Cooperative system and method based on Dammann grating multichannel quantum communication

Abstract

The invention discloses a cooperative system based on Dammann grating multichannel quantum communication. The cooperative system comprises an intelligent platform center, a quantum key management cloud platform, a Dammann grating and a plurality of local user sides, the quantum key management cloud platform comprises a quantum key detection end and a detection result sending end; the local user side comprises a local wisdom sub-platform and a quantum key sending end; the invention also provides a cooperation method based on Dammann grating multichannel quantum communication, which is realized based on the cooperation system based on Dammann grating multichannel quantum communication. The invention discloses a cooperation system and method based on Dammann grating multichannel quantum communication, and the system and method improve the communication safety of an intelligent platform through the combination of the intelligent platform and a quantum communication link. And moreover, multi-channel quantum communication is realized through the Dammann grating, and the Dammann grating can be compatible with the existing optical fiber network, so that the Dammann grating is easier to deploy and use in an actual scene.

Description

Technical Field

[0001] The present invention relates to the field of quantum communication network and information security technology, and in particular to a collaborative system and method based on Dammann grating multi-channel quantum communication. Background Art

[0002] At present, the classical cryptographic system has suffered from the impact of quantum computing, which enables computers to perform calculations in a more efficient way than traditional computers, thus posing a threat to the classical cryptographic system. The Quantum Key Distribution (QKD) protocol is based on the basic principles of quantum mechanics and has higher security than classical communication. QKD technology can ensure that remote parties can exchange keys securely. Although it has been theoretically proven that QKD technology has unconditional security, it is still difficult to ensure the security of the communication system when it is implemented in actual devices, because various equipment defects still need to be considered.

[0003] The Twin-Field Quantum Key Distribution (TF-QKD) protocol can effectively circumvent all vulnerabilities in the measurement end of the QKD system. Since TF-QKD was proposed, many achievements have been made in theory and experiment, and it can be used in communication scenarios with long-distance requirements. The TF-QKD protocol has a higher key generation rate and a longer security distance, which makes TF-QKD more practical and feasible in real-world scenarios. In addition, TF-QKD is compatible with existing fiber optic networks, which makes it easier to deploy and use in actual scenarios, further improving the practicality of quantum communication systems.

[0004] However, there is currently no plan to apply quantum communication technology to the smart platform center. Relying solely on the classical cryptographic system, the communication security of the smart platform center is difficult to guarantee. Summary of the invention

[0005] In order to solve the problem that the communication security of the current intelligent platform center is difficult to ensure, the present invention proposes a collaborative system and method based on Dammann grating multi-channel quantum communication.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A collaborative system based on Dammann grating multi-channel quantum communication, including an intelligent platform center, a quantum key management cloud platform, Dammann gratings and multiple local user terminals;

[0008] The quantum key management cloud platform includes a quantum key detection end and a detection result sending end;

[0009] The local user terminal includes a local smart sub-platform and a quantum key sending terminal;

[0010] The local smart sub-platform of one of the communicating parties requests communication from the smart platform center, and the smart platform center transmits the communication instruction to the key management cloud platform. After receiving the request, the key management cloud platform informs the local smart sub-platform of the other communicating party;

[0011] The local user terminals of the communicating parties respectively send out single-photon signals with different orbital angular momentum through their quantum key sending terminals. The single-photon signals enter the Dammann grating through the quantum channel. The Dammann grating multiplexes the single-photon signals and transmits them to the quantum key detection terminal of the quantum key management cloud platform for detection. The detection results are transmitted to the detection result sending terminal, and the detection result sending terminal informs the local smart sub-platforms of the communicating parties of the detection results. The local smart sub-platforms of the communicating parties generate security keys after QKD post-processing, and realize quantum communication through the generated security keys.

[0012] In the above scheme, the communication security of the smart platform is improved by combining the smart platform and the quantum communication link; and multi-channel quantum communication is achieved through the Dammann grating, which is compatible with the existing optical fiber network and is therefore easier to deploy and use in actual scenarios.

[0013] Preferably, the quantum key transmitter comprises a laser light source, an intensity modulator, a phase modulator, a spatial light modulator and an adjustable optical attenuator connected in sequence;

[0014] The output end of the adjustable optical attenuator is connected to the quantum key detection end through the Dammann grating.

[0015] Preferably, the quantum key sending end further includes a random number generator;

[0016] The output end of the random number generator is connected to the input end of the intensity modulator and the input end of the phase modulator respectively.

