A Phase-Matching Quantum Key Distribution Method Based on Predicted Single-Photon Light Source

Abstract

The invention discloses a phase-matching quantum key distribution method based on a predicted single-photon light source. The invention uses the predicted single-photon light source as the signal light source of Alice and Bob, and then Alice and Bob respectively perform key encryption on the signal pulses output by the light source. Encode, and transmit the encoded signal pulse to the third party Charlie (Charlie can be an eavesdropper), based on Charlie's announcement of the results of the detector under effective interference, Alice and Bob obtain the screening key, and then amplify through negotiation and secret , the security key can be obtained between Alice and Bob. The invention effectively improves the key rate and communication distance of the phase-matching quantum key distribution protocol, and has the advantages of simple structure and convenient implementation, and is suitable for the application of the phase-matching quantum key distribution protocol For actual long-distance and high-quality communication, it has great application prospects.

Description

technical field [0001] The invention relates to a phase matching quantum key distribution method based on a predicted single-photon light source, and belongs to the field of quantum key distribution. Background technique [0002] In 1969, Wiesner, a quantum communication researcher at Columbia University, first proposed the concept of "quantum banknotes". This is the first time in the history of physics that the principles of quantum mechanics have been introduced into the field of communication, and it is also the first time that the concept of "quantum encryption" has been introduced. Appeared in front of the public, but due to many reasons such as the level of technology and experimental conditions at the time, this novel idea was not recognized. In 1979, Wiesner and his friend Bennett once again brought up the idea of ​​"quantum banknotes". Bennett showed a strong curiosity about this novel concept and began to conduct in-depth research on its application in the field of...

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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a phase-matching quantum key distribution method based on a forecasted single-photon light source. When considering the theoretical analysis of phase-matching quantum key distribution, a weakly coherent light source is used to output signals The pulse is then encoded, because the defect of the light source will lead to low key rate and short communication distance, so based on the theoretical characteristics of the predicted single-photon light source, the predicted single-photon light source is designed as the light source of the output signal pulse, the purpose is to obtain the agreement. A method with a higher key rate and a longer communication distance

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