Entanglement in the above-threshold optical parametric oscillator

Details Entanglement in the above-threshold optical parametric oscillator Entanglement in the above-threshold optical parametric oscillator

2006-10-24

arxiv.org/abs/quant-ph/0610208v1

Physics

Quantum Physics

9 pages, 6 figs. Important reference for readers of quant-ph/0610197. J. Opt. Soc. Am. B, Feature Issue on Optical Quantum-Inf

Scientific paper

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 $\Delta^2 \hat p_-=0.50(1)$, or $-3.01(9)$ dB, and in the sum of phase quadratures are $\Delta^2 \hatq_+=0.73(1)$, 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.

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