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A Time-Phase Encoding Measurement Device-Independent Quantum Key Distribution System

A technology of quantum key distribution and phase encoding, which is applied in the field of time-phase encoding measurement equipment-independent quantum key distribution system, can solve the problems of not being able to automatically compensate the polarization change of the fiber channel, increase the fiber channel, increase the cost, etc., and achieve the elimination of frequency Inconsistency, automatic compensation for channel polarization changes, and reduced complexity effects

Active Publication Date: 2021-09-07
ZHEJIANG QUANTUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this solution needs to increase the optical fiber channel between the two quantum state preparation terminals, which increases the cost of practical application
In addition, because the optical signal in this scheme only passes through the fiber channel once, and only the quantum state preparation module is a round-trip optical path, which is different from the conventional "Plug & Play" structure that passes through the fiber channel twice, so it cannot automatically compensate for the fiber channel. The polarization change

Method used

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  • A Time-Phase Encoding Measurement Device-Independent Quantum Key Distribution System
  • A Time-Phase Encoding Measurement Device-Independent Quantum Key Distribution System
  • A Time-Phase Encoding Measurement Device-Independent Quantum Key Distribution System

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The structure of the measuring end Charlie300 is: the first optical path selection device 330 and the second optical path selection device 340 are corresponding first optical fiber circulators and second optical fiber circulators, and the double pulse sequence generation module 320 includes a first A polarization maintaining beam splitter BS1, a third intensity modulator IM3, a fourth intensity modulator IM4, a second polarization beam splitter PBS2 and a third polarization beam splitter PBS3, the first polarization maintaining beam splitter BS1 and the second The polarization beam splitter PBS2 forms an equi-arm interferometer, the second polarization beam splitter PBS2 and the third polarization beam splitter PBS3 form an unequal-arm interferometer, and the third intensity modulator IM3 and the fourth intensity modulator IM4 Located on the two arms of the equi-arm interferometer, and respectively performing 45° fusion splicing with the polarization-maintaining fiber be...

Embodiment 2

[0044] The structure of the measuring end Charlie300 is: the first optical path selection device and the second optical path selection device are corresponding eighth polarization beam splitter PBS8 and ninth polarization beam splitter PBS9, and the double pulse sequence generation module includes the first Four polarization maintaining beam splitters BS4, fifth polarization maintaining beam splitter BS5, fifth intensity modulator IM5, sixth intensity modulator IM6, sixth polarization beam splitter PBS6 and seventh polarization beam splitter PBS7, the first The four polarization-maintaining beam splitters BS4 and the sixth polarization beam splitter PBS6 form an equi-arm interferometer, the sixth polarization beam splitter PBS6 and the fifth polarization-maintaining beam splitter BS5 form an equi-arm interferometer, and the fifth The intensity modulator IM5 and the sixth intensity modulator IM6 are located on the two arms of the equi-arm interferometer, and respectively perform...

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Abstract

A time-phase encoding measurement device-independent quantum key distribution system, including a first quantum state preparation end with an Alice time-phase encoding module, a second quantum state preparation end with a Bob time-phase encoding module, and a measurement end Charlie , wherein the Alice time-phase encoding module and the Bob time-phase encoding module are the same round-trip structure with time-phase encoding function and automatic polarization change compensation function. Compared with the prior art, the present invention only uses a single laser combined with a reciprocating structure, which can eliminate the problem of frequency inconsistency between the two lasers, and can automatically compensate channel polarization changes without using an active deviation correction module. Moreover, the arrival time of the two paths of light can be precisely adjusted by using a light intensity modulator to perform continuous light chopping, without using a high-precision optical fiber delay line. In addition, the system does not need to calibrate the phase reference system, which reduces the complexity of the system.

Description

technical field [0001] The invention relates to the technical field of quantum polarization encoding, in particular to a time-phase encoding measurement device-independent quantum key distribution system. Background technique [0002] Quantum key distribution (quantum key distribution, QKD) can provide unconditionally secure key distribution for long-distance communication parties, and its information theory security is guaranteed by the basic principles of quantum mechanics. However, due to the imperfection of the devices in the actual QKD system, there is a certain gap with the security theoretical model, resulting in a decrease in its actual security. Among them, the measurement end, that is, the single photon detector part, has the most loopholes and is the most vulnerable part. The proposal of the measurement-device-independent quantum key distribution protocol (measurement-device-independent, MDI-QKD) removes the trustworthy requirements for the measurement end, can r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04B10/70H04B10/516
CPCH04B10/5161H04B10/70H04L9/0858
Inventor 陈鹏
Owner ZHEJIANG QUANTUM TECH CO LTD
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