Security of new two-way continuous-variable quantum key distribution protocol

Details Security of new two-way continuous-variable quantum key distribution protocol Security of new two-way continuous-variable quantum key distribution protocol

2011-10-09

arxiv.org/abs/1110.1818v3

Physics

Quantum Physics

9 pages, 3 figures

Scientific paper

The original two-way continuous-variable quantum-key-distribution (CV QKD) protocols [S. Pirandola, S. Mancini, S. Lloyd, and S. L. Braunstein, Nature Physics 4, 726 (2008)] give the security against the collective attack on the condition of the tomography of the quantum channels. We propose a family of new two-way CV QKD protocols and prove their security against general collective attack without the tomography of the quantum channels. The simulation result indicates that the new protocols maintain the same advantage as the original two-way protocols whose tolerable excess noise surpasses that of the one-way CV-QKD protocol. We also show that all sub-protocols within the family have higher secret key rate and much longer transmission distance than the one-way CV-QKD protocol for the noisy channel.

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