Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Measurement of three-color optical quantum correlations in the above-threshold optical parametric oscillator

K. N. Cassemiro, Alessandro S. Villar, M. Martinelli, P. Nussenzveig

Published Jun 1, 2007• 0 citations

Abstract

This paper presents an experimental demonstration of three-color quantum correlations between the bright pump, signal, and idler beams produced by an optical parametric oscillator (OPO). This paper shows that the degree of entanglement between the twin beams can be increased by using information from the pump beam.

DOI: 10.1109/cleoe-iqec.2007.4386792

Related papers

Experimental observation of three-color optical quantum correlations

Cassemiro, K N, M. Martinelli, Nussenzveig, P +2 more

Quantum correlations between 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 of pump fluctuations. This is the first observation of three-color optical quantum correlations.

Oct 23, 200627 citations

Entanglement and quantum correlations in the optical parametric oscillator above threshold

K. N. Cassemiro, Alessandro S. Villar, Paulo Valente +2 more

We describe several recent experimental studies in the above-threshold optical parametric oscillator (OPO). Seventeen years after the original prediction, entanglement of the twin beams was experimentally demonstrated in 2005. It was followed by the prediction that the OPO should directly produce tripartite pump-signal-idler entangled beams. We also present experimental quantum correlations among these three fields.

Journal of Physics Conference SeriesOct 1, 20070 citations

Experimental observation of three-color optical quantum correlations

Katiúscia N. Cassemiro, Alessandro S. Villar, Paulo Valente +2 more

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.

arXiv:quant-ph/0610197Optics LettersFeb 15, 200728 citations

Bright Entangled Beams from an Above-Threshold Optical Parametric Oscillator

K. N. Cassemiro, Alessandro S. Villar, Paulo Valente +2 more

We generated bright entangled beams in an optical parametric oscillator, operating above threshold. Tripartite pump-signal-idler entanglement, all with different frequencies, was also predicted and three-color quantum correlations already measured.

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meetingJan 1, 20071 citation

Experimental three-color optical quantum correlations

K. N. Cassemiro, Alessandro S. Villar, Paulo Valente +2 more

We produced and experimentally demonstrated quantum correlations between bright pump, signal, and idler beams in an optical parametric oscillator, all with different frequencies, Our group was the first to observe three-color optical quantum correlations.

Quantum Electronics and Laser Science ConferenceMay 1, 20070 citations

The quest for three-color entanglement: experimental investigation of new multipartite quantum correlations

K. N. Cassemiro, A. S. Villar, M. Martinelli +1 more

We experimentally investigate quadrature correlations between pump, signal, and idler fields in an above-threshold optical parametric oscillator. We observe new quantum correlations among the pump and signal or idler beams, as well as among the pump and a combined quadrature of signal and idler beams. A further investigation of unforeseen classical noise observed in this system is presented, which hinders the observation of the recently predicted tripartite entanglement. In spite of this noise, current results approach the limit required to demonstrate three-color entanglement.

arXiv:0709.3335Optics ExpressJan 1, 200723 citations