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Entanglement in the above-threshold optical parametric oscillator

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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 Δ2p̂=0.50(1), or 3.01(9) dB, and in