Abstract

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.

© 2007 Optical Society of America

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

K. N. Cassemiro, A. S. Villar, M. Martinelli, and P. Nussenzveig
Opt. Express 15(26) 18236-18246 (2007)

Entanglement in the above-threshold optical parametric oscillator

Alessandro S. Villar, Katiúscia N. Cassemiro, Kaled Dechoum, Antonio Z. Khoury, Marcelo Martinelli, and Paulo Nussenzveig
J. Opt. Soc. Am. B 24(2) 249-256 (2007)

Experimental investigation of amplitude and phase quantum correlations in a type II optical parametric oscillator above threshold: from nondegenerate to degenerate operation

Julien Laurat, Laurent Longchambon, Claude Fabre, and Thomas Coudreau
Opt. Lett. 30(10) 1177-1179 (2005)

Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams

Xiaolong Su, Aihong Tan, Xiaojun Jia, Qing Pan, Changde Xie, and Kunchi Peng
Opt. Lett. 31(8) 1133-1135 (2006)

Transfer of intensity quantum correlation with twin beams

Hongxin Zou, Shuqin Zhai, Rongguo Yang, Daihe Fan, Jiangrui Gao, and Junxiang Zhang
Opt. Lett. 32(15) 2218-2220 (2007)