Physics – Quantum Physics
Scientific paper
2004-07-19
Phys. Rev. Lett. 94, 020505 (2005)
Physics
Quantum Physics
See also F. Grosshans, quant-ph/0407148
Scientific paper
10.1103/PhysRevLett.94.020505
Security bounds for key distribution protocols using coherent and squeezed states and homodyne measurements are presented. These bounds refer to (i) general attacks and (ii) collective attacks where Eve interacts individually with the sent states, but delays her measurement until the end of the reconciliation process. For the case of a lossy line and coherent states, it is first proven that a secure key distribution is possible up to 1.9 dB of losses. For the second scenario, the security bounds are the same as for the completely incoherent attack.
Acin Antonio
Navascues Miguel
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