Efficient Continuous Variable Quantum Key Distribution System and Its Implementation Method Based on Artificial Neural Network

Abstract

The invention discloses an efficient continuous variable quantum key distribution system based on an artificial neural network and an implementation method thereof. The system includes a signal sending end, a transmission channel and a signal receiving end; the method is that the signal sending end polarizes light, and the amplitude, Phase modulation makes it loaded with the original key information, and then transmits it to the signal receiving end through the transmission channel, modulates the received optical signal at the signal receiving end, performs homodyne detection, and then selects the initial key information between the signal sending end and the signal receiving end The key is learned by artificial neural network, and then the relationship between the key of the signal sending end and the signal receiving end is obtained, so that the signal receiving end holds all the keys of the signal sending end. On the premise of ensuring the security of the system, the key rate and the safe transmission distance are improved, and the accuracy of parameter estimation and the whole prediction process is guaranteed. The invention does not need to add a lot of hardware devices, does not bring a heavy burden to the system, and is easy to realize in common CV-QKD.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, in particular to an efficient continuous variable quantum key distribution system based on an artificial neural network and an implementation method thereof. Background technique [0002] In secure communication, Quantum Key Distribution (Quantum Key Distribution, QKD) is used to generate and distribute keys. As an implementation of QKD, Continuous-Variable Quantum Key Distribution (CV-QKD) Using orthogonal modulation and coherent detection technology for key distribution has unconditional security, which is simpler to implement, better compatible with classical coherent optical communication systems, higher code rate, lower loss, and stronger security . In recent years, the typical representative of CV-QKD: the Gaussian modulated coherent state (GMCS) scheme has developed rapidly, and it has good security against collective attacks and coherent attacks. In this protocol, the sign...

AI Technical Summary

Problems solved by technology

In order to estimate the upper limit of the amount of information stolen by an eavesdropper, the communication parties must evaluate the transmittance T and the excess noise ξ. Traditional parameter estimation requires the communication parties to disclose a part of the initial key. The more these initial keys are, the more accurate the channel estimation is. It will lead to poor information utilization and a significant reduction in key rate

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