Three-party quantum secure direct communication method based on hyper-entangled Bell state

Abstract

The invention discloses a three-party quantum secure direct communication method based on a hyper-entangled Bell state, including the following steps: a user 1 randomly prepares N hyper-entangled Bellstates and splits the Bell states into two sequences; the user 1 encodes a first sequence path and sends the path to a user 2; the user 2 encodes the path after confirming that no eavesdropping exists and sends the path to a user 3; the user 3 notifies the user 1 to send a second sequence after confirming that no eavesdropping exists; the user 1 performs polarization encoding on the second sequence and sends the second sequence to the user 3; the user 3 performs polarization encoding on the second sequence, performs joint hyper-entangled Bell state measurement on the two sequences, and publishes measurement results; the user 1 acquires encoding information of the user 2 and the user 3 respectively; the user 1 announces an initial state Ri and the encoding information R of the user 3 on XOR of the user 2; and the users 2 and 3 acquire the encoding information of the other two parties. According to the scheme of the invention, the transmission is only performed for three times, the probability of photon loss caused by channel loss can be greatly reduced, the security detection can be provided, and the security of transmission can be fully improved.

Description

technical field [0001] The invention relates to a three-party quantum safe direct communication method based on a super-entangled Bell state, belonging to the technical field of quantum communication. Background technique [0002] Quantum communication is a major branch of quantum informatics, mainly involving quantum key distribution, quantum teleportation, quantum secure direct communication, etc. The research on quantum key distribution and quantum teleportation started early, and the development has been quite mature. The concept of quantum secure direct communication was first proposed by Long et al. in 2002, and it has been a research hotspot in recent years. Different from quantum key distribution, quantum secure direct communication does not require both parties to generate keys in advance, but communicates by directly establishing a quantum channel, thus simplifying the quantum communication process in the general sense to a one-step quantum communication process, ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a three-party quantum secure direct communication method based on super-entangled Bell states, and solve the problem that in the existing quantum communication method, three parties need to prepare a single photon sequence at the same time, respectively Multiple transmissions are required to achieve communication, resulting in a higher probability of photon loss caused by channel loss

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