Phys. Rev. Lett. 91, 227901 (2003) [4 pages]Detection of Entanglement with Polarized Photons: Experimental Realization of an Entanglement WitnessReceived 7 July 2003; published 24 November 2003 We report on the first experimental realization of an entanglement witness, a method to detect entanglement with few local measurements. The present demonstration has been performed with polarized photons in Werner states, a well-known family of mixed states that can be either separable or nonseparable. The Werner states are generated by a novel high brilliance source of bipartite entangled states by which the state mixedness can be easily adjusted. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.227901
DOI:
10.1103/PhysRevLett.91.227901
PACS:
03.67.Mn, 03.65.Ud, 03.65.Wj, 42.65.Lm
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