Phys. Rev. Lett. 83, 3103–3107 (1999)Nonmaximally Entangled States: Production, Characterization, and UtilizationReceived 14 June 1999; published in the issue dated 18 October 1999 Using a spontaneous-down-conversion photon source, we produce true nonmaximally entangled states, i.e., without the need for postselection. The degree and phase of entanglement are readily tunable, and are characterized both by a standard analysis using coincidence minima, and by quantum state tomography of the two-photon state. Using the latter, we experimentally reconstruct the reduced density matrix for the polarization. Finally, we use these states to measure the Hardy fraction, obtaining a result that is 122σ from any local-realistic result. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.3103
DOI:
10.1103/PhysRevLett.83.3103
PACS:
03.65.Bz, 03.67.-a, 42.50.Dv
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