Wavelength attack method, active defense method and continuous variable quantum communication system using wavelength attack method and active defense method

Abstract

The invention discloses a wavelength attack method, an active defense method and a continuous variable quantum communication system using the same, the wavelength attack method can cause two communication parties to overestimate additional noise of the communication system, so that the additional noise generated by an eavesdropping end can be hidden in the method, and the probability that the eavesdropping end is found is reduced; when the defense method is used for attack defense, possible false data can be comprehensively removed, and the security of quantum communication is ensured.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, in particular to a wavelength attack method, an active defense method and a continuous variable quantum communication system using the method. Background technique [0002] Continuous-Variable Quantum Key Distribution (CV-QKD) uses I\Q modulation to encode the key information on the quadrature amplitude and quadrature phase of the light field, and uses a balanced detector for measurement, so It has the advantage of being compatible with coherent optical systems, and has been widely studied and concerned by scholars at home and abroad; in particular, the use of Gaussian modulation coherent state can make the information rate reach the channel capacity of additive Gaussian white noise, and can resist single attack and collective attack And coherent attacks, although the theoretical security of Gaussian modulation coherent state CVQKD has been strictly proved, in actual distribution, t...

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Problems solved by technology

[0002] Continuous-Variable Quantum Key Distribution (CV-QKD) uses I\Q modulation to encode the key information on the quadrature amplitude and quadrature phase of the light field, and uses a balanced detector for measurement, so It has the advantage of being compatible with coherent optical systems, and has been widely studied and concerned by scholars at home and abroad; in particular, the use of Gaussian modulation coherent state can make the information rate reach the channel capacity of additive Gaussian white noise, and can resist single attack and collective attack And coherent attacks, although the theoretical security of Gaussian modulation coherent state CVQKD has been strictly proved, in actual distribution, the defects of real devices will still bring some serious security loopholes, using these security loopholes, the eavesdropping end can Steal part of the key in case of discovery, making CVQKD no longer absolutely safe

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