Detection of entanglement with polarized photons: experimental realization of an entanglement witness |
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Authors: | Barbieri M De Martini F Di Nepi G Mataloni P D'Ariano G M Macchiavello C |
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Institution: | Dipartimento di Fisica and Istituto Nazionale per la Fisica della Materia, Università di Roma La Sapienza, 00185 Rome, Italy. |
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Abstract: | 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. |
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