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Paper detail

Security of quantum key distribution with state-dependent imperfections

In practical quantum key distribution (QKD) system, the state preparation and measurement are imperfect comparing with the ideal BB84 protocol, which are always state-dependent in practical realizations. If the state-dependent imperfections can not be regarded as an unitary transformation, it should not be considered as part of quantum channel noise introduced by the eavesdropper, the commonly used secret key rate formula GLLP can not be applied correspondingly. In this paper, the unconditional security of quantum key distribution with state-dependent imperfection has been analyzed by estimating the upper bound of the phase error rate about the quantum channel.

preprint2011arXivOpen access
Hong-wei LiZhen-Qiang YinZheng-Fu HanWan-Su BaoGuang-Can Guo
quant-ph
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Hong-wei LiZhen-Qiang YinZheng-Fu HanWan-Su BaoGuang-Can Guo

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