Quantum secure direct communication method irrelevant to measurement equipment in high-dimensional subspace

A technology of secure direct communication and measurement equipment, applied in the field of quantum secure direct communication, can solve the problems of security loopholes, low QSDC channel capacity, etc., and achieve the effect of increasing channel capacity

Active Publication Date: 2019-11-01
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The present invention aims at the problems of security loopholes in current QSDC and low channel capacity of QSDC irrelevant to measuring equipment, etc., and provides a quant

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  • Quantum secure direct communication method irrelevant to measurement equipment in high-dimensional subspace
  • Quantum secure direct communication method irrelevant to measurement equipment in high-dimensional subspace
  • Quantum secure direct communication method irrelevant to measurement equipment in high-dimensional subspace

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[0015] In order to facilitate the understanding and implementation of the present invention by those of ordinary skill in the art, the present invention will be further described in detail and in-depth below with reference to the accompanying drawings.

[0016] like figure 1 As shown, Alice and Bob communicate, Alice is the sender, Bob is the receiver, Charlie is an untrusted third party, and Charlie performs Bell State Measurement (BSM) on the sequence sent by Alice and Bob. Charlie is arranged with N beam splitters (Beam Splitter, BS), each beam splitter corresponds to two detectors, the detectors corresponding to Alice's detectors are odd-numbered, and the detectors corresponding to Bob's detectors are numbered. is an even number. like figure 1 In the structure shown, both Alice and Bob have N channels to choose from. Combine below figure 1 To illustrate the high-dimensional measurement device-independent quantum-safe direct communication method of the present invention...

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Abstract

The invention provides a quantum secure direct communication method irrelevant to measurement equipment in a high-dimensional subspace. A sender Alice and a receiver Bob perform Bell state measurementthrough an untrusted third-party Charlie, and then according to a measurement result, the Alice executes a space unitary operation to encode a message for transmission. According to the method, whenBell state measurement is carried out, Alice randomly prepares N EPR pairs under a Z base or an X base, a particle is taken out from each EPR pair to form a sequence PA, Bob also prepares a sequence PB, and the state of the sequence PB is one of quantum states on the Z base or the X base under an N-dimensional space; particles in PA and PB are simultaneously generated to Charlie, and Bell state measurement is carried out. According to the invention, the loopholes of all measuring ends are thoroughly eliminated, and the channel capacity and the information transmission security are improved.

Description

technical field [0001] The invention belongs to the field of quantum security communication, and relates to a quantum security direct communication method irrelevant to measuring equipment in a multidimensional subspace. Background technique [0002] Compared with classical information, quantum information is characterized by the superposition of quantum states and the existence of quantum entanglement. In addition, there are high-dimensional forms of quantum states, that is, through appropriate encoding methods, the amount of information that can be stored in each quantum state can exceed 1 bit. Therefore, the high-dimensional quantum state shows a strong information storage capacity. At the same time, the application of high-dimensional quantum to the computing system can achieve the purpose of improving the calculation speed, and it can also provide faster and safer quantum communication when applied to the field of communication. Therefore, The preparation of high-dimen...

Claims

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Application Information

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IPC IPC(8): H04B10/70H04L9/08H04L29/06
CPCH04B10/70H04L9/0852H04L63/1416H04L63/1433
Inventor 李琳依王川王铁军刘璐
Owner BEIJING UNIV OF POSTS & TELECOMM
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