A Quantum Random Number Generator Based on Laser Phase Noise

Abstract

A quantum random number generator based on laser phase noise, belonging to the technical field of quantum security communication, comprising a laser, a path selection module, an interferometer, a first photodetector, a second photodetector, a data acquisition and processing module, a modulus A converter, a first temperature control module and a phase stabilization module, the interferometer includes a first beam splitter, an optical fiber delay line and a dual-channel phase stabilization reflection module. Compared with the prior art, the present invention adopts the dual-channel phase-stabilized reflection module, so that the two-channel optical signals propagating along the long and short arms of the interferometer pass through the same reflection device, so that the polarizations of the two are completely consistent, and the interferometer is improved. The interferometric stability; using the difference between the electrical signals of the two photodetectors as the feedback signal for the phase compensation of the interferometer, and using the sum of the electrical signals of the two photodetectors as the feedback signal for the stable control of the laser power to control the optical system Carry out overall stability control to further improve the stability and practicability of the system.

Description

technical field [0001] The invention relates to the technical field of quantum security communication, in particular to a quantum random number generator based on laser phase noise. Background technique [0002] In modern society, random numbers are widely used in simulation, cryptography and many other fields. According to different generation principles, random numbers can be divided into two categories: pseudo-random numbers and true random numbers. Since pseudo-random numbers are generally generated by algorithms, as the threat of quantum computing becomes more and more pressing, pseudo-random numbers will become predictable, so their security cannot be guaranteed. Quantum random number generator (QRNG) is a new technology that uses the intrinsic properties of quantum physics to generate true random numbers. The random number generated by it is completely unpredictable, so it has true randomness, and it is also the most researched and mature quantum random number gener...

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Problems solved by technology

Patent CN106843804A uses Mach-Zehnder interferometer (MZI), the former requires the entire optical system to use full polarization maintaining fiber to ensure the polarization consistency of the two interference signals, which increases the cost of the system; patent CN105022606A uses Faraday-Michelson interferometer (FMI ), by using the Faraday reflector, the polarization change of the long and short arms can be automatically compensated to ensure the polarization consistency of the two interference signals. However, since the polarization rotation angle errors of the two Faraday reflectors cannot be completely the same, the polarization consistency will be reduced, thus affecting the stability of the interference

In addition, this scheme uses an interference signal as the feedback signal for phase compensation, and the fluctuation of the light intensity of the laser will affect the phase compensation process, thereby affecting the generation of random numbers.

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