Abstract
Quantum secure direct communication is a new communication mode in the free space. Quantum secure direct communication utilizes single photon with the information to transmit ciphertext in the quantum channel directly, and it distinguishes from Quantum key distribution. Its outstanding characteristics are as follows: super velocity of light, high power capacity, high security, and anti-interference, so quantum secure direct communication can break the traditional secret communication frame to ensure the absolute secure communication. However, the imperfection of optical devices can leave loopholes for quantum attacks. Based on free space, this paper puts forward one kind of attack detection method in the field of quantum secure direct communication. This paper introduces quantum bit error rate analysis and decoy-state photon transmission rate analysis for designing security detection process to effectively detect the eavesdropping and improve security.
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