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Single-state semi-quantum key distribution system and method

A technology for quantum key distribution and arming

Pending Publication Date: 2021-10-29
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the embodiment of the present application is to provide a single-state half-quantum key distribution system and method, which uses selective modulation to realize the single-state half-quantum key distribution protocol, and solves the problem of unreasonable design of the protocol system in the prior art , simplifies the operation of the receiving end, and realizes a stable single-state semi-quantum key distribution protocol two-way experimental system, which has extremely high security and practical application feasibility

Method used

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Embodiment 1

[0053] see figure 1 , figure 1 It is a structural block diagram of a single-state half-quantum key distribution system in the embodiment of this application.

[0054] The single-state half-quantum key distribution system of the embodiment of the present application includes a sending end and a receiving end, wherein the sending end includes a signal light unit 1, an optical transmission unit 2, a phase modulator unit 3 and a detector unit 4, and the signal light unit 1. The optical transmission unit 2 and the phase modulator unit 3 are connected in sequence, the phase modulator unit 3 is connected to the receiving end, the detector unit 4 is connected to the phase modulator unit 3 and the optical transmission unit 2, and the phase modulator unit 4 is an unequal arm Interferometer;

[0055] The receiving end includes an intensity modulator unit 5, the intensity modulator unit 5 is connected to the non-equal interferometer, and the intensity modulator unit 5 is an interference...

Embodiment 2

[0082] see figure 1 and Figure 5 ,in, Figure 5 It is a schematic flow chart of a single-state half-quantum key distribution method in the embodiment of the present application. A single-state half-quantum key distribution method in the embodiment of the present application includes:

[0083] Step S110, the signal light unit 1 generates light pulses, and transmits them to the non-equal interferometer via the light transmission unit 2;

[0084] Step S120, the non-equal-arm interferometer processes the received optical pulses to obtain a first pulse group, and sends the first pulse group to the interference loop;

[0085] Step S130, the interference loop processes the received first pulse group to obtain a second pulse group, and sends the second pulse group to the non-equal interferometer;

[0086] Step S140, the non-equal arm interferometer processes the received second pulse group to obtain a third pulse group, and sends the third pulse group to the optical transmission u...

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Abstract

The invention provides a single-state semi-quantum key distribution system and method.The system comprises a sending end and a receiving end, the sending end comprises a signal light unit, a light transmission unit, a phase modulator unit and a detector unit, and the signal light unit, the light transmission unit and the phase modulator unit are sequentially connected; the detector unit is connected with the phase modulator unit and the light transmission unit, and the phase modulator unit is a non-equal-arm interferometer; the receiving end comprises an intensity modulator unit, the intensity modulator unit is connected with the phase modulator unit, and the intensity modulator unit is an interference loop; and the interference loop is used for loading voltage to the received optical pulse group sent by the non-equal-arm interferometer to obtain a processed optical pulse group, and sending the processed optical pulse group to the non-equal-arm interferometer. According to the system and the method, a selective modulation mode is adopted to realize a single-state semi-quantum key distribution protocol, the problem of unreasonable design of an existing system is solved, and the system and the method have extremely high safety and practical application feasibility.

Description

technical field [0001] This application relates to the field of quantum secure communication, in particular, to a single-state half-quantum key distribution system and method. Background technique [0002] At present, with the use of computers and the Internet in the field of communication, the encryption requirements for communication data are gradually increasing. Among data encryption methods, some encryption methods that depend on computational complexity still have a certain possibility of being deciphered, while quantum cryptography is based on Heisenberg’s uncertainty principle and the principle of uncloning of unknown quantum states, which can achieve In theory, it meets the requirements of the "one-time pad" encryption system and has theoretical unconditional security. [0003] Among them, in 1984, Bennett and Brassard proposed the first quantum key distribution protocol. After that, the communication parties of the quantum key distribution protocol are often defin...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/548H04B10/70
CPCH04L9/0852H04B10/548H04B10/70
Inventor 王金东黄钰涛韩思宇彭清轩沈琦琦魏正军於亚飞张智明
Owner SOUTH CHINA NORMAL UNIVERSITY
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