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Polarization code-based long-distance quantum key distribution method and system for power system

A quantum key distribution and power system technology, applied in the field of quantum secure communication, can solve the problems of low coding rate, high bit error rate, and low coding rate, so as to reduce the key bit error rate and improve the coding rate , strong practical effect

Pending Publication Date: 2022-05-27
国网新疆电力有限公司信息通信公司 +2
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  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of low coding rate caused by long-distance overhead optical cable communication in power systems, the present invention proposes a polar code-based long-distance quantum key distribution method for power systems, which fully meets the requirements of quantum encryption in long-distance overhead environments in power systems. Key distribution requirements, solve the problems of high bit error rate and low coding rate caused by long-distance overhead optical cable communication in power system, further improve error correction success rate and negotiation efficiency, and ensure the coding rate of long-distance overhead optical cable communication in power system Stablize

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  • Polarization code-based long-distance quantum key distribution method and system for power system
  • Polarization code-based long-distance quantum key distribution method and system for power system
  • Polarization code-based long-distance quantum key distribution method and system for power system

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Embodiment 1

[0032] Embodiment 1. A polar code-based long-distance quantum key distribution method for a power system, comprising the following steps:

[0033] In the long-distance quantum key distribution scheme of the power system, the sender first determines the phase component p according to the A and the amplitude component x A Prepare coherent state |x A +ip A > and sent to the receiver. After receiving the coherent state sent by the transmitting end, the receiving end randomly detects the phase component or amplitude component of the coherent state. The transmitting end and the receiving end announce to each other whether the measured component is the phase component or the amplitude component through the common channel, and the transmitting end and the receiving end only keep the bits of the same component announced by both parties as the key. By repeating the above process multiple times, a sufficiently long continuous variable key string X and Y can be obtained between the send...

Embodiment 2

[0043] Embodiment 2. A method for long-distance quantum key distribution of a power system based on a polar code. On the basis of the above embodiment, the method provided in this embodiment further includes: establishing a virtual channel at the transmitting end and the receiving end ; Described method also comprises: communication both parties are known to freeze bit position U c and the frozen bit value u c , then use the transmission bit flip information polar code error correction negotiation mechanism to correct the error of the key. If both communicating parties know the freeze bit position U c and the frozen bit value u c , under this design idea, the efficiency of CV-QKD multi-dimensional negotiation can be improved by providing more side information, thereby improving the key generation rate.

[0044] In the polar code error correction negotiation mechanism for transmitting bit flip information, both parties of the communication know the frozen bit position U c a...

Embodiment 3

[0054] Embodiment 3. A method for long-distance quantum key distribution of a power system based on a polar code. On the basis of the above embodiment, the method provided in this embodiment further includes: if the method further includes: if using The screening bits transmitted on the quantum channel have sparse characteristics, and the polar code error correction negotiation mechanism that retains the bit flip information of the qubit transmission is used to correct the error of the key (such as Figure 4 shown).

[0055] Using the sparse characteristics of the screening bits transmitted on the quantum channel, the key rate can be greatly improved by sending more side information in the classical channel, forming a polar code error correction negotiation mechanism that retains the bit flip information of qubit transmission. Schematic such as Figure 4 shown.

[0056] The working principle of the polar code error correction negotiation mechanism that preserves the bit flip...

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Abstract

The invention provides a polarization code-based long-distance quantum key distribution method and system for a power system, and the method comprises the steps: introducing a polarization code into a multi-dimensional negotiation protocol of continuous variable quantum key distribution; comprising the steps of proposing a polarization code error correction negotiation mechanism for transmitting frozen bits, a polarization code error correction negotiation mechanism for transmitting bit flipping information and a polarization code error correction negotiation mechanism for reserving quantum bits and transmitting the bit flipping information to carry out error correction on a secret key. According to the method, the bit error rate of the key can be better reduced, the code forming rate of the long-distance quantum key is improved, the application scene of the quantum secret communication technology in the power system service is enriched, and the practicability is higher.

Description

technical field [0001] The invention discloses a long-distance quantum key distribution method for a power system based on polar codes, and relates to the field of quantum secure communication. Background technique [0002] In the Quantum Key Distribution (QKD) protocol, both parties in the communication can obtain their own original keys after the generation, transmission and measurement of quantum signals. Since the BB84 protocol was proposed, QKD technology has developed by leaps and bounds. However, in actual network communication, due to the interference of external factors such as equipment and environment, as well as the eavesdropping of attackers, some errors will occur in the original keys obtained by both parties. Therefore, it is crucial to perform information negotiation and private amplification on the original key before preparing an error-free security key. [0003] According to the difference of the transmission quantum state, the QKD protocol mainly includ...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04L1/00
CPCH04L9/0852H04L9/0861H04L9/0869H04L9/0838H04L9/085H04L1/0057H04L1/0061Y04S40/20
Inventor 周文婷刘杰叶潇李阳罗永玲卞宇翔冯宝
Owner 国网新疆电力有限公司信息通信公司