Journal
OPTICS LETTERS
Volume 32, Issue 6, Pages 695-697Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.32.000695
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Quantum correlations among bright pump, signal, and idler beams produced by an optical parametric oscillator, all with different frequencies, are experimentally demonstrated. We show that the degree of entanglement between signal and idler fields is improved by using information on pump fluctuations. To our knowledge this is the first observation of three-color optical quantum correlations. (c) 2007 Optical Society of America.
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