期刊
CHINESE PHYSICS LETTERS
卷 28, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/28/10/100301
关键词
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资金
- National Natural Science Foundation of China [60872052]
Recently, Boyer et al. presented a novel semiquantum key distribution protocol [Phys. Rev. Lett. 99 (2007) 140501] by using four quantum states, each of which is randomly prepared in the.. or.. basis. Here we present a semiquantum key distribution protocol by using maximally entangled states in which quantum Alice shares a secret key with classical Bob. Quantum Alice has the ability to prepare Bell states and perform Bell basis or computational basis measurement. Classical Bob is restricted to measuring, preparing a particle in the computational basis, reflecting or reordering the particles. The qubit efficiency of the protocol improves to 50% and the protocol can be modified to a measure-resend protocol or a protocol without quantum memory. We also show that the protocol is secure against eavesdropping.
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