Entangled-photon six-state quantum cryptography

Details Entangled-photon six-state quantum cryptography Entangled-photon six-state quantum cryptography

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002njph....4...45e&link_type=abstract

New Journal of Physics, Volume 4, Issue 1, pp. 45 (2002).

Physics

7

Scientific paper

We have implemented the `six-state' quantum cryptography protocol using polarization-entangled photon pairs, in which the polarization of each photon of a pair is measured in one of three randomly chosen bases. For a given amount of eavesdropping, this protocol results in a larger error rate than in four- or two-state protocols, but reduces the number of key-producing events. We have experimentally investigated several incoherent eavesdropping strategies, and verified the predicted enhancement in error rate. However, we demonstrate that for low error rates, the efficiency for secret key generation is higher when using the four-state protocol.

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