Continuous variable quantum key distribution method based on super-Nyquist technology

Abstract

The invention discloses a continuous variable quantum key distribution method based on a super-Nyquist technology. The method comprises the steps that a sender performs Gaussian modulation on signal light through a coherent state; the sender carries out up-sampling on the signal light of the sender, converts the signal light into a super-Nyquist signal and transmits the super-Nyquist signal; and the receiving end processes the received signal so as to obtain data sent by the sender. According to the continuous variable quantum key distribution method based on a super-Nyquist technology, a super-Nyquist transmission technology is introduced, the traditional Nyquist rate limit is broken through, and for the problem of intersymbol interference artificially introduced by Nyquist transmission,data post-processing technologies such as cyclic prefix addition, equalization technology and iterative detection are adopted, so that the influence of the intersymbol interference on the system security is effectively eliminated, and the frequency band utilization rate and the channel capacity of the system are improved; and the method is high in reliability and good in safety.

Description

technical field [0001] The invention specifically relates to a continuous variable quantum key distribution method based on the super-Nyquist technique. Background technique [0002] Quantum key distribution enables two distant users, Alice and Bob, to share a common security key in a quantum channel. Quantum communication and its secrecy have attracted widespread attention from all walks of life. The key to quantum communication is quantum key distribution (QKD), which includes two aspects: continuously variable quantum key distribution (CVQKD) and discrete variable quantum key distribution (DVQKD). Although the quantum key distribution of continuous variables appeared late, important achievements have been made in recent years in the distribution of quantum keys of continuous variables. Compared with DVQKD, the source preparation of CVQKD is simple. DVQKD systems need to prepare strictly single-photon quantum states, while CVQKD can use a small number of photon coherent...

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Problems solved by technology

[0004] However, there is no research on the application of super-Nyquist technology in the field of continuously variable quantum key distribution (CVQKD), which affects the frequency band utilization and channel capacity in the process of continuously variable quantum key distribution (CVQKD), At the same time, it also restricts the technical application and development of Continuously Variable Quantum Key Distribution (CVQKD)

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