Continuous variable quantum key distribution system based on independent clock sources and implementation method

Abstract

The invention discloses a continuous variable quantum key distribution system based on independent clock sources and an implementation method. A first clock source provides a reference clock signal to a quantum key sending end, and a second clock source provides a reference clock signal to a quantum key receiving end; before the sending end and the receiving end begin to establish a key, the first clock source and the second clock source perform clock synchronization through a classical channel, and after synchronization, two clocks run independently and do not influence each other. The continuous variable quantum key distribution system based on independent clock sources solves the security vulnerabilities that a synchronous cock signal is easy to steal during transmission in a communication process, and further improves actual security of the continuous variable quantum key distribution system.

Description

technical field [0001] The invention belongs to the technical field of optical fiber quantum communication, and relates to a continuous variable quantum key distribution system and an implementation method based on an independent clock source. Background technique [0002] Quantum key distribution enables legitimate communication parties to safely share keys in an untrusted quantum channel, and its security features are based on the uncertainty principle of quantum mechanics and the quantum non-cloning theorem. At present, quantum key distribution is divided into two directions: discrete variable and continuous variable according to the difference of information carrier. Compared with the discrete variable quantum key distribution protocol, the quantum state of the continuous variable quantum key distribution is easier to prepare, can be integrated into the existing optical fiber system, and can use high-efficiency and low-cost homodyne detection or heterodyne detection tech...

AI Technical Summary

Problems solved by technology

[0003] At present, the research on the continuous variable quantum key distribution system has not entered into full commercialization, the main reason is that there is still a big gap between its actual security and theoretical security.

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