High-speed local oscillator continuous variable quantum key distribution system and method

Abstract

The invention relates to the field of quantum secret communication. The invention discloses a high-speed local oscillator continuous variable quantum key distribution system and method. The system comprises an Alice terminal and a Bob terminal, wherein the Alice end is connected with the Bob end through an optical fiber channel, the Alice end comprises a first continuous laser module, an optical beam splitter, a quantum key modulation module, an optical attenuator, an optical frequency shift module and an optical beam combiner; and the Bob end comprises a second continuous laser module, an optical coupler, a balance detection module, an analog-to-digital conversion module, a digital signal processing module and a post-processing module. According to the invention, low-noise coherent detection of quantum signal light and high saturation of classic reference light can be flexibly realized, the system is simple, the cost is low, the repetition frequency and the safety code rate of the CVQKD system are greatly improved, and the practical process of the high-speed CVQKD system is further promoted.

Description

technical field [0001] The invention relates to the technical field of quantum secure communication, in particular to a high-speed local oscillator continuous variable quantum key distribution system and method. Background technique [0002] The emergence of quantum computing poses a threat to the current mainstream public key cryptography technology represented by ECC / RSA, and will cause a devastating blow to the security of information systems. Quantum secure communication (mainly referring to Quantum Key Distribution, QKD) technology based on the basic principles of quantum mechanics fundamentally solves information security issues in the fields of national defense, finance, government affairs, energy, and commerce, and has major strategic needs and The practical application value has become the focus of strategic competition among developed countries. Among them, Continuous Variable Quantum Key Distribution (Continuous Variable QKD, CVQKD) has the advantages of high com...

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Problems solved by technology

[0003] In order to break through the technical bottleneck that the repetition rate of the local oscillator CVQKD system cannot be further improved, solve the problems of co-fiber transmission and flexible coherent detection of quantum signal light and classical reference light in the current local local oscillator CVQKD system, and further simplify and save system costs, The invention provides a high-speed local oscillator continuous variable quantum key distribution system and method. The invention can flexibly realize the coherent detection of quantum signal light with low noise and classical reference light with high saturation, and the system is simple, the cost is small, and it is extremely Greatly improved the repetition frequency and security code rate of the CVQKD system, further promoting the practical progress of the high-speed CVQKD system

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