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Quantum key distribution method and system with free side channels

A quantum key distribution and side channel technology, applied in the field of quantum key distribution, can solve problems such as information leakage and affect the security of quantum key distribution protocol, and achieve simple protocol equipment, simplified experimental equipment requirements, and high coding rate. Effect

Active Publication Date: 2021-09-24
NANJING UNIV
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Problems solved by technology

[0003]However, for the quantum key distribution protocol proposed at this stage, it is necessary to strictly control the parameters of the signal state sent by the trusted sender. If the sender sends The signal state and the theoretically set signal state do not perfectly match, which will lead to additional unmonitorable information leakage and affect the security of the quantum key distribution protocol

Method used

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  • Quantum key distribution method and system with free side channels
  • Quantum key distribution method and system with free side channels
  • Quantum key distribution method and system with free side channels

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Embodiment 1

[0044] A side-channel free quantum key distribution system proposed in this embodiment, such as image 3 As shown, it includes two sending ends and one measuring equipment end.

[0045] The sending end includes a coherent light source and a modulation module, the coherent light source is used to generate coherent light pulses, the modulation module includes a phase modulation unit, a random number generator and an optical attenuation unit, and the random number generator and phase modulation unit are used for coherent light pulses Random phase modulation and coded phase modulation are performed, and the optical attenuation unit is used to generate weakly coherent optical pulses; the measurement equipment end includes an interference module and a measurement module, wherein the interference module is used to interfere with the received weakly coherent optical pulses, and the measurement module Two detectors are included for corresponding responses to the results of the interfer...

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Abstract

The invention discloses a quantum key distribution method and system with free side channels, and belongs to the technical field of quantum key distribution. Aiming at the defects in the prior art, the invention provides the quantum key distribution method and system with free side channels, a quantum key distribution protocol sending end provided by the scheme only needs to use weak coherent optical pulses. Meanwhile, a measurement equipment end only needs to carry out interference operation, absolute safety can be ensured in safety analysis. The scheme satisfies the side-channel-free property of the side channel, has compatibility for imperfect sending end equipment, does not need to monitor the transmission channel, and also has the property irrelevant to measurement equipment. On the basis, according to the scheme. The transmission noise immunity. The key code rate and the transmission distance of the key are improved.

Description

technical field [0001] The invention relates to the technical field of quantum key distribution, in particular to a quantum key distribution method and system with free side channels. Background technique [0002] Based on the basic principles of quantum mechanics, quantum key distribution can provide absolutely secure communication between two parties, and solve the security loopholes of classical key distribution that are easily cracked based on computational complexity. Nowadays, quantum key distribution has made extensive research progress both theoretically and experimentally. Some quantum key distribution protocols have entered the practical field. [0003] However, for the quantum key distribution protocol proposed at this stage, it is necessary to strictly control the parameters of the signal state sent by the trusted sender. If the signal state sent by the sender does not perfectly match the theoretically set signal state , will lead to additional unmonitorable in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/0858H04L9/0855
Inventor 尹华磊顾杰陈增兵
Owner NANJING UNIV
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