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A two-step quantum-safe direct communication method based on continuous variables

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

Active Publication Date: 2020-06-05
NORTHWEST UNIV
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  • 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

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  • A two-step quantum-safe direct communication method based on continuous variables
  • A two-step quantum-safe direct communication method based on continuous variables
  • A two-step quantum-safe direct communication method based on continuous variables

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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 two-step quantum secure direct communication method based on continuous variables, comprising: the sender randomly selects a compression operator S(r) to prepare a dual-mode squeezed state light S A S B , the detection light S B Send to the receiver for channel detection and identity authentication; after confirming the channel security and completing identity authentication; the sender uses block transmission to encode the information in the signal light S A and sent to the receiver. The receiver recovers the original information sequence by comparing the detection bits in the information block. The invention simultaneously completes identity authentication in the channel detection stage, which can effectively avoid man-in-the-middle attacks; in the information transmission stage, the receiver judges whether there is eavesdropping by detecting bits, and through joint measurement, both the amplitude and phase of the light beam can obtain secret information, which Communication efficiency can reach 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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Patent Type & Authority Patents(China)
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