A device-independent quantum key distribution system and method based on continuous variable measurement

Abstract

The invention provides a quantum key distribution system and method based on continuous variable measurement equipment independence. The quantum key distribution system comprises a sender Alice and a receiver Bob, and is characterized in that the receiver Bob is connected with a balance homodyne detector BHD through a wavelength division multiplexer WDM; the sender Alice is connected with the balance homodyne detector BHD at Alice and Bob ends; after a continuous wave laser device (LD) passes through an intensity modulator (IM), light pulse is formed by attenuation; Gaussian-modulation encoding of a coherent state is finished after the light pulse is processed by an amplitude modulator (AM) and a phase modulator (PM) under the control of a random number generated by a PC (Personal Computer) machine; then a result is sent to a third party Charlie; generated noises have relatively small influences on the system; influences on a safety key generation speed of the system, caused by forward transmission and backward transmission of a channel can be ignored; and advantages of a metropolitan area network based on a CV-MDIQKD quantum cryptography communication system are very obvious, and a foundation can be laid for commercialized and networked application in the future.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, and in particular relates to a device-independent quantum key distribution system based on continuous variable measurement and a method thereof. Background technique [0002] In the quantum key distribution based on continuous variables, conventional detectors are used to detect with methods such as balanced zero-beat detection or heterodyne detection. Therefore, there are many attacks on the detection end, such as: standard attack, local oscillation light intensity attack , wavelength attack, saturation attack, etc., which bring some security holes to the system. Therefore, the concept of Measurement Device Independent Quantum Key Distribution (MDIQKD) is introduced into the continuous variable quantum key distribution to solve the problem of In order to solve the security holes caused by the flaws of detectors, the idea of ​​Continuous Variable Measurement Device Independent Quant...

AI Technical Summary

Problems solved by technology

[0006] Since CV-MDIQKD was proposed, it has made some progress in theoretical research, but no more optimized protocol has been proposed. In terms of experimentation, except for the above-mentioned demonstration experiments based on free space channels, there is no newer experiment report, and due to the demonstration The distance between the experiment and the real experimental implementation is very different in terms of channel and light source wavelength, etc., which does not represent the experimental implementation of CV-MQIQKD

Images