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Differential non-Gauss operation radioactivity continuous variable quantum key distribution method

A quantum key distribution, radioactive technology, applied in key distribution, can solve problems such as no method, limited practical application, etc.

Inactive Publication Date: 2014-04-23
CENT SOUTH UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a differential non-Gaussian operation radioactive continuous variable quantum key distribution method, which solves the problem that the current quantum key distribution method does not have a method based on non-Gaussian modulation, which limits practical applications

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  • Differential non-Gauss operation radioactivity continuous variable quantum key distribution method
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  • Differential non-Gauss operation radioactivity continuous variable quantum key distribution method

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Embodiment Construction

[0028] A differential non-Gaussian operation radioactive continuous variable quantum key distribution method of the present invention such as figure 1 As shown, through a neutral participant, Fred, a Gaussian source of entanglement is established between two distant participants, Alice and Bob, in order to generate a key-rate encryption in a radial quantum network.

[0029] Step 1: Fred, a trusted third party, uses a laser generator to prepare a dual-mode vacuum squeezed state denoted as ρ ab , where α 2 =V 0 / 2, and V 0 represents the modulation variance of a single-mode squeezed state with variance 2α 2 +1. Two-mode vacuum compressed state ρ ab The purpose is to send one mode to Alice through the fiber with transmission efficiency T and extra noise ε while the other mode is sent to Bob through the fiber with the same transmission efficiency T and extra noise ε, and the vacuum state of the two modes is the same. After the photons pass through the beam splitter, they und...

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Abstract

The invention discloses a differential non-Gauss operation radioactivity continuous variable quantum key distribution method. A trusted third party Fred prepares a dual-mode vacuum compression state which is marked as rho[ab] by use of a laser generator, a photon undergoes beam dividing of the dual-mode vacuum compression state rho[ab] and then undergoes double-mode unitary transformation Uab<^> to commonly generate a double-mode vacuum compression state phi>a0b0, at the moment, the output modes of the photon are respectively marked as a0 and b0, photon subtraction operation is used to realize non-Gauss operation to respectively obtain a mode a1 and a mode b1, when Alice and Bob receive photon output modes a2 and b2 transmitted by a noise channel, a heterodyne detector is utilized to perform detection for secret negotiation and error correction, and finally, a secret key is extracted and obtained for data encryption. The method provided by the invention has the following advantages: non-Gauss modulation is realized at a source by use of a photon number distinguishing detector, and the security of secret key transmission in a quantum communication system is improved.

Description

technical field [0001] The invention belongs to the technical field of quantum security communication, and relates to a differential non-Gaussian operation radioactive continuous variable quantum key distribution method. Background technique [0002] Continuous variable QKD is encoded by the orthogonality of the photon fields x and p and extracted using homodyne or heterodyne detection. For the original discrete variable QKD was chosen because it provides higher detection efficiency, Off-the-shelf laser sources are more easily integrated into current communication systems. The past decade has produced significant progress in continuously variable quantum key distribution. Many recent results include proofs of unconditional security against arbitrary potential attack strategies. However, security analysis relies too much on the assumption that the quantum channel is linear. Recently, Guo et al. have proposed an improved four-state EBCVQKD scheme in which legitimate partici...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
Inventor 王硕王萍郭迎王博金玲攀赵志胜施荣华
Owner CENT SOUTH UNIV
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