Gaussian modulation data generation method for continuous variable quantum key distribution system based on heterodyne detection

Abstract

The invention provides a Gaussian modulation data generation method for a continuous variable quantum key distribution system based on heterodyne detection. The main purpose is to realize efficient Gaussian modulation data generation. The method comprises the following steps: 1. detecting vacuum state noise through a heterodyne detection system to obtain two groups of original Gaussian random numbers; 2. evaluating the number of true random numbers contained in the directly obtained two groups of original Gaussian random numbers, calculating and determining the number of bits of a Gaussian original random number to be extracted in a random extraction operation, and obtaining two groups of safe equal-length Gaussian random numbers; and 3. evaluating the data accuracy of the required Gaussian random numbers, and synthesizing a required precise Gaussian random number by using multiple Gaussian random numbers. According to the Gaussian modulation data generation method provided by the invention, the two groups of original Gaussian random numbers can be directly obtained through heterodyne detection to generate safe Gaussian random numbers, thereby achieving efficient Gaussian modulation.

Description

technical field [0001] The invention relates to a continuous variable quantum key distribution system, especially the preparation of a Gaussian state in the system, especially the direct acquisition of a safe Gaussian random number through a heterodyne detection method to realize efficient Gaussian modulation. Background technique [0002] In today's era, information security is becoming more and more important. Quantum key distribution system is currently the most secure information encryption method and has a good development prospect. [0003] In the entire QKD system, the application of random numbers can be seen everywhere, and its status is very important. The entire QKD system has very strict requirements on the randomness of random numbers. For example, the key initially generated by Alice at the sending end is a random sequence, and the quality of the randomness of this random sequence determines the security of the final key. In order to obtain random numbers with...

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Problems solved by technology

[0007] Aiming at the problem that the generation of quantum true random numbers in the continuous variable quantum key distribution system is relatively complicated, the present invention proposes a scheme using heterodyne detectors to realize Gaussian modulation in the continuous variable quantum key distribution system. The difference detection system is used to generate the original Gaussian number, and then a random extraction operation is taken to obtain a safe Gaussian random number, and the obtained Gaussian random number is used to prepare a random number conforming to the Rayleigh distribution and uniform distribution, which are converted into electrical signals and loaded on the Modulation of Gaussian signals on intensity modulator and phase modulator

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