A four-state modulation continuous variable quantum key distribution data coordination method and system

Abstract

The invention relates to a four-state modulation continuous variable quantum key distribution data coordination method and system, and the method comprises the steps: enabling a key to be modulated toa coherent state, and enabling the coherent state to be transmitted to a receiving end through a quantum channel; acquiring a measurement result by utilizing a balance homodyne detector, further acquiring a normalization result of a coherent state, determining a filtering function value, judging whether each bit of key is reserved or not, if so, marking freezing bit information at the position ofthe bit of key, and sending a key information segment in the reserved key to a sending end through a classical channel; Judging whether the quantum channel is safe or not, and sending judgment information to a receiving end; If the judgment information is quantum channel security, freezing bit information of the key information except the key information segment is coded by a system Polar code and then sent to a sending end; And the freezing bit information is decoded by a Polar code of the system, key information corresponding to the freezing bit information is obtained, and a final securitykey is obtained through encryption amplification. According to the method, the data coordination efficiency can be improved, the security key can be effectively extracted, and the equipment complexity can be reduced.

Description

technical field [0001] The invention belongs to the cross technical field of quantum information science, and in particular relates to a four-state modulation continuous variable quantum key distribution data coordination method and system. Background technique [0002] According to the physical characteristics of quantum mechanics, the quantum key distribution (Quantum key distribution, QKD) protocol transmits the quantum state of encoded information between the sender and the receiver through the quantum channel, which can establish a secure communication key between legitimate users, and The physical mechanism guarantees its security and detectability to eavesdroppers. The theoretical scheme of the QKD protocol includes two parts. The first part includes data encoding, transmission, and decoding. The purpose is to establish shared data between two users and obtain a screening key; the second part is to estimate and detect Find out whether the existing transmission proces...

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Problems solved by technology

[0004] In 2009, Leverrier et al proposed the two-state and four-state modulation coherent CVQKD protocol, which is a kind of non-Gaussian modulation protocol, which increases the communication transmission distance, but the linear noise-free amplifier equipment used in this protocol is complex and the actual success rate Well below expectations and therefore unable to meet demand

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