A 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 measuring end, and the quantum state preparation includes: a light source , an intensity modulator, a phase encoder and an adjustable attenuator; the phase encoder is used to modulate each optical pulse according to the target phase encoding mode, so that each optical pulse is divided into two pulses with a target delay, and modulated The phase difference of the two pulses; the phase decoder in the measurement end is used to modulate the phase difference of the two pulses; the polarization controller modulates the polarization state of the light quantum input by the first fiber channel when executing the first target protocol mode. The phase difference between the two pulses is modulated by the phase decoder, which eliminates the difference between the MDI protocol and the BB84 protocol in encoding and detection, realizes the compatibility of the MDI protocol and the BB84 protocol in the same system, and improves the quantum key distribution. usability of the network.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a quantum key distribution networking system and a quantum key distribution method. Background technique [0002] Quantum Key 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, the single-photon detector has the most loopholes and is the most vulnerable to attack, which is the main factor affecting the real security of quantum key distribution. factor. [0003] In response to this situation, there are currently two main solutions. For the trusted protocol of measurement equipment, such as BB84 protocol, defensive mea...

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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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