Relation between information and disturbance in quantum key distribution protocol with classical Alice

Details Relation between information and disturbance in quantum key distribution protocol with classical Alice Relation between information and disturbance in quantum key distribution protocol with classical Alice

2011-05-12

arxiv.org/abs/1105.2499v2

Physics

Quantum Physics

To appear in International Journal of Quantum Information

Scientific paper

The "semiquantum" key distribution protocol introduced by Zou et al. [Phys. Rev. A Vol.79, 052312 (2009)] is examined. The protocol while using two-way quantum communication requires only Bob to be fully quantum. We derive a trade-off inequality between information gained by Eve and the disturbance observed by legitimate users. It guarantees that Eve cannot obtain large information if the disturbance is sufficiently small.

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