Time phase decoding device and quantum key distribution system including same

A decoding device and time phase technology, applied in key distribution, can solve problems such as phase decoding interference instability, etc., and achieve the effects of easy implementation and application, reduced security issues, and reduced manufacturing costs

Pending Publication Date: 2019-11-15
CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to propose a time phase decoding device and a quantum key distribution system based on the decoding device to solve the problem of unstable phase decoding interference caused by polarization-induced fading in the application of time phase encoding quantum key distribution

Method used

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  • Time phase decoding device and quantum key distribution system including same
  • Time phase decoding device and quantum key distribution system including same
  • Time phase decoding device and quantum key distribution system including same

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Embodiment Construction

[0036] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention. For the sake of clarity and simplicity, detailed descriptions of known functions and structures of the devices described herein will be omitted when it may obscure the subject matter of the present invention.

[0037] The time phase decoding device of a preferred embodiment of the present invention is as figure 1As shown, it includes the following components: a beam splitter 101 , two reflection devices 102 and 103 , and a single photon detector 104 .

[0038] The two reflectors 102 and 103 pass through the two arms ( figure 1 The upper arm and the lower arm) are optically coupled with the beam splitter 101.

[0039] According to the invention, both re...

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Abstract

The invention provides a time phase decoding device and a quantum key distribution system comprising the same. The time phase decoding device comprises a beam splitter, two polarization orthogonal rotation reflection devices which are optically coupled with the beam splitter through two arms respectively, and a single single-photon detector. Each reflective device includes a polarization beam splitter having first, second, third and fourth ports and is coupled to a respective arm via the first port. The second port and the fourth port of the polarization beam splitter are optically coupled through a first transmission light path, and a phase modulator is arranged on the first transmission light path. And a third port of the polarization beam splitter is coupled to the quarter-wave plate reflector through a second transmission light path. The single photon detector is coupled to one of the ports of the beam splitter that are not coupled to the two arms for detecting signals of three consecutive time slots within one pulse period. According to the scheme, polarization-induced fading can be resisted, and the safety problem generated by multiple detectors can be eliminated or reduced.

Description

technical field [0001] The invention relates to the technical field of optical transmission secure communication, in particular to a time phase decoding device and a quantum key distribution system. Background technique [0002] Quantum secure communication technology is a frontier hot field combining quantum physics and information science. Based on the quantum key distribution technology and the principle of one-time pad cryptography, quantum secure communication can realize the secure transmission of information in open channels. Quantum key distribution is based on physical principles such as the Heisenberg uncertainty relation in quantum mechanics and the quantum non-cloning theorem. It can safely share keys among users and detect potential eavesdropping behaviors. It can be applied to national defense, government affairs, Fields with high security information transmission requirements such as finance and electric power. [0003] The terrestrial quantum key distributi...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/85H04B10/70H04B10/67
CPCH04L9/0858H04L9/0819H04B10/85H04B10/70H04B10/67H04B10/671
Inventor 许华醒
Owner CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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