Multi-degree-of-freedom-based quantum secure direct communication method irrelevant to measurement equipment

Abstract

The invention discloses a multi-degree-of-freedom-based quantum secure direct communication method irrelevant to measurement equipment. The method comprises the steps pf preparing quantum states of asending user and a receiving user; performing hyper-entangled Bell state measurement on the quantum states of the sending user and the receiving user to obtain an error bit rate; judging whether eavesdropping exists or not according to the error bit rate and the error rate threshold, and if not, encoding the quantum state of the sending user; and carrying out security detection on the encoded quantum state, judging whether the encoded quantum has wiretapping or not, and if not, obtaining the code of the sending user by the receiving user. Compared with the original MDI-QSDC, the protocol provided by the invention has larger channel capacity, and can ensure the communication security at the same time so as to prevent all possible attacks on a detector end.

Description

technical field [0001] The invention relates to quantum communication technology, in particular to a multi-degree-of-freedom quantum-safe direct communication method independent of measuring equipment. Background technique [0002] Quantum Secure Direct Communication (QSDC) is a very important branch in the field of quantum communication. Unlike quantum cryptography, QSDC can realize the secure transmission of information instead of only realizing the sharing of secure keys between the two parties in communication. In 2002, Professor Long Guilu and others proposed the concept of QSDC for the first time. However, in the practical quantum communication system, due to the imperfection of the device, there are still many loopholes in the QSDC system, and eavesdroppers will use these loopholes to achieve various attacks and obtain secure information without being discovered. Among the many attack methods, the detector side attack is the most frequent. [0003] In order to solve...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a quantum-safe direct communication method based on multi-degree-of-freedom that has nothing to do with the measurement equipment, so as to solve the problem of low security in the transmission process existing in the prior art

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