Quantum key distribution using polarized coherent states

Details Quantum key distribution using polarized coherent states Quantum key distribution using polarized coherent states

2004-03-09

arxiv.org/abs/quant-ph/0403076v4

Int. J. Mod. Phys. B., 20, 1287 (2006)

Physics

Quantum Physics

Inclusion of a discussion about noise not controlled by Eve; inclusion of a figure. A simplified version of this paper was sub

Scientific paper

10.1142/S0217979206033929

We discuss a continuous variables method of quantum key distribution employing strongly polarized coherent states of light. The key encoding is performed using the variables known as Stokes parameters, rather than the field quadratures. Their quantum counterpart, the Stokes operators $\hat{S}_i$ (i=1,2,3), constitute a set of non-commuting operators, being the precision of simultaneous measurements of a pair of them limited by an uncertainty-like relation. Alice transmits a conveniently modulated two-mode coherent state, and Bob randomly measures one of the Stokes parameters of the incoming beam. After performing reconciliation and privacy amplification procedures, it is possible to distill a secret common key. We also consider a non-ideal situation, in which coherent states with thermal noise, instead of pure coherent states, are used for encoding.

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