Control method and control system for selective device of partial-selective quantum cryptosystem

Abstract

The invention discloses a control method and a control system for a selective device of a partial-selective quantum cryptosystem. The method comprises: dividing a communication time into several timeframes, wherein the times in each time frame are the same; generating a biased random number sequence in durations of several time frames; reversing the generation probabilities of bit 0 and bit 1 inthe biased random number sequence in the interval frame; amplifying the signal of the random number sequence, and transmitting the amplified signal to the selective device of the transmitting end or the receiving end of the partial-selective quantum cryptosystem to realize modulation of the selected device. The invention divides the communication time into short time frames by using a method similar to time division multiplexing, and changes the partial basis mode within the interval frame, so that the balance of the high and low levels is maintained throughout the communication time, therebysolving the problem caused by the presence of the direct current component in the modulated signal in the prior art.

Description

technical field [0001] The invention belongs to the technical field of quantum cryptography communication, and in particular relates to a control method and a control system of a base selection device of a partial base quantum cryptography system. Background technique [0002] Quantum cryptography communication combines the principles of quantum physics and modern communication technology. Quantum cryptography communication uses physical principles to ensure the security of the remote key negotiation process and results. Combined with the "one-time pad" encryption technology, it can realize secure communication that does not depend on the complexity of the algorithm. [0003] At present, quantum cryptography technology mainly uses photons as the realization carrier, which is distributed through free space or fiber optic channel. According to the requirements of different quantum key distribution protocols, quantum key distribution equipment uses various optical modulation d...

AI Technical Summary

Problems solved by technology

As far as we know, most of the high-speed gain amplifiers used for amplification are based on AC coupling, and they cannot amplify the DC part of the random number signal, which requires that the electrical signal connected to the gain amplifier must be at a high or low level. In the state where the levels are balanced with each other, this leads to the distortion of the base selection signal after amplification in the case of biased base selection, which eventually leads to errors in state preparation and state measurement, resulting in increased system errors and reduced efficiency. can't even work

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