Unambiguous state discrimination in quantum cryptography with weak coherent states

Details Unambiguous state discrimination in quantum cryptography with weak coherent states Unambiguous state discrimination in quantum cryptography with weak coherent states

1999-10-25

arxiv.org/abs/quant-ph/9910106v2

Physical Review A, Vol. 62, 022306 (2000).

Physics

Quantum Physics

10 pages, 6 figures, updated version with added discussion of beamsplitting attack

Scientific paper

10.1103/PhysRevA.62.022306

The use of linearly independent signal states in realistic implementations of quantum key distribution (QKD) enables an eavesdropper to perform unambiguous state discrimination. We explore quantitatively the limits for secure QKD imposed by this fact taking into account that the receiver can monitor to some extend the photon number statistics of the signals even with todays standard detection schemes. We compare our attack to the beamsplitting attack and show that security against beamsplitting attack does not necessarily imply security against the attack considered here.

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