreement and have versatility, particularly can be applicable to the key protocol of many orthogonal basiss and can cut off greatly recruitment sub-key efficiency of transmission and spread distance, these can solve or alleviate the key difficulties problem in the quantum key propagation, and also not having reality as many polarized orthogonals base agreement is embodiment.Palarization multiplexing multichannel optics system structurally adopts the integrated assembling mode of modularization, the optics and the mechanical complexity that can reduce in emission system and the receiving system simple and reliable for structure is equivalent to previous method and reduced that optical element has particularly been cancelled light beam combiner in the launch terminal that has 50% energy loss at least and the beam splitter in the receiving terminal has improved efficient.When multichannel optics architecture is used for realizing simultaneously that the free space key is spread with laser communication, can cut off and improve traffic rate greatly, also availablely more effectively realize secure communication, particularly each passage of multichannel optics structure can be born different functions, as laser communication, optical acquisition and thick the tracking, perhaps precision optics is followed the tracks of, and at this moment can improve the performance of laser space communication terminal widely.
Suppose: propagate quantum key earthward from low orbit satellite, star ground distance is 200km, adopts BB84 key propagation protocol.Adopt embodiment shown in Figure 4, promptly be used for the dual channel system light path schematic diagram of polarization encoder BB84 agreement
What the BB84 scheme adopted is 45 ° of two groups of crossing cross-polarization bases, so launch terminal and receiving terminal are 2 channel multiplexings, i.e. M=N=2.45 ° of prebias angles of the polarization direction of transmitter unit and receiving element all use microscope base rotation in unit to produce separately, so launch terminal and receiving terminal do not need the wave plate of polarization direction circulator and conversion elliptical polarization.The first quantum light source 11.1 and the second quantum light source 11.4 all adopt the accurate single photon semiconductor laser diode of 800nm wavelength, because good degree of polarization is arranged itself, therefore do not use first polarizer 11.3 and second polarizer 11.6 in transmitter unit.
Transmitter-telescope object lens 11.11 bores of design transmitter unit 11 are φ 100mm, and then the diffraction limit angle of departure is about 20 μ rad, and the emission of the maximum equivalent of launch terminal 1 is of a size of 200mm.If the bore of the telescope objective 21.1 of the receiving element 21 of receiving terminal 2 is φ 200mm, focal length 600mm, the bore φ 0.036mm of field stop 21.2, then the angle of visual field of the receiving element 21 of receiving terminal 2 is 60 μ rad, and the maximum bore that receives of equivalence is about 400mm.Therefore according to the calculating of formula (1)-(3), the emission light beam is φ 4M at the diameter of the coverage rate of receiving terminal 2, greater than the maximum bore 400mm that receives of the equivalence of receiving terminal; What the visual field of transmitter unit was equivalent to receiving terminal can be of a size of φ 12M by receiving area, greater than the equivalent emission maximum size 200mm of launch terminal.
Be simplified system, and make the optical element structure size of the same function in transmitter unit and the receiving element identical, the diameter of the relaying collimated light beam that transmits in transmitter unit and receiving element all is designed to bore φ 8mm, therefore the telescopical enlargement ratio of transmitter unit is 12.5, and the telescopical enlargement ratio of receiving element is 25.
Claims (10)
1, a kind of emission of free space multichannel and receiving system of quantum key distribution is characterized in that it launches terminal (1) by multichannel and multichannel receiving terminal (2) constitutes, and this multichannel emission terminal (1) is by M transmitting element (1.1,1.2,1.3 ... 1.M-1,1.M; M 〉=1) form, it becomes one dimension or two-dimensional arrangements; This multichannel receiving terminal (2) by N receiving element (2.1,2.2,2.3 ..., 2.N-1,2.N; N 〉=1) form, it becomes one dimension or two-dimensional arrangements.
2, the emission of free space multichannel and the receiving system of quantum key distribution according to claim 1 is characterized in that described M=N.
3, emission of free space multichannel and receiving system that quantum key according to claim 1 distributes, the formation that it is characterized in that described transmitting element (11): the direction of advancing by light beam, first light path is learned assembly (11.2) directive first devating prism (11.7) through the first quantum light source (11.1) and first light source collimating light successively, second light path successively by the second quantum light source (11.4) through secondary light source collimating optics assembly (11.5) directive first devating prism (11.7), the transmitter-telescope of forming by transmitter-telescope eyepiece (11.10) and transmitter-telescope object lens (11.11) in the light path of first devating prism (11.7) output, all said elements are installed in the transmitter unit microscope base (11.12), and the polarization state quadrature of the polarization state of the first quantum light source (11.1) and the second quantum light source (11.4) and consistent with the polarization direction through the polarization combined light beam of first devating prism (11.7).
4, the emission of free space multichannel and the receiving system of quantum key distribution according to claim 3 is characterized in that also having first polarizer (11.3) between described first light source collimating light assembly (11.2) and first devating prism (11.7); Between secondary light source collimating optics assembly (11.5) and first devating prism (11.7), also has second polarizer (11.6).
5, the emission of free space multichannel and the receiving system of quantum key distribution according to claim 3 is characterized in that also being provided with the first polarization direction circulator (11.8) and first wave plate (11.9) between described first devating prism (11.7) and transmitter-telescope eyepiece (11.10).
