Equipment-independent quantum secure direct communication method based on single photon source

Abstract

The invention provides a device-independent quantum secure direct communication method based on a single photon source. Two communication parties use a single photon source to generate a single photon, the two parties send the single photon to a third party for Bell state measurement, and a measurement result can indicate whether the two parties successfully establish an entanglement channel or not. And then, the information sender encodes the photons in the hand and sends the photons to an information receiver for Bell state measurement so as to read the secret information transmitted by the sender. The security of the two rounds of photon transmission process is ensured by an equipment-independent security detection method. Due to the fact that the probability that the single photon source generates the single photon is far higher than the probability that the entanglement source generates the photon entanglement state, the method can effectively improve the actual safety information capacity of the DI-QSDC, meanwhile, the influence of photon transmission loss on communication safety can be eliminated through an indication method, the information loss rate and the error rate are reduced, and the communication distance is effectively prolonged. In addition, the Bell state measurement equipment is based on linear optics and can be realized under the current experiment condition.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, and in particular relates to a device-independent quantum safe direct communication method based on a single photon source. Background technique [0002] Quantum communication refers to the use of the basic principles of quantum mechanics to realize the transmission of information. Quantum communication has the function of perceptual eavesdropping and has absolute security, which is its biggest advantage different from classical communication. Quantum communication includes many research branches, such as quantum key distribution (QKD) and quantum secure direct communication (QSDC). QKD can distribute a series of security keys between sender and receiver. In QKD, in order to achieve secure communication, both the sender and the receiver must ensure that the encryption, key distribution, and decryption processes are absolutely secure. Unlike QKD, QSDC provides a new way of secure ...

AI Technical Summary

Problems solved by technology

However, the existing DI-QSDC schemes use photon entanglement sources (parametric down-conversion entanglement sources) to prepare entangled states, and the preparation efficiency is low (~10 -3 -10 -5 ), and in the process of distributing entanglement, the loss of photon transmission has a great impact on the security of communication

The above two points lead to the low safety information capacity and short safety communication distance of the existing DI-QSDC

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