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This paper establishes a channel model by analyzing various factors which affect the quantum state in the process of practical quantum communication, and derives, through calculation and simulation, a new formula for a safety threshold of eavesdropping discrimination by the BB84 Protocol. This formula can be used to estimate the safety communication threshold of the BB84 Protocol in non-ideal channels...
A new eavesdropping strategy for BB84 quantum key distribution protocol is proposed. This scheme is a new kind of intercept/resend strategy based on Breidbart basis. Under this scheme, eavesdropper can not only exactly obtain the exchanged information between legitimate users but also decrease the probability of being detected.
The proposed protocols of quantum secure direct communication based on single photons up-to-date are almost two-way communication protocols, in which the probability of Trojan horse attack reduces the security of the communication. The aim of photons transferred forward and backward is to let the receiver know the code bases and the initial states of the photons. One-way quantum secure direct communication...
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