A Quantum Random Number Generator Based on Laser Phase Noise

A quantum random number and phase noise technology, applied in random number generators, quantum computers, instruments, etc., can solve problems affecting interference stability, increase system cost, and impact, and achieve improved interference stability, improved stability and The effect of practicality

Active Publication Date: 2022-07-19
北京中科国光量子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • A Quantum Random Number Generator Based on Laser Phase Noise
  • A Quantum Random Number Generator Based on Laser Phase Noise
  • A Quantum Random Number Generator Based on Laser Phase Noise

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The structure of the quantum random number generator is as follows: the long and short arm fibers L1 and L2 of the interferometer 3 are both single-mode fibers; the dual-channel phase stabilization reflection module 3-3 includes a fiber phase shifter 3-3-1 , the first polarization beam splitter 3-3-2 and the first Faraday rotator 3-3-3; the phase stabilization module 9 is the first phase stabilization circuit 9-1, which is used to generate a phase modulation voltage to shift the phase of the fiber The first port of the first polarization beam splitter 3-3-2 is connected to a port of the optical fiber phase shifter 3-3-1; the optical fiber phase shifter 3- The other port of 3-1 and the fourth port of the first polarization beam splitter 3-3-2 are used as the first port and the second port of the dual phase stable reflection module 3-3 respectively; the first polarization beam splitter The second port and the third port of the first Faraday rotator 3-3-2 are respectively ...

Embodiment 2

[0043] The structure of the quantum random number generator is as follows: the long and short arm fibers L1 and L2 of the interferometer 3 are both polarization-maintaining fibers; the two-way phase stabilization reflection module 3-3 includes a second polarization beam splitter 3-3 -4 and half-wave plate 3-3-5; the phase stabilization module 9 includes a second phase stabilization circuit 9-2 and a second temperature control module 9-3, which are used for temperature control of the optical fiber delay line 3-2. Phase modulation is performed; the first port and the fourth port of the second polarization beam splitter 3-3-4 are respectively used as the first port and the second port of the dual-channel phase stable reflection module 3-3; the second polarization The second port and the third port of the beam splitter 3-3-4 are respectively connected with the two ports of the half-wave plate 3-3-5 through polarization maintaining fibers to form a second Sagnac ring; the half-wave ...

Embodiment 3

[0053] The structure of the quantum random number generator is as follows: the long and short arm fibers L1 and L2 of the interferometer 3 are both polarization-maintaining fibers; the dual-phase stable reflection module 3-3 includes a third polarization beam splitter 3-3 -6 and the polarization-maintaining fiber ring 3-3-7; the phase stabilization module 9 includes a third phase stabilization circuit 9-4 and a third temperature control module 9-5, which are used for the above-mentioned polarization-maintaining fiber ring 3-3- 7 temperature control for phase modulation; the first port and the fourth port of the third polarization beam splitter 3-3-6 are respectively used as the first port and the second port of the dual-channel phase stabilization reflection module 3-3; The second port and the third port of the third polarization beam splitter 3-3-6 are connected to the polarization maintaining fiber ring 3-3-7 through a polarization maintaining fiber to form a third Sagnac rin...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F7/58G06N10/20G06N10/40
CPCG06F7/588G06N10/00
Inventor 赵义博王东陈东升
Owner 北京中科国光量子科技有限公司
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