Security of two-way quantum cryptography against asymmetric Gaussian attacks

Details Security of two-way quantum cryptography against asymmetric Gaussian attacks Security of two-way quantum cryptography against asymmetric Gaussian attacks

2008-07-11

arxiv.org/abs/0807.1937v2

Proc. SPIE, Vol. 7092, 709215 (2008)

Physics

Quantum Physics

Proceeding of the SPIE Conference "Quantum Communications and Quantum Imaging VI" - San Diego 2008. This paper is connected wi

Scientific paper

10.1117/12.793805

Recently, we have shown the advantages of two-way quantum communications in continuous variable quantum cryptography. Thanks to this new approach, two honest users can achieve a non-trivial security enhancement as long as the Gaussian interactions of an eavesdropper are independent and identical. In this work, we consider asymmetric strategies where the Gaussian interactions can be different and classically correlated. For several attacks of this kind, we prove that the enhancement of security still holds when the two-way protocols are used in direct reconciliation.

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