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Time phase decoding device and quantum key distribution system including same

A decoding device and time-phase technology, which is applied to key distribution, can solve problems such as instability of phase decoding interference, and achieve the effects of easy implementation and application, reduction of system complexity, and reduction of security problems.

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

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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

[0029] 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 principle 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.

[0030] The time phase decoding device of a preferred embodiment of the present invention is as figure 1 As shown, it includes the following components: a beam splitter 102 , a phase modulator 103 , quarter wave plate mirrors 104 and 105 , and a single photon detector 106 .

[0031] The quarter-wave plate reflector includes a quarter-wave plate and a mirror, and the mirror is integrally formed with the quarter-wave plate at a rear end of the quarter...

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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 reflection devices optically coupled with the beam splitter through two arms, a phase modulator arranged at the front end of the beam splitter or on at least one of the two arms, and a single single-photon detector. Each reflecting device is a polarization orthogonal rotation reflecting device, each reflecting device is a quarter-wave plate reflecting mirror, and the quarter-wave plate reflecting mirror is integrally formedby a quarter-wave plate and a reflecting mirror. 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 a first time slot, a second time slot and a third time slot that are consecutive within a pulse period. The time phase coding quantum key distribution decoding scheme can resist polarization-induced fading, and is beneficial to eliminating or reducing the safety problem generated by multiple detectors.

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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Patent Type & Authority Applications(China)
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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