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Polarization coding device used for quantum key distribution and quantum key distribution system

A technology of quantum key distribution and encoding device, applied in the field of polarization encoding device and quantum key distribution system, can solve the problems of high requirement of phase modulator driving circuit, inconsistent wavelength of multiple lasers, etc., to solve the problem of inconsistent wavelength and reduce complexity , the effect of reducing requirements

Active Publication Date: 2021-11-26
ZHEJIANG QUANTUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above defects in the prior art, the present invention proposes a polarization encoding device and a quantum key distribution system for quantum key distribution to solve the inconsistency of wavelengths of multiple lasers used in the quantum key distribution system in the prior art, and Technical defect with high requirements for phase modulator drive circuit

Method used

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  • Polarization coding device used for quantum key distribution and quantum key distribution system
  • Polarization coding device used for quantum key distribution and quantum key distribution system
  • Polarization coding device used for quantum key distribution and quantum key distribution system

Examples

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Effect test

Embodiment 1

[0032]The structure of the polarization encoding device is: the optical path selector is a beam splitter BS, and the 2X2 polarization encoding module includes a first circulator CIR1, a second circulator CIR2, a first polarization beam splitter PBS1, a fiber delay Line DL, phase modulator PM, second polarization beam splitter PBS2, first Faraday rotator FR1, first slave laser SL1, second Faraday rotator FR2, and second slave laser SL2, the first Faraday rotator FR1 , the first slave laser SL1, the second Faraday rotator FR2, and the second slave laser SL2 form a reflection assembly, and the polarization-maintaining fiber between the first circulator CIR1 and the first port of the first polarization beam splitter PBS1 conducts a 45° For fusion splicing, the polarization-maintaining fiber between the second circulator CIR2 and the second port of the 2X2 polarization encoding module is fused at 45°, the fiber delay line DL, the phase modulator PM, the first polarization beam split...

Embodiment 2

[0059] The structure of the polarization encoding device is: the optical path selector is a beam splitter BS, and the 2X2 polarization encoding module includes a first circulator CIR1, a second circulator CIR2, a first polarization beam splitter PBS1, a fiber delay Line DL, phase modulator PM, second polarization beam splitter PBS2, first optical switch OSW1, first Faraday mirror FM1, second optical switch OSW2, second Faraday mirror FM2, the first optical switch OSW1, The first Faraday reflector FM1, the second optical switch OSW2, and the second Faraday reflector FM2 constitute a reflective assembly, and the polarization-maintaining fiber between the first circulator CIR1 and the first port of the first polarization beam splitter PBS1 conducts a 45° For fusion splicing, the polarization-maintaining fiber between the second circulator CIR2 and the second port of the 2X2 polarization encoding module is fused at 45°, the fiber delay line DL, the phase modulator PM, the first pol...

Embodiment 3

[0065] The structure of the polarization encoding device is: the optical path selector is a third optical switch OSW3, and the 2X2 polarization encoding module includes a first circulator CIR1, a second circulator CIR2, a first polarization beam splitter PBS1, an optical fiber extension Time line DL, phase modulator PM, second polarization beam splitter PBS2, third Faraday mirror FM3, fourth Faraday mirror FM4, the third Faraday mirror FM3, fourth Faraday mirror FM4 constitute a reflection assembly, The third optical switch OSW3 is a 1X2 optical switch, the polarization-maintaining optical fiber between the first circulator CIR1 and the first port of the first polarization beam splitter PBS1 is fused at 45°, and the second circulator CIR2 and the 2X2 The polarization-maintaining fiber between the second ports of the polarization encoding module is fused at 45°, and the fiber delay line DL, phase modulator PM, first polarization beam splitter PBS1 and second polarization beam sp...

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Abstract

The invention discloses a polarization coding device used for quantum key distribution, the polarization coding device comprises a laser LD, an optical path selector, a 2X2 polarization coding device and a beam combiner BC, the 2X2 polarization coding device is provided with two input ports and two output ports, and the invention also provides a quantum key distribution system. Compared with the prior art, the polarization encoding device adopts the 2X2 polarization encoding module, only one phase modulator is needed, the modulation phase is 0 or pi, and four BB84 polarization states can be prepared. The problem that the wavelengths of multiple lasers are inconsistent can be solved, and the requirement for a phase modulator driving circuit is lowered. The safety of quantum state preparation is ensured, and the complexity of the coding device is reduced.

Description

technical field [0001] The invention relates to the technical field of quantum polarization encoding, in particular to a polarization encoding device and a quantum key distribution system for quantum key distribution. 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. At present, the quantum key distribution system of the BB84 protocol is becoming more and more mature and has become practical. The four polarization states commonly used in the BB84 protocol for polarization coding are , , , . [0003] Such as figure 1 As shown, a typical polarization-encoded BB84 QKD system is given. Each polarization state at the sending end is generated by a laser, and coupled into the same optical fiber through a polarization beam splitter PBS and a beam spl...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/70H04B10/556H04B10/532H04B10/516
CPCH04L9/0858H04B10/70H04B10/532H04B10/5561H04B10/5161
Inventor 蒋荻董智超严锋
Owner ZHEJIANG QUANTUM TECH CO LTD
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