Experimental investigation of quantum key distribution with position and momentum of photon pairs

Details Experimental investigation of quantum key distribution with position and momentum of photon pairs Experimental investigation of quantum key distribution with position and momentum of photon pairs

2004-11-25

arxiv.org/abs/quant-ph/0411183v2

Physics

Quantum Physics

6 pages, 6 figures, subimitted for publication

Scientific paper

10.1103/PhysRevA.72.022313

We investigate the utility of Einstein-Podolsky-Rosen correlations of the position and momentum of photon pairs from parametric down-conversion in the implementation of a secure quantum key distribution protocol. We show that security is guaranteed by the entanglement between downconverted pairs, and can be checked by either direct comparison of Alice and Bob's measurement results or evaluation of an inequality of the sort proposed by Mancini et al. (Phys. Rev. Lett. 88, 120401 (2002)).

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