TY - JOUR
T1 - Nonmaximally entangled states
T2 - Production, characterization, and utilization
AU - White, Andrew G.
AU - James, Daniel F.V.
AU - Eberhard, Philippe H.
AU - Kwiat, Paul G.
PY - 1999
Y1 - 1999
N2 - 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
AB - 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
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U2 - 10.1103/PhysRevLett.83.3103
DO - 10.1103/PhysRevLett.83.3103
M3 - Article
AN - SCOPUS:0000737842
SN - 0031-9007
VL - 83
SP - 3103
EP - 3107
JO - Physical review letters
JF - Physical review letters
IS - 15
ER -