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Independent quantum key distribution system and method for multi-user measurement equipment

A technology for quantum key distribution and measurement equipment, applied in the field of multi-user measurement equipment-independent quantum key distribution systems, can solve the problems of complex structure of irrelevant quantum key distribution, low stability and reliability, and low coding rate, etc. Achieve the effect of easy expansion, high key generation rate, and few optical components

Active Publication Date: 2018-06-19
NAT QUANTUM COMM GUANGDONG CO LTD
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Problems solved by technology

The currently proposed multi-user measurement equipment-independent quantum key distribution has a complex structure, high cost, and relatively low coding rate, low stability and reliability

Method used

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  • Independent quantum key distribution system and method for multi-user measurement equipment
  • Independent quantum key distribution system and method for multi-user measurement equipment
  • Independent quantum key distribution system and method for multi-user measurement equipment

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Embodiment Construction

[0051] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0052] Refer to attached Figure 1-Figure 6 As shown, a multi-user measurement device-independent quantum key distribution system includes User-1 terminal-1', User-2 terminal-2', User-3 terminal-3'...User-n and intermediate measurement unit- 4'; where:

[0053] Among them, User-1, User-2, User-3...User-n have the same structure, they are all user terminals, that is, user terminals, which are used to generate pulse lasers to form keys.

[0054] In this embodiment, the User-1 terminal-1' includes a first pulse laser-101, a first polarization modulator-102, a first intensity modulator-103 and a first adjustable attenuator-104;

[0055] The User-2 terminal-2' includes a second pulse laser-201, a second polarization modulator-202, a second intensity modulator-203 and a second adjustable attenuator-204;

[0056] The User-3 terminal-3' includes ...

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Abstract

The invention discloses an independent quantum key distribution system and method for multi-user measurement equipment. The system comprises a plurality of clients and an intermediate measuring unit;lasers of the plurality of clients emit pulse laser and a polarization modulator randomly loads the pulse laser into horizontal, vertical, +45 degrees and -45 degrees polarized light pulse; after thepulse laser is subjected to an intensity modulator, a decoy state component is added, and then an adjustable attenuator accurately attenuates the pulse laser into a weak coherent laser pulse with an average photon number of less than 1. The intermediate measuring unit measures signals transmitted by the plurality of clients via a quantum channel; different results are output according to the jointpolarized quantum state of all users, the intermediate measuring unit announces a measurement result, and the plurality of clients generate a key locally based on the measurement result. According tothe independent quantum key distribution system for the multi-user measurement equipment provided by the invention, multiple parties can generate the same key at the same time, and the expansion is easy; and the adopted structure is simple, the used components are mature, the operation is simple, and the transmission is stable.

Description

technical field [0001] The invention relates to the technical field of quantum information and optical communication, in particular to a multi-user measurement equipment independent quantum key distribution system and method. Background technique [0002] Quantum Key Distribution (Quantum Key Distribution, QKD) is an emerging cryptographic method developed in the 1980s based on quantum mechanics and information theory, which can allow legitimate participants in different positions to share keys in an absolutely secure manner. At present, point-to-point quantum key distribution has become increasingly mature. Commonly used protocols include BB84 protocol, B92 protocol, EPR protocol, etc. The BB84 protocol proposed by Bennett in 1984 uses two identical non-equal arm M-Z interferometers as encoders. And the decoder, this encoding method is not stable enough due to the change of the photon polarization state due to the stretching and bending of the optical fiber, and its operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70H04B10/524H04B10/532H04B10/54H04B10/564
CPCH04B10/70H04L9/0855H04L9/0858H04B10/564H04B10/541H04B10/532H04B10/524Y02D30/70
Inventor 郭邦红张立涛胡敏冉攀曾涵宇曾炎颖何翼龙
Owner NAT QUANTUM COMM GUANGDONG CO LTD
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