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Continuous variable-based two-step quantum secure direct communication method

A secure direct communication, quantum technology, applied in secure communication devices, photon quantum communication, key distribution, can solve problems such as low communication efficiency, and achieve the effect of improving security and avoiding attacks

Active Publication Date: 2018-10-23
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a two-step quantum-safe direct communication method based on continuous variables to solve the problem of low communication efficiency in the prior art

Method used

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  • Continuous variable-based two-step quantum secure direct communication method
  • Continuous variable-based two-step quantum secure direct communication method
  • Continuous variable-based two-step quantum secure direct communication method

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Embodiment 1

[0033] This embodiment provides a two-step quantum-safe direct communication method based on continuous variables. This embodiment assumes that Alice and Bob are legal senders and receivers in the quantum communication process, such as figure 1 , figure 2 shown, including the following steps:

[0034] Step 1, the sender Alice randomly selects the dual-mode compression operator S(r) to act on the vacuum state |0> 1 ,|0> 2 , to obtain the dual-mode squeezed state light S A , S B ;

[0035] In step 1, the sender randomly selects the dual-mode compression operator S(r) to act on the vacuum state |0> 1 ,|0> 2 , the dual-mode squeezed state light S can be obtained by formula (1) A , S B :

[0036]

[0037]

[0038] In formula (1), r is the compression coefficient, |0> 1 ,|0> 2 Respectively represent the vacuum state; Respectively |0> 1 ,|0> 2 the Hermitian conjugate of is a bimodal compression transform; a 1 、a 2 to generate operators; is the annihilation...

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Abstract

The invention provides a continuous variable-based two-step quantum secure direct communication method. The method comprises the steps that a sending party selects a squeezed operator S(r) randomly toprepare two-mode squeezed light S and S, sends detection light S to a receiving party to perform channel detection and identity authentication; after the channel is confirmed secure and identity authentication is finished, the sending party codes information on signal light S through block transmission and sends the signal light to the receiving party, and the receiving party comparesdetection bits in information blocks so as to recover an original information sequence. Identity authentication is finished during channel detection, so that attach by an intermediary is prevented effectively; and in the information transmission stage, the receiving party determines eavesdropping through detection bits, secret information can be obtained in amplitude and phase of a beam through joint measurement, and the communication efficiency reaches 100%.

Description

technical field [0001] The invention belongs to the technical field of quantum security communication, and in particular relates to a two-step quantum security direct communication method based on continuous variables. Background technique [0002] Quantum communication uses the principle of quantum mechanics for information transmission and processing, which has the advantages of high security and high capacity. Quantum secure direct communication is a new type of quantum communication mode that directly transmits secret information in quantum channels, and has developed rapidly in recent years. [0003] "Yuan L, Ji C, Ji S, et al.Continuous Variable Quantum Secure DirectCommunication in Non-Markovian Channel[J].International Journal of Theoretical Physics,2015,54(6):1968-1973." proposed a non-Markovian Continuous variable quantum-safe direct communication protocol based on bimodal continuous variable correlation under Cove channel. The scheme uses two sets of Gaussian co...

Claims

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Application Information

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IPC IPC(8): H04B10/70H04L9/08
CPCH04B10/70H04L9/0858
Inventor 曹正文柴庚曾贵华彭进业李建坤贺晨
Owner NORTHWEST UNIV
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