[0017] Preferably, the quantum key detection end comprises a beam splitter, a first single-photon detector and a second single-photon detector;

[0018] The output end of the adjustable optical attenuator is connected to the input end of the beam splitter through the Dammann grating, the output end of the beam splitter is respectively connected to the input end of the first single-photon detector and the input end of the second single-photon detector, and the output end of the first single-photon detector and the output end of the second single-photon detector are respectively connected to the detection result sending end.

[0019] Preferably, the Dammann grating is a one-dimensional Dammann grating, a two-dimensional Dammann grating or a three-dimensional Dammann grating.

[0020] Preferably, the quantum key management cloud platform also includes a quantum gateway;

[0021] The quantum gateway is connected to the smart platform center and the quantum key detection terminal respectively.

[0022] Preferably, the local intelligent sub-platform is connected to the quantum gateway via a classical channel.

[0023] Preferably, the local smart sub-platform is connected to the smart platform center through a classical channel.

[0024] Preferably, the quantum key management cloud platform also includes a quantum data management module;

[0025] The quantum data management module is connected to the quantum key detection terminal.

[0026] A collaborative method based on Dammann grating multi-channel quantum communication is implemented based on the collaborative system based on Dammann grating multi-channel quantum communication, comprising the following steps:

[0027] S1: The local smart sub-platform of one of the communicating parties requests communication from the smart platform center;

[0028] S2: The smart platform center transmits communication instructions to the key management cloud platform;

[0029] S3: After receiving the request, the key management cloud platform notifies the local smart sub-platform of the other communication party;

[0030] S4: Both communicating parties send out single photon signals with different orbital angular momentum through their quantum key transmitters;

[0031] S5: The single-photon signal enters the Dammann grating through the quantum channel, and the Dammann grating multiplexes and transmits the single-photon signal to the quantum key detection end for detection to obtain the detection result;

[0032] S6: The detection result is transmitted to the detection result sending end, and the detection result sending end notifies the local smart sub-platforms of the communicating parties of the detection result;

[0033] S7: The local smart sub-platforms of the communicating parties generate security keys through QKD post-processing, and quantum communication is achieved through the generated security keys.

[0034] Beneficial technical effects of the present invention:

[0035] The present invention provides a collaborative system and method based on Dammann grating multi-channel quantum communication, which improves the communication security of the smart platform by combining the smart platform and the quantum communication link. In addition, multi-channel quantum communication is achieved through Dammann grating, which is compatible with existing optical fiber networks and is therefore easier to deploy and use in actual scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is the overall structural diagram of the present invention;

[0037] Figure 2 This is a schematic diagram of the module connection of the quantum key sending end in the present invention;

[0038] Figure 3 It is a schematic diagram of the structure of the quantum key detection end in the present invention;

[0039] Figure 4 It is a flowchart of the implementation steps of the technical solution of the present invention;

[0040] Among them: 100, smart platform center; 200, quantum key management cloud platform; 210, quantum key detection end; 211, beam splitter; 212, first single photon detector; 213, second single photon detector; 220, detection result sending end; 230, quantum gateway; 240, quantum data management module; 300, local user end; 310, local smart sub-platform; 320, quantum key sending end; 321, laser light source; 322, intensity modulator; 323, phase modulator; 324, spatial light modulator; 325, adjustable optical attenuator; 326, random number generator; 400, Dammann grating. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments, but the scope of protection claimed in the present invention is not limited to the following specific embodiments.

[0042] Example 1

[0043] like Figure 1-3 As shown, a collaborative system based on Dammann grating multi-channel quantum communication includes a smart platform center 100, a quantum key management cloud platform 200, a Dammann grating 400 and multiple local user terminals 300;

[0044] The quantum key management cloud platform 200 includes a quantum key detection terminal 210 and a detection result sending terminal 220;

[0045] The local user terminal 300 includes a local smart sub-platform 310 and a quantum key sending terminal 320;

[0046] The local smart sub-platform 310 of one of the communicating parties requests communication from the smart platform center 100, and the smart platform center 100 transmits the communication instruction to the key management cloud platform. After receiving the request, the key management cloud platform informs the local smart sub-platform 310 of the other communicating party;

[0047] The local user terminals 300 of the communicating parties respectively send out single-photon signals with different orbital angular momentum through their quantum key transmitting terminals 320. The single-photon signals enter the Dammann grating 400 through the quantum channel. The Dammann grating 400 multiplexes and transmits the single-photon signals to the quantum key detection terminal 210 of the quantum key management cloud platform 200 for detection. The obtained detection results are transmitted to the detection result transmitting terminal 220, and the detection result transmitting terminal 220 informs the local smart sub-platforms 310 of the communicating parties of the detection results. The local smart sub-platforms 310 of the communicating parties generate security keys after QKD post-processing, and realize quantum communication through the generated security keys.

