Quantum key distribution networking system and quantum key distribution method

Abstract

The invention discloses a quantum key distribution networking system and a quantum key distribution method. The system comprises a first quantum state preparation sending end, a second quantum state preparation sending end and a measurement end. The quantum state preparation comprises a light source, an intensity modulator, a phase encoder and an adjustable attenuator; the phase encoder is used for modulating each light pulse according to a target phase encoding mode, so that each light pulse is divided into two pulses with target delay, and the phase difference of the two pulses is modulated; a phase decoder in the measuring end is used for modulating the phase difference of the two pulses; and the polarization controller modulates the polarization state of the light quantum input by the first optical fiber channel when the first target protocol mode is executed. The phase difference between the two pulses is modulated through the phase decoder, so that the difference between the MDI protocol and the BB84 protocol in coding and detection is eliminated. The compatibility of the MDI protocol and the BB84 protocol in the same system is realized, and the practicability of the quantum key distribution network is improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a quantum key distribution networking system and a quantum key distribution method. Background technique [0002] The quantum key distribution (QuankumKey Distribution, QKD) technology is based on the principle of quantum physics, which can realize unconditionally secure key sharing in the sense of information theory, and is a secure communication method based on quantum physics. However, affected by the non-ideal characteristics of actual devices and equipment, the quantum key distribution system will face the risk of side-channel attacks. Among them, single-photon detectors have the most loopholes and are most vulnerable to attacks, which is the main factor affecting the actual security of quantum key distribution. factor. [0003] In view of this situation, there are mainly two solutions at present. For trusted protocols for measuring equipment, such as the BB84 proto...

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Problems solved by technology

[0004] In the actual use of the QKD network, different application scenarios have different requirements for key rate and security. If the same set of quantum key distribution network system can be compatible with the BB84 protocol and the MDI protocol, the high key rate of the two The combination of high efficiency and high security features is the key to improving the practical ability of the quantum key distribution network. However, the existing key distribution network system is not effectively compatible with the BB84 protocol and the MDI protocol.

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