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Quantum key distribution system based on phase and polarization composite coding

A technology of quantum key distribution and composite encoding, which is applied in the field of quantum key distribution system, can solve the problems of unable to meet the encryption requirements of optical fiber communication and low key generation rate, and achieve the effect of simple structure, reduced complexity and stable performance

Pending Publication Date: 2019-12-27
赵义博 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the key generation rate of the current QKD system is low, which cannot meet the encryption requirements of the existing traditional optical fiber communication.

Method used

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  • Quantum key distribution system based on phase and polarization composite coding
  • Quantum key distribution system based on phase and polarization composite coding
  • Quantum key distribution system based on phase and polarization composite coding

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Experimental program
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Embodiment 1

[0019] Embodiment one, such as figure 2 As shown, the phase encoding module 130 is a unequal arm MZ interferometer, and the polarization encoding module 140 includes an encoding circulator 141, an encoding phase modulator 142 and an encoding Faraday rotating mirror 143 connected in sequence, and the unequal arm MZ The optical outlet of the interferometer is connected to one port of the encoding circulator 141, the two ports of the encoding circulator 141 are connected to the encoding phase modulator 142, and the three ports of the encoding circulator 141 are connected to the attenuator 150; the polarization decoding module 220 includes a decoding circulator 221 , a decoding phase modulator 222 and a decoding Faraday rotating mirror 223, one port of the decoding circulator 221 is connected to the deviation correction module 210, and two ports are sequentially connected to the decoding phase modulator 222 and the decoding Faraday rotating mirror 223, and the phase decoding modul...

Embodiment 2

[0020] Embodiment two, such as image 3 As shown, the phase encoding module 130 is a unequal arm MZ interferometer, and the polarization encoding module 140 includes an encoding circulator 141, an encoding phase modulator 142 and an encoding Faraday rotating mirror 143 connected in sequence, and the unequal arm MZ The optical outlet of the interferometer is connected to one port of the encoding circulator 141, the two ports of the encoding circulator 141 are connected to the encoding phase modulator 142, and the three ports of the encoding circulator 141 are connected to the attenuator 150; the polarization decoding module 220 includes a decoding circulator 221 , a decoding phase modulator 222 and a decoding Faraday rotating mirror 223, one port of the decoding circulator 221 is connected to the deviation correction module 210, and two ports are sequentially connected to the decoding phase modulator 222 and the decoding Faraday rotating mirror 223, and the phase decoding module...

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Abstract

The invention discloses a quantum key distribution system based on phase and polarization composite coding. The system comprises a sending end and a receiving end, wherein the sending end comprises alaser, an intensity modulator, a phase encoding module, a polarization encoding module and an attenuator which are connected in sequence, the receiving end comprises a deviation rectifying module, a polarization decoding module, a phase decoding module and a single-photon detector which are connected in sequence, and the sending end and the receiving end are connected through the attenuator and the deviation rectifying module. Compared with the prior art, the method has the advantages that the efficiency of the protocol can be improved by performing phase and polarization composite encoding onthe single photon bits, and the efficiency can be improved to four times of that of the original protocol by adopting a partial basis selection mode; the polarization encoding and decoding structureis simple, the performance is stable, the complexity of the system is reduced, and the safety of the system is improved; a phase and polarization composite coding mode is adopted, and the system can work in another mode under the condition that one mode is down, so that the working stability of the system is improved to a certain extent.

Description

technical field [0001] The invention relates to the technical field of quantum polarization encoding, in particular to a quantum key distribution system for composite encoding of phase and polarization. Background technique [0002] Quantum key distribution (Quantum key distribution, QKD) can ensure unconditional and safe key distribution between two parties in long-distance communication, and the basic principle of quantum mechanics guarantees its information theory security. After more than 30 years of research and development, quantum key distribution has gradually become practical. Among them, the BB84 QKD protocol is the most mature technology at present and the most widely used. The typical BB84 protocol only encodes bit information in one dimension of a single photon, such as phase, polarization or frequency. Information is encoded in multiple dimensions of a single photon, so that a single photon carries multi-bit information, and then these dimensions are decoded s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/0858
Inventor 王东宋萧天赵义博曹兆龙
Owner 赵义博