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Decoy-state quantum key distribution system based on discrete random phase

A key distribution system, a technology for deceiving state quantum, applied in the field of communication, can solve the problems of reducing QKD, overestimating the error rate of single photon components, etc., to simplify the system and ensure the effect of communication security

Active Publication Date: 2015-04-29
TSINGHUA UNIV +1
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Problems solved by technology

If the BB84 protocol in the related art is used, the error rate of the single-photon component can only be estimated according to the worst case, that is, all errors of the key obtained by the transmitting end and the receiving end are considered to occur in the single-photon component, resulting in Greatly overestimate the error rate of single photon components, thus greatly reducing the farthest transmission distance of the QKD (Quantum Key Distribution, quantum key distribution) system

Method used

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  • Decoy-state quantum key distribution system based on discrete random phase
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Embodiment Construction

[0024] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless specifically defined otherwise.

[0026] In the present inventi...

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Abstract

The invention discloses a decoy-state quantum key distribution (QKD) system based on a discrete random phase. The decoy-state quantum key distribution system comprises a light source which adopts a coherent light source, a first phase regulator used for regulating n (n is a positive integer) discrete random coherent-state phase information alpha for encoding, and a QKD encoder used for QKD encoding. According to the distribution system disclosed by the embodiment of the invention, the coherent light source is adopted and the phase regulator is used for regulating the n discrete random coherent-state phase information alpha for QKD encoding, so that the implementation of a decoy-state protocol is simplified, communication safety is guaranteed, and the QKD system is simplified.

Description

Technical field [0001] The invention relates to the field of communication technology, in particular to a decoy state quantum key distribution system based on discrete random phases. Background technique [0002] In related technologies, quantum key distribution relies on quantum mechanical properties to ensure the security of communication, and the BB84 protocol is the most famous quantum key distribution protocol. The BB84 protocol uses the polarization of light and uses photons as the carrier of quantum states for communication. The security of the BB84 protocol is based on the fact that non-orthogonal states cannot be completely distinguished by measurement. [0003] However, in the related technology BB84 protocol, the transmitter is required to use a single photon source for information transmission. The perfect single-photon source does not exist in practical applications. In practice, the light source can generally be considered as a coherent state. If there is a multi-...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
Inventor 马雄峰张振罗开广
Owner TSINGHUA UNIV
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