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Decoy state quantum key distribution system based on discrete random phase

A key distribution system and decoy state quantum technology, applied in the field of communication, can solve the problems of reducing QKD, overestimating the error rate of single photon components, etc., and achieve the effect of simplifying the system and ensuring the security of communication

Active Publication Date: 2018-08-03
TSINGHUA UNIV +1
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  • Claims
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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
  • Decoy state quantum key distribution system based on discrete random phase
  • Decoy state quantum key distribution system based on discrete random phase

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Embodiment Construction

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "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, unless otherwise specifically defined.

[0026] In the present invention, unless otherwise clearly specified...

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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 technical field of communication, 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 the nature of quantum mechanics to ensure the security of communication, among which the BB84 protocol is the most famous quantum key distribution protocol. The BB84 protocol uses the polarization of light to communicate using photons as carriers of quantum states. The security of the BB84 protocol is based on the fact that non-orthogonal states cannot be completely resolved by measurement. [0003] However, in the related art BB84 protocol, the transmitting end is required to use a single photon source for information transmission. However, a 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 are ...

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Application Information

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