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Phys Rev Lett. 2006 May 19;96(19):190501. Epub 2006 May 17.

Complete deterministic linear optics Bell state analysis.

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1
Department für Physik, Ludwig-Maximilians-Universität, München, Germany.

Abstract

We show how hyperentanglement allows us to deterministically distinguish between all four polarization Bell states of two photons. In this proof-of-principle experiment, we employ the intrinsic time-energy correlation of photon pairs generated with high temporal definition in addition to the polarization entanglement obtained from parametric down-conversion. For the identification, no nonlinear optical elements or auxiliary photons are needed. The new possibilities this complete Bell measurement offers are demonstrated by realizing an optimal dense coding protocol.

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