Continuous variable measurement equipment independent quantum key distribution method based on quantum scissors

A technology for quantum key distribution and measurement equipment, applied in the field of quantum secure communication, can solve the problem that the performance of the Gaussian modulation CV-MDI-QKD system needs to be further improved, and achieve the improvement of key rate and communication distance, performance, and information. The effect of noise ratio

Pending Publication Date: 2022-07-05
NORTHWEST UNIV(CN)
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Problems solved by technology

[0004] For the deficiencies in the prior art, the purpose of the present invention is to provide a continuous variable measurement device-independent quantum key distribution method based on quantum scissors, to solve the performance problem of the Gaussian modulation CV-MDI-QKD system in the prior art. Raised technical issues

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  • Continuous variable measurement equipment independent quantum key distribution method based on quantum scissors
  • Continuous variable measurement equipment independent quantum key distribution method based on quantum scissors
  • Continuous variable measurement equipment independent quantum key distribution method based on quantum scissors

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Embodiment

[0029] This embodiment provides a device-independent quantum key distribution method for continuous variable measurement based on quantum scissors, such as figure 1 As shown, including the Gaussian modulation CV-MDI-QKD system, the Gaussian modulation CV-MDI-QKD system includes the sender Alice end and the receiver Bob end, this method is introduced in the Bob end of the Gaussian modulation CV-MDI-QKD system installed the quantum scissors device and performed the following steps:

[0030] In step S1, quantum states are prepared at the Alice end and the Bob end, respectively, and quantum signals at the Alice end and the Bob end are obtained;

[0031] Step S2, Alice and Bob respectively send the quantum signal to the untrusted third party Charlie, the untrusted third party Charlie interferes with the received quantum signal through the 50:50 beam splitter, and uses the homodyne detector to detect the quantum signal. The result after the interference is measured, and the measure...

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Abstract

The invention provides a continuous variable measurement equipment-independent quantum key distribution method based on quantum scissors, which comprises the following steps: step S3, after an Alice end and a Bob end receive a measurement result published by Charlie, the Bob end performs translation operation on a quantum state of the measurement result to obtain a new quantum state mode; and S4, introducing a quantum scissor device into the Bob end, placing the quantum scissor device at a position after the translation operation and before the heterodyne detector, amplifying a new quantum state mode after the quantum scissor device receives the new quantum state mode after the translation operation, and then sending the amplified quantum state to the heterodyne detector of the Alice end and the Bob end for measurement. According to the invention, the signal-to-noise ratio of a transmission signal is improved, the key rate and the communication distance of the system are improved, and the performance of the continuous variable measurement equipment-independent quantum key distribution system based on Gaussian modulation is improved.

Description

technical field [0001] The invention belongs to the technical field of quantum secret communication, relates to quantum key distribution, and in particular relates to a quantum scissors-based continuous variable measurement device-independent quantum key distribution method. Background technique [0002] Quantum key distribution (QKD) is an encryption technology that uses quantum mechanical properties to ensure communication security, which enables legitimate communication parties (Alice and Bob) to generate and share a random, Secure keys to encrypt and decrypt messages. Based on Heisenberg's uncertainty principle and the law of unclonability, quantum key distribution has theoretical unconditional security. At present, quantum key distribution protocols are mainly divided into continuous variable quantum key distribution (CVQKD) protocols and discrete variable quantum key distribution (DVQKD) protocols. Among them, the continuous variable quantum key distribution protocol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04L9/0858H04B10/70Y04S40/20
Inventor 刘维琪孔令志荆凡张哲坤贺晨
Owner NORTHWEST UNIV(CN)
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