Quantum secure communication method and apparatus

Abstract

The invention provides a quantum secure communication method and apparatus. A relay device is respectively arranged on a quantum secure communication sending terminal and receiving terminal. The relay devices negotiate quantum keys with a directly connected upstream device and a downstream device respectively, and key relay processing and transmission are executed according to the quantum key negotiated with the directly connected upstream device and the downstream device and a key relay processing signal sent by the upstream device. End-to-end communication key sharing and quantum key communication are realized. Long-distance quantum key communication is realized through multi-core fibers and relay devices.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and device for quantum secret communication. Background technique [0002] Traditional secure communication technology guarantees its security based on the computational complexity of algorithms. With the rapid development of high-performance computing and quantum computing, its security is facing serious threats. Quantum key distribution, also known as quantum cryptography, uses the transmission and measurement of quantum superposition states to realize secure quantum key sharing between the two parties in communication. Its security comes from the physical characteristics of quantum mechanics and does not depend on computational complexity, excluding the possibility of computational cracking At the same time, any eavesdropping will lead to changes in the bit error rate of the channel and be noticed by both parties in communication. [0003] Optical fiber communi...

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Problems solved by technology

[0004] In a quantum secure communication system based on quantum key distribution, when the quantum state signal is mixed with the strong light signal of traditional optical communication, the background noise introduced by effects such as Rayleigh scattering and Raman scattering will overwhelm the quantum state signal, resulting in photon detection tor saturation or reception error

In addition, quantum key distribution also needs to rely on auxiliary channels to complete the transmission of auxiliary signals such as timing synchronization and key post-processing. It is also difficult for auxiliary signals and quantum state signals to be mixed with optical fibers.

[0005] At present, quantum secure communication systems need to occupy additional optical fiber resources for quantum key distribution, the transmission distance of quantum state signals is limited, and the key transmission rate is low, which has become an important bottleneck restricting the large-scale application of quantum key distribution.

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