We investigate entanglement in the above-threshold Optical Parametric Oscillator, both theoretically and experimentally, and discuss its potential applications to quantum information. The fluctuations measured in the subtraction of signal and idler amplitude quadratures are Δ2p^−=0.50(1), or −3.01(9) dB, and in the sum of phase quadratures are Δ2\hatq+=0.73(1), or −1.37(6) dB. A detailed experimental study of the noise behavior as a function of pump power is presented, and discrepancies with theory are discussed.
@article{arxiv.quant-ph/0610208,
title = {Entanglement in the above-threshold optical parametric oscillator},
author = {Alessandro S. Villar and Katiuscia N. Cassemiro and Kaled Dechoum and Antonio Z. Khoury and Marcelo Martinelli and Paulo Nussenzveig},
journal= {arXiv preprint arXiv:quant-ph/0610208},
year = {2015}
}
Comments
9 pages, 6 figs. Important reference for readers of quant-ph/0610197. J. Opt. Soc. Am. B, Feature Issue on Optical Quantum-Information Science, doc. ID 70938 (posted 5 September 2006, in press)