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Quantum Secure Direct Communication with Private Dense Coding Using a
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DOI：10.1103/PhysRevApplied.17.064011.png)
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摘要
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We study quantum secure direct communication using a general preshared quantum state and a generalization of dense coding. In this scenario, Alice is allowed to apply a unitary operation on the preshared state to encode her message, and the set of allowed unitaries forms a group. To decode the message, Bob is allowed to apply a measurement across his system and the system he receives. In the worst scenario, we guarantee that Eve obtains no information for the message even when Eve accesses the joint system between the system that she intercepts and her original system of the preshared state. For a practical application, we propose a concrete protocol and derive an upper bound of information leakage in the finite-length setting. We also discuss how to apply our scenario to the case with discrete Weyl-Heisenberg representation when the preshared state is unknown.
Keyword:
PHYSICAL LAYER SECURITY
CHANNEL POLARIZATION
CLASSICAL CAPACITY
STRONG CONVERSE
ENTANGLEMENT
CODES
PROTOCOL
KEY
期刊
IF:
4.4
论文数:
7.1K
被引数:
2.8W
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