Quantum Secure Direct Communication Scheme in the Non-symmetric Channel with High Efficiency and Security
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By analyzing the basic properties of a class of three-particle W states, we show how to establish a non-symmetric channel to realize a quantum dense code scheme, each quantum pair can carry log2 18 bits of classical message by employing different kinds of unitary transformation in three-dimensional Hilbert space, which can improve the transmission efficiency of classical message. Based on this quantum dense code, we propose a novel quantum secure direct communication scheme. The security of the scheme is also discussed in detail, and the error rate for eavesdropper is 50 %.
KeywordsQuantum secure direct communication Quantum dense code Three-particle W states Non-symmetric channel Error rate
This work was supported by the Natural Science Special Fund of Department of Education in Shaanxi in 2012 (No. 12JK0497) and Natural Fund of Science in Shaanxi in 2013 (No.2013JM8036).