Short noise continuous variable quantum key distribution monitoring method with safety

Abstract

The invention discloses a short noise continuous variable quantum key distribution monitoring method with safety. The method comprises the following steps of 1, transmitting a Gaussian signal; 2, randomly measuring data or short noise variance; 3, performing real-time evaluation on the short noise variance; 4, evaluating a monitoring error; and 5, calculating a safe secret key rate. The short noise continuous variable quantum key distribution monitoring method has untrahigh safety; and through real-time monitoring to the short noise variance, all existing attacks to local oscillating light are resisted. Besides, because of limited length of monitoring data and limited extinction ratio of a strength modulator in a real condition, a safety monitoring system has a monitoring error. The monitoring error is calculated and is furthermore used as a system over-noise, and furthermore the safe secret key rate with safety is calculated. Furthermore the short noise continuous variable quantum key distribution monitoring method realizes easy realization. Through adding a strength modulator in a receiving-end signal path, safety monitoring is realized and realization cost is saved.

Description

technical field [0001] The invention relates to a monitoring method, in particular to a safe shot noise continuous variable quantum key distribution monitoring method. Background technique [0002] In the context of the rapid development of computer information technology, information technology has increasing requirements for information security. In recent years, quantum key distribution technology has attracted widespread attention because it can physically guarantee the unconditional security of communication. [0003] Quantum key distribution technology is generally divided into two categories: discrete variable quantum key distribution and continuous variable quantum key distribution. Compared with discrete variable quantum key distribution technology, continuous variable quantum key distribution technology has higher communication Speed ​​and efficiency, therefore, have attracted many research institutions in the world to conduct in-depth research on its theory and ap...

AI Technical Summary

Problems solved by technology

However, since the local oscillator light needs to be transmitted in the actual system, once the eavesdropper modifies the local oscillator light in the transmission process, it will cause a series of security problems, so we need to monitor the system in real time to ensure system security

[0004] The traditional solution is to separate a part of the local oscillator light at the receiving end, and use an optical power meter to monitor its intensity. However, when the pulse shape is modified, the correspondence between the variance of its shot noise and the intensity of the local oscillator light will be changed. Changes, resulting in security vulnerabilities, the corresponding alternative is to directly monitor the variance of shot noise, however, direct monitoring of the variance of shot noise will introduce monitoring errors due to the fluctuation of Gaussian data

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