Quantum random number generator based on laser phase noise

Abstract

A quantum random number generator based on laser phase noise belongs to the technical field of quantum security communication and comprises a laser, a path selection module, an interferometer, a first photoelectric detector, a second photoelectric detector, a data acquisition and processing module, an analog-to-digital converter, a first temperature control module and a phase stabilization module. The interferometer comprises a first beam splitter, an optical fiber delay line and a double-path stable phase reflection module. Compared with the prior art, two paths of optical signals propagating along the long and short arms of the interferometer pass through the same reflecting device by adopting the two paths of stable phase reflection modules, so that the polarization of the two paths of optical signals is kept completely consistent, and the interference stability of the interferometer is further improved; the difference between the electric signals of the two photoelectric detectors is used as a feedback signal for phase compensation of the interferometer, and the sum of the electric signals of the two photoelectric detectors is used as a feedback signal for stable power control of the laser, so that overall stable control is performed on the optical system, and the stability and practicability of the system are further improved.

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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