A measurement-device-independent approach to quantum dialogue based on hyperentanglement

Abstract

The invention discloses a quantum dialogue method based on super-entanglement independent of measuring equipment. Two parties in the communication randomly prepare super-entangled states and single photons respectively to form corresponding photon sequences; Entanglement Bell states are measured, and the measurement results are announced. The communicating party conducts security testing based on the measurement results; the two communicating parties simultaneously encode information on different degrees of freedom and randomly perform security testing and encoding. This process is similar to quantum-safe direct communication on different degrees of freedom; The communication parties send the coded photon sequence to the detection party, and the detection party conducts the hyper-entangled Bell state measurement again and announces the result, and the communication party decodes the information based on the result to complete the dialogue. This method can realize two-way quantum-safe direct communication, effectively improves communication efficiency, and can eliminate security loopholes related to measurement equipment and information leakage, and has high flexibility, that is, information coding on different degrees of freedom does not affect each other.

Description

technical field [0001] The invention adopts the measurement device-independent quantum dialogue method realized by the super-entangled state, can realize two-way quantum safe direct communication, and belongs to the field of quantum safe communication. Background technique [0002] In 1984, Bennett and Brassard proposed the first quantum key distribution (QKD) protocol - BB84 protocol, marking the birth of quantum cryptography; Quantum Secure Direct Communication (QSDC) is different from QKD and is a new quantum communication The fundamental difference between QSDC and QKD is that QSDC does not need to generate a quantum key, and can directly transmit secret information in a quantum channel without leakage, which improves communication efficiency. In 2000, Long Guilu et al. proposed the first quantum-safe direct communication scheme—an efficient two-step QSDC scheme. In 2003, Deng Fuguo and others proposed a two-step QSDC protocol based on EPR entanglement pairs by using th...

AI Technical Summary

Problems solved by technology

[0005] In the existing QD protocols, although some protocols solve the security problems of information leakage and side channel attacks, their communication efficiency is not high.

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