[0048] In the specific implementation process, the communication security of the smart platform is improved by combining the smart platform and the quantum communication link; and multi-channel quantum communication is achieved through the Dammann grating 400, which is compatible with the existing optical fiber network, making it easier to deploy and use in actual scenarios.

[0049] More specifically, the quantum key transmitter 320 includes a laser light source 321, an intensity modulator 322, a phase modulator 323, a spatial light modulator 324 and an adjustable optical attenuator 325 connected in sequence;

[0050] The output end of the adjustable optical attenuator 325 is connected to the quantum key detection end 210 through the Dammann grating 400 .

[0051] In the specific implementation process, the laser light emitted by the laser light source 321 is intensity modulated by the intensity modulator 322, and then phase modulated by the phase modulator 323, wherein the modulation coefficient is determined by the random number generator 326; finally, the modulated signal light is processed by the adjustable optical attenuator 325, and the signal light is attenuated to the single photon level, and enters the quantum key detection end 210 in the quantum key management cloud platform 200 through the Dammann grating 400 for detection. By adopting the dual-field quantum key distribution technology, it has a higher key generation rate and a longer security distance.

[0052] More specifically, the quantum key transmitter 320 further includes a random number generator 326;

[0053] The output end of the random number generator 326 is connected to the input end of the intensity modulator 322 and the input end of the phase modulator 323 respectively.

[0054] More specifically, the quantum key detection end 210 includes a beam splitter 211, a first single-photon detector 212, and a second single-photon detector 213;

[0055] The output end of the adjustable optical attenuator 325 is connected to the input end of the beam splitter 211 through the Dammann grating 400, and the output end of the beam splitter 211 is respectively connected to the input end of the first single-photon detector 212 and the input end of the second single-photon detector 213, and the output end of the first single-photon detector 212 and the output end of the second single-photon detector 213 are respectively connected to the detection result sending end 220.

[0056] In a specific implementation process, after the signal light enters the beam splitter 211 , it is detected on the first single-photon detector 212 and the second single-photon detector 213 .

[0057] More specifically, the Dammann grating 400 is a one-dimensional Dammann grating, a two-dimensional Dammann grating, or a three-dimensional Dammann grating.

[0058] In the specific implementation process, the eigenstates of the orbital angular momentum of photons mathematically constitute a set of complete orthogonal basis vectors, so orbital angular momentum can be used to realize high-dimensional information encoding. The state containing orbital angular momentum can be expressed as:

[0059]

[0060] in, represents the relative phase used for encoding, b A,B ∈{0,π} where 0 and π represent 0 and 1 in the code respectively.

[0061] The spatial light modulator 324 carries different diffraction angles due to different orbital angular momentum orders, and is then emitted to the corresponding measuring device by the Dammann grating 400. The orbital angular momentum detectable by the Dammann grating 400 can be selected in a one-dimensional, two-dimensional or three-dimensional array structure, which increases with the number of users.

[0062] In practice, the Dammann grating 400 demultiplexes the collinearly transmitted orbital angular momentum multiplexing signal along different diffraction orders. The diffraction angle, i.e. the corresponding order, can be expanded in array form. Currently, there are one-dimensional, two-dimensional and three-dimensional Dammann gratings. Using the vortex phase of the traditional vortex grating as the main body and the Dammann structure to form a one-dimensional vortex Dammann grating, the complex amplitude distribution is obtained:

[0063]

[0064] Among them, E nx represents the normalized energy of the nth diffraction order relative to the total energy, l x represents the topological charge interval carried by the vortex Dammann grating in the x direction, is the spatial phase angle, the grating period T determines the diffraction angle, n x represents the diffraction order in the x direction.

