Polarization encoding device and quantum key distribution system for quantum key distribution

A quantum key distribution and encoding device technology, which is applied in the field of polarization encoding devices and quantum key distribution systems, can solve the problems of inconsistent wavelengths of multiple lasers and high requirements for the drive circuit of the phase modulator, and achieve the resolution of inconsistent wavelengths, reduce complexity, The effect of reducing requirements

Active Publication Date: 2022-01-28
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 encoding device and quantum key distribution system for quantum key distribution
  • Polarization encoding device and quantum key distribution system for quantum key distribution
  • Polarization encoding device and quantum key distribution system for quantum key distribution

Examples

Experimental program
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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 encoding device for quantum key distribution, including a laser LD, an optical path selector, a 2X2 polarization encoding device and a beam combiner BC, wherein the 2X2 polarization encoding device has 2 input ports and 2 output ports , the present invention also provides a quantum key distribution system. Compared with the prior art, a polarization encoding device of the present invention adopts a 2X2 polarization encoding module, only needs one phase modulator, and modulates the phase 0 or π to prepare 4 kinds of BB84 polarization states. It can not only solve the problem of inconsistent wavelengths of multiple lasers, but also reduce the requirements on the driving circuit of the phase modulator. It not only ensures the safety of quantum state preparation, but also reduces the complexity of the encoding device.

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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Patent Type & Authority Patents(China)
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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