Information Leakage Problem in High-Capacity Quantum Secure Communication with Authentication Using Einstein - Podolsky - Rosen Pairs

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Journal Article
Chinese Physics Letters, 2016, 33 (7)
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© 2016 Chinese Physical Society and IOP Publishing Ltd. The information leakage problem often exists in bidirectional quantum secure direct communication or quantum dialogue. In this work, we find that this problem also exists in the one-way quantum secure communication protocol [Chin. Phys. Lett. 32 (2015) 050301]. Specifically, the first bit of every four-bit message block is leaked out without awareness. A way to improve the information leakage problem is given.
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