[0065] At this time, the topological charge order carried by the complex amplitude of each diffraction order is completely determined by n x l x The term determines that since this term is related to the diffraction order n x The diffraction energy in the N orders of the Dammann grating 400 is equally divided, which solves the detection problem of high-order weak signals in traditional gratings. Therefore, the dynamic range of orbital angular momentum channel detection is improved by the Dammann grating 400. The incident coaxial OV beam carrying a large number of orbital angular momentum channels can be demultiplexed in parallel by a single Dammann grating 400, without the need for additional optical splitters or complex computer-generated holography in the detection system.

[0066] Therefore, the network system of orbital angular momentum multiplexing and demultiplexing is implemented by spatial light modulator 324 and Dammann grating 400. The orbital angular momentum multiplexing numbers generated by spatial light modulator 324 correspond to N local user terminals 300, and can be increased as the number of local user terminals 300 increases.

[0067] More specifically, the quantum key management cloud platform 200 further includes a quantum gateway 230;

[0068] The quantum gateway 230 is connected to the smart platform center 100 and the quantum key detection terminal 210 respectively.

[0069] More specifically, the local intelligent sub-platform 310 is connected to the quantum gateway 230 via a classical channel.

[0070] More specifically, the local smart sub-platform 310 is connected to the smart platform center 100 via a classical channel.

[0071] More specifically, the quantum key management cloud platform 200 also includes a quantum data management module 240;

[0072] The quantum data management module 240 is connected to the quantum key detection end 210 .

[0073] In a specific implementation process, quantum data is managed / stored through the quantum data management module 240 .

[0074] Example 3

[0075] like Figure 4 As shown, a collaborative method based on Dammann grating multi-channel quantum communication is implemented based on the collaborative system based on Dammann grating multi-channel quantum communication, comprising the following steps:

[0076] S1: The local smart sub-platform of one of the communicating parties requests communication from the smart platform center;

[0077] S2: The smart platform center transmits communication instructions to the key management cloud platform;

[0078] S3: After receiving the request, the key management cloud platform notifies the local smart sub-platform of the other communication party;

[0079] S4: Both communicating parties send out single photon signals with different orbital angular momentum through their quantum key transmitters;

[0080] S5: The single-photon signal enters the Dammann grating through the quantum channel, and the Dammann grating multiplexes and transmits the single-photon signal to the quantum key detection end for detection to obtain the detection result;

[0081] S6: The detection result is transmitted to the detection result sending end, and the detection result sending end notifies the local smart sub-platforms of the communicating parties of the detection result;

[0082] S7: The local smart sub-platforms of the communicating parties generate security keys through QKD post-processing, and quantum communication is achieved through the generated security keys.

[0083] Example 3

[0084] This embodiment takes two users (local user terminal A and local user terminal B) as an example to illustrate the specific process of key distribution.

[0085] Each local user end announces through the classical channel that the phase interval (0, 2π) is divided into M phase slices. k=0,1,...,M-1.

[0086] Local user terminal A and local user terminal B send strong light whose intensity and phase are not modulated but modulated by the spatial light modulator through the Dammann grating and the quantum channel to the key management cloud platform, so that it can calibrate the overall phase stable channel and reduce the phase mismatch. Then, local user terminal A and local user terminal B attenuate the intensity of the light pulse to the single photon level and modulate the phase and intensity. The phase and intensity modulation parameters are controlled by the random number generator, where the basis vector phase β is set a,b ∈{0,π / 2} corresponds to the basis {X,Y}, where the local user end A modulates the phase and intensity to α a and μ a , the modulation phase and intensity of local user end B are α b and μ b The outgoing photons pass through the Dammann grating and enter the key receiving detection end of the key management cloud platform for detection.

[0087] The key management cloud platform publishes all rounds of probe response results through the probe result sender. Local user terminal A and local user terminal B set the variable K=0(π) according to which probe responds; both no response and double response events are discarded.

[0088] The local user terminal A announces the intensity μ used through the classical channel a , base phase β a , Phase plate Δ k(a) ; The local user terminal B then announces which rounds have matching parameters and discards the unmatched rounds; then they announce the bit values ​​in the matching rounds except for the signal state X basis.

[0089] To generate bits on the basis of signal state X, local user terminal B uses the relationship K = |α a -α b |To get the bit phase α of local user terminal A a ; Local user terminal A and local user terminal B through α a =0(π) to generate bit 0(1); the previously published bits are used to estimate the decoy state parameters, and the measurement results are shown in Table 1.

