Entanglement in the above-threshold optical parametric oscillator
Alessandro S. Villar, Katiuscia N. Cassemiro, Kaled Dechoum, Antonio Z. Khoury, Marcelo Martinelli, Paulo Nussenzveig
Abstract
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 Δ2 p-=0.50(1), or -3.01(9) dB, and in the sum of phase quadratures are Δ2 +=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.
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