Continuous variable quantum key distribution method capable of resisting actual attack

Abstract

The invention provides a continuous variable quantum key distribution (CVQKD) method capable of resisting actual attack. The method comprises the following steps: step A, performing continuous variable quantum information transmission; step B, performing a data post-processing step containing a pre-processing operation, namely, the Bob acquires an original key according to the peak-valley value searching and the Gaussian post-selecting, and acquires the accurate parameter evaluation in combination with the local oscillation light intensity evaluation in real time monitoring, and finally acquires the final key after performing the data post-processing; the existing all actual attacks aiming at the Gaussian modulation CVQKD are resisted on the basis of unchanging the traditional Gaussian modulation CVQDK hardware structure, the actual cost of resisting the actual attack is greatly simplified, and the system complexity is lowered. The attenuation on a signal path by the traditional resisting method is avoided, thereby guaranteeing that the Gaussian-modulation CVQKD system has higher key output rate; furthermore, the potential security flaws of the system are eliminated, and the robustness of the system is improved.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a continuous variable quantum key distribution method capable of resisting actual attacks. Background technique [0002] As information security is getting more and more attention, quantum secure communication with unique security is gradually becoming familiar to everyone. At present, there are two implementation methods of quantum secure communication, namely quantum secure communication based on discrete variable technology and continuous variable technology, among which quantum key distribution (quantum key distribution, QKD) technology is the research focus. Discrete-variable quantum key distribution (DVQKD) has developed relatively maturely, while continuous-variable quantum key distribution (CVQKD) appeared relatively late, but developed rapidly, and is currently Conduct applied research. Like discrete variable techniques, continuous variable QKD is also unc...

AI Technical Summary

Problems solved by technology

However, this scheme needs to insert an intensity modulator in the signal path. On the one hand, it changes the optical path structure of the original Gaussian modulation CVQKD scheme, which increases the complexity of the system implementation. On the other hand, the introduction of the intensity modulator reduces the intensity of the signal path, etc. effectively reduces the system detector efficiency, thereby reducing the final key rate of the system

Images