[0090]

[0091] Local user terminal A and local user terminal B can obtain the original key based on the detection response. Finally, both parties perform post-processing, including monitoring detection, error analysis, and privacy amplification, and finally generate a secure key.

[0092] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also change and modify the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience and do not constitute any limitation to the present invention.

Claims

1. A collaborative system based on Dammann grating multi-channel quantum communication, characterized in that: Including the smart platform center, quantum key management cloud platform, Dammann grating and multiple local user terminals; The quantum key management cloud platform includes a quantum key detection end and a detection result sending end; The local user terminal includes a local smart sub-platform and a quantum key sending terminal; The local smart sub-platform of one of the communicating parties requests communication from the smart platform center, and the smart platform center transmits the communication instruction to the key management cloud platform. After receiving the request, the key management cloud platform informs the local smart sub-platform of the other communicating party; The local user terminals of the communicating parties respectively send out single-photon signals with different orbital angular momentum through their quantum key sending terminals. The single-photon signals enter the Dammann grating through the quantum channel. The Dammann grating multiplexes the single-photon signals and transmits them to the quantum key detection terminal of the quantum key management cloud platform for detection. The detection results are transmitted to the detection result sending terminal, and the detection result sending terminal informs the local smart sub-platforms of the communicating parties of the detection results. The local smart sub-platforms of the communicating parties generate security keys after QKD post-processing, and realize quantum communication through the generated security keys.

2. A collaborative system based on Dammann grating multi-channel quantum communication according to claim 1, characterized in that: The quantum key transmitting end comprises a laser light source, an intensity modulator, a phase modulator, a spatial light modulator and an adjustable optical attenuator which are connected in sequence; The output end of the adjustable optical attenuator is connected to the quantum key detection end through the Dammann grating.

3. A collaborative system based on Dammann grating multi-channel quantum communication according to claim 2, characterized in that: The quantum key sending end also includes a random number generator; The output end of the random number generator is connected to the input end of the intensity modulator and the input end of the phase modulator respectively.

4. A collaborative system based on Dammann grating multi-channel quantum communication according to claim 2, characterized in that: The quantum key detection end includes a beam splitter, a first single-photon detector and a second single-photon detector; The output end of the adjustable optical attenuator is connected to the input end of the beam splitter through the Dammann grating, the output end of the beam splitter is respectively connected to the input end of the first single-photon detector and the input end of the second single-photon detector, and the output end of the first single-photon detector and the output end of the second single-photon detector are respectively connected to the detection result sending end.

5. A collaborative system based on Dammann grating multi-channel quantum communication according to claim 1, characterized in that: The Dammann grating is a one-dimensional Dammann grating, a two-dimensional Dammann grating or a three-dimensional Dammann grating.

6. A collaborative system based on Dammann grating multi-channel quantum communication according to claim 1, characterized in that: The quantum key management cloud platform also includes a quantum gateway; The quantum gateway is connected to the smart platform center and the quantum key detection terminal respectively.

7. A collaborative system based on Dammann grating multi-channel quantum communication according to claim 6, characterized in that: The local intelligent sub-platform is connected to the quantum gateway via a classical channel.

8. A collaborative system based on Dammann grating multi-channel quantum communication according to claim 1, characterized in that: The local smart sub-platform is connected to the smart platform center through a classic channel.

9. A collaborative system based on Dammann grating multi-channel quantum communication according to claim 1, characterized in that: The quantum key management cloud platform also includes a quantum data management module; The quantum data management module is connected to the quantum key detection terminal.

10. A collaborative method based on Dammann grating multi-channel quantum communication, characterized in that: The following steps are involved: S1: The local smart sub-platform of one of the communicating parties requests communication from the smart platform center; S2: The smart platform center transmits communication instructions to the key management cloud platform; S3: After receiving the request, the key management cloud platform notifies the local smart sub-platform of the other communication party; S4: Both communicating parties send out single photon signals with different orbital angular momentum through their quantum key transmitters; S5: The single-photon signal enters the Dammann grating through the quantum channel, and the Dammann grating multiplexes and transmits the single-photon signal to the quantum key detection end for detection to obtain the detection result; S6: The detection result is transmitted to the detection result sending end, and the detection result sending end notifies the local smart sub-platforms of the communicating parties of the detection result; S7: The local smart sub-platforms of the communicating parties generate security keys through QKD post-processing, and quantum communication is achieved through the generated security keys.

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