Continuous variable measurement equipment independent quantum key distribution system and phase compensation method

Abstract

The invention belongs to the technical field of quantum communication, and particularly relates to a continuous variable measurement equipment independent quantum key distribution system and a phase compensation method. In order to eliminate all side channel attacks on a measurement end in an actual continuous variable quantum key distribution system, the system comprises two sending ends Alice and Bob and a receiving end Charlie. The transmitting end mainly comprises a laser module, an optical phase locking module, a chopped pulse module, a signal light modulation module and a time division multiplexing and polarization multiplexing module. And the receiving end mainly comprises a polarization demultiplexing module, a clock recovery module, an optical delay module, a 90-degree optical mixer module and a continuous variable Bell state measurement module. The phase compensation method comprises four parts of optical phase locking, slow drift phase estimation, real-time phase feedback and orthogonal component remapping, and continuous variable Bell state measurement of a long-distance independent quantum state can be realized.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, and in particular relates to a continuous variable measurement device-independent quantum key distribution system and a phase compensation method. Background technique [0002] Information security is the cornerstone of the healthy development of modern society. With the development of economy and technology, people have higher and higher requirements for communication security. Quantum key distribution can realize the sharing of security keys between two parties in long-distance legal communication through insecure quantum channels, and its security is guaranteed by the basic principles of quantum mechanics. Quantum key distribution combined with one-time pad cryptosystem can realize unconditionally secure and confidential communication. [0003] Quantum key distribution mainly includes two technical approaches: discrete variable quantum key distribution and continuous variable qu...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a continuous variable measurement device independent quantum key distribution system to avoid all side channel attacks caused by the defects of the system measurement end in the real environment, and to provide a continuous variable measurement device independent quantum key distribution system phase compensation method to solve the phase drift problem existing in the system and realize reliable continuous variable Bell state measurement

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