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A phase codec and quantum key distribution system

A quantum key distribution, codec technology, applied in key distribution, can solve the problem that the one-way phase encoding quantum key distribution system cannot meet the high-speed working speed and stability

Active Publication Date: 2020-06-26
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0005] In view of this, the present invention provides a phase codec and a quantum key distribution system to solve the problem that the unidirectional phase coding quantum key distribution system based on the unequal arm Faraday-Michelson interferometer in the prior art cannot meet the high-speed working rate and the problem of stabilizing dual needs

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  • A phase codec and quantum key distribution system
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  • A phase codec and quantum key distribution system

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Embodiment Construction

[0046] As mentioned in the background technology section, there is already a phase-encoded quantum key distribution system that is immune to channel interference and has high stability in the prior art, but this system is still limited by the working rate and cannot work at a high working rate .

[0047] The inventors found that the reason for the above phenomenon is that in the prior art, the unequal-arm Faraday-Michelson interferometer of the phase-encoded quantum key distribution system that is immune to channel interference and has relatively high stability, however, in this system , since the optical signal passes through the phase modulator once each round trip, based on the requirement of phase modulation accuracy, the electrical signal loaded on the phase modulator generally remains unchanged, so that the original phase-encoded quantum cryptography based on the unequal arm Faraday-Michelson interferometer Key distribution systems are limited by high rates.

[0048] Ba...

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Abstract

The invention provides a phase encoder / decoder and a quantum key distribution system. The phase encoder / decoder comprises a Sagnac ring structure, that is, the Sagnac ring structure is adopted to replace a back and forth structure for high-speed phase loading, fractions perpendicular to two polarizations of a same pulse pass through a phase modulator for a single time simultaneously, and not onlyis a characteristic of polarization stabilization achieved, but also advantages of high speeds and high efficiency are achieved. According to the phase encoder / decoder, a Faraday-Sagnac-Michelson encoder is adopted as a core phase encoding quantum key distribution system, one-way high-speed safety key distribution can be achieved, and the phase encoder / decoder has the advantages of channel deviation disturbance resistance and high encoding rates are achieved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a phase codec and a quantum key distribution system. Background technique [0002] Due to the influence of channel birefringence, the optical fiber quantum key distribution system mostly adopts the phase encoding scheme, and the early phase encoding scheme mostly adopts the double unequal arm Mach-Zehnder (Mach-Zehnder) In the sending and receiving devices of the system, the light pulses experience different interference arms of the double unequal arm Mach-Zehnder interferometer, resulting in different interferences, resulting in poor stability of the phase-encoded quantum key distribution system and being easily affected by environmental disturbances. . [0003] In order to obtain a highly stable quantum key distribution system, there are currently two main solutions, one is the Plug-and-Play (plug and play) round-trip (two-way) phase-encoded quantum key distribution syst...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08
CPCH04L9/0858
Inventor 王双陈巍银振强何德勇周政郭光灿韩正甫
Owner UNIV OF SCI & TECH OF CHINA
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