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Quantum secure direct communication protocol based on three-particle GHZ entangled state

A technology of secure direct communication and entanglement state, applied in key distribution, can solve the problem of no improvement

Active Publication Date: 2014-06-25
易迅通科技有限公司
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Problems solved by technology

In terms of security inspection, this method uses a part of the particles used for information transmission as verification particles, so in terms of security, this QSDC scheme does not improve like other existing QSDC schemes. Due to the influence of the eavesdropping party Eve, Its false detection rate is only 50%

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  • Quantum secure direct communication protocol based on three-particle GHZ entangled state
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Embodiment Construction

[0017] Assuming that the sender and receiver of the communication are Alice and Bob respectively, the specific steps of the quantum-safe direct communication protocol based on the three-particle GHZ entangled state of the present invention are as follows:

[0018] (1) Alice prepares N groups of particles in the GHZ entangled state, denoted as: [S 1 (A),S 1 (B),S 1 (C)], [S 2 (A),S 2 (B),S 2 (C)],,..., [S N (A),S N (B),S N (C)], where N>3, the GHZ entangled state is Then take out the first particles in all groups to form A sequence, which is recorded as: [S 1 (A),S 2 (A),S 3 (A),...,S N (A)], take out the second particles in all groups to form the B sequence, which is recorded as: [S 1 (B),S 2 (B),S 3 (B),....,S N (B)], take out the third particle in all groups to form C sequence, denoted as: [S 1 (C),S 2 (C),S 3 (C),....,S N (C)]; finally, extract a part of particles whose length is N2 and are entangled with each other from sequence A, sequence B, and seque...

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Abstract

The invention discloses a quantum secure direct communication protocol based on the three-particle GHZ entangled state. Alice prepares N groups of particles in the GHZ entangled state, and a sequence C'2 is sent to Bob; the Bob conducts single practical measurement on a sequence A21 and a sequence B21, the Alice conducts single practical measurement on a sequence C21, and it is determined that wiretapping exists if results of two measurements do not meet the corresponding relation; if the results of the two measurements meet the corresponding relation, A1 and B1 are encoded, particles in a sequence A22 and a sequence B22 are inserted into the A1 and the B1, the order of the particles is disrupted, and a sequence C'3 is generated and sent to the Bob; the Bob conducts single practical measurement on the sequence A22 and the sequence B22, the Alice conducts single practical measurement on a sequence C22, and it is determined that wiretapping exists if results of two measurements do not meet the corresponding relation; if the results of the two measurements meet the corresponding relation, the Bob conducts combined measurement on the A1, the B1 and a C1, and the information sent by the Alice is obtained. According to the quantum secure direct communication protocol based on the three-particle GHZ entangled state, the QSDC communication safety can be effectively improved, and the error detection rate reaches up to 62.5%.

Description

technical field [0001] The invention belongs to the field of quantum safe communication, and in particular relates to a quantum safe direct communication (QSDC) protocol based on a three-particle GHZ entangled state. Background technique [0002] Document 1 "Wang C, Deng F G, Long G L.Multi-step quantum secure direct communication using multi-particle Green–Horne–Zeilinger state[J]. Optics communications,2005,253(1):15-20." A method of constructing a quantum secure communication protocol (QSDC) using the GHZ entangled state of three particles is proposed, which has higher coding efficiency based on the dense encoding of the three-particle GHZ state than the Bell state. In terms of security inspection, this method uses a part of the particles used for information transmission as verification particles, so in terms of security, this QSDC scheme does not improve like other existing QSDC schemes. Due to the influence of the eavesdropping party Eve, Its false detection rate is o...

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Application Information

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IPC IPC(8): H04L29/06H04L9/08
Inventor 曹正文彭进业曾贵华白亚波
Owner 易迅通科技有限公司
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