Asymmetry-based communication method of decoy-state quantum key distribution protocols

Abstract

The invention discloses an asymmetry-based communication method of decoy-state quantum key distribution protocols. The asymmetry-based communication method comprises the following steps that: a receiver and a sender establish a communication channel; the sender randomly generates a digital sequence and codes the digital sequence under multi-intensity light; if the light is in a signal state, coding is carried out under same basis vectors; if the light is in a weak decoy state, coding is carried out under a first basis vector or a second basis vector in different probabilities respectively; the sender sends coding information to the receiver; the receiver measures the coding information under the first basis vector or the second basis vector in different probabilities respectively, so that a source code is generated; and a shared key is screened from the source code according to the coding basis vector and the light intensity selected by the sender and the measurement basis vector selected by the receiver. According to the asymmetry-based communication method provided in the embodiment of the invention, on the premise of ensuring the communication security, the security key generation rate is increased by asymmetrically selecting the basis vectors; and thus, the systematic complexity is reduced.

Description

technical field [0001] The invention relates to the technical field of Internet communication, in particular to a communication method based on an asymmetric decoy state quantum key distribution protocol. Background technique [0002] The security of the quantum key distribution protocol is guaranteed by the basic laws of quantum mechanics. Among them, the most widely used quantum key distribution protocol is the BB84 protocol, but the BB84 protocol requires the light source to be a single-photon source, but in practice, the single-photon source is difficult to achieve. [0003] In practical applications, related technologies generally use a coherent light source, which easily leads to the existence of multi-photon components. Due to the photon number attack, the multi-photon component must be insecure, but the single-photon component and the multi-photon component are together, and it is difficult to distinguish, which greatly reduces the safe transmission distance of the ...

AI Technical Summary

Problems solved by technology

but not optimal

[0005] However, in the decoy-state BB84 protocol, it is assumed that Alice and Bob choose the base vectors for encoding and detection with the same probability. Intuitively, only half of the transmitted signals can be coded. Therefore, the decoy-state BB84 protocol is not the optimal method and needs to be solved. Improve

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