6, emission of free space multichannel and receiving system that quantum key according to claim 3 distributes, it is characterized in that structure in described receiving element (21), by receiving telescope object lens (21.1), receiving telescope eyepiece (21.3), second devating prism (21.7) constitutes, one road light is surveyed by first photodetector (21.9) by first convergent lens (21.8) afterwards, another road light is surveyed by second photodetector (21.11) by second convergent lens (21.10), all said elements are installed in the receiving element microscope base (21.12), and described receiving element microscope base (21.12) has rotating mechanism with respect to installation base.
7, the emission of free space multichannel and the receiving system of quantum key distribution according to claim 6 is characterized in that being provided with field stop (21.2) described between receiving telescope object lens (21.1) and receiving telescope eyepiece (21.3).
8, the emission of free space multichannel and the receiving system of quantum key distribution according to claim 6, it is characterized in that between described receiving telescope eyepiece (21.3) and second devating prism (21.7), being provided with narrowband light filter (21.4) second wave plate (21.5) and the second polarization direction circulator (21.6).
9, according to the emission of free space multichannel and the receiving system of claim 3 or 6 described quantum keys distributions, it is characterized in that described first wave plate (11.9) and second wave plate (21.5) are quarter-wave plate.
10, launch and receiving system according to the free space multichannel of claim 3 or 6 described quantum keys distributions, it is characterized in that the described first polarization direction circulator (11.8) and the second polarization direction circulator (21.6) they are the crystal polarization apparatuss, or half-wave plate.
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| CN 200410089021 CN1614918A (en) | 2004-12-02 | 2004-12-02 | Quantum pin distributed free space multi-chnnel transmitting and receiving system |
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| WO2007033561A1 (en) * | 2005-09-19 | 2007-03-29 | The Chinese University Of Hong Kong | System and method for quantum key distribution over wdm links |
| WO2007033560A1 (en) * | 2005-09-19 | 2007-03-29 | The Chinese University Of Hong Kong | Method and system for quantum key distribution over multi-user wdm network with wavelength routing |
| CN101207628B (en) * | 2006-12-19 | 2012-11-07 | 日本电气株式会社 | Method and system for managing shared information |
| CN102957533A (en) * | 2011-08-25 | 2013-03-06 | 安徽量子通信技术有限公司 | Code modulation device of quantum key distribution system |
| CN101176297B (en) * | 2005-05-17 | 2014-09-03 | 朗迅科技公司 | Multi-channel transmission of quantum information |
| CN107437995A (en) * | 2016-05-27 | 2017-12-05 | 西安电子科技大学 | Satellite-based wide area quantum communication network system and communication means |
| CN110568540A (en) * | 2019-08-13 | 2019-12-13 | 武汉大学 | micro-nano wave plate array with double-image display function and construction method thereof |
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| CN101176297B (en) * | 2005-05-17 | 2014-09-03 | 朗迅科技公司 | Multi-channel transmission of quantum information |
| WO2007033560A1 (en) * | 2005-09-19 | 2007-03-29 | The Chinese University Of Hong Kong | Method and system for quantum key distribution over multi-user wdm network with wavelength routing |
| US7639947B2 (en) | 2005-09-19 | 2009-12-29 | The Chinese University Of Hong Kong | System and methods for quantum key distribution over WDM links |
| US7826749B2 (en) | 2005-09-19 | 2010-11-02 | The Chinese University Of Hong Kong | Method and system for quantum key distribution over multi-user WDM network with wavelength routing |
| US8050566B2 (en) | 2005-09-19 | 2011-11-01 | The Chinese University Of Hong Kong | System and methods for quantum key distribution over WDM links |
| CN101208890B (en) * | 2005-09-19 | 2012-03-28 | 香港中文大学 | Methods and system for quantum key distribution over multi-user WDM network with wavelength routing |
| WO2007033561A1 (en) * | 2005-09-19 | 2007-03-29 | The Chinese University Of Hong Kong | System and method for quantum key distribution over wdm links |
| CN101207628B (en) * | 2006-12-19 | 2012-11-07 | 日本电气株式会社 | Method and system for managing shared information |
| CN102957533A (en) * | 2011-08-25 | 2013-03-06 | 安徽量子通信技术有限公司 | Code modulation device of quantum key distribution system |
| CN102957533B (en) * | 2011-08-25 | 2015-02-04 | 安徽量子通信技术有限公司 | Code modulation device of quantum key distribution system |
| CN107437995A (en) * | 2016-05-27 | 2017-12-05 | 西安电子科技大学 | Satellite-based wide area quantum communication network system and communication means |
| CN110568540A (en) * | 2019-08-13 | 2019-12-13 | 武汉大学 | micro-nano wave plate array with double-image display function and construction method thereof |
| CN110568540B (en) * | 2019-08-13 | 2020-12-18 | 武汉大学 | Micro-nano wave plate array with double-image display function and construction method thereof |
| CN113517928A (en) * | 2021-04-26 | 2021-10-19 | 长春理工大学 | All-optical capturing method and device applied to space laser communication |
| CN113517928B (en) * | 2021-04-26 | 2022-03-25 | 长春理工大学 | All-optical capturing method and device applied to space laser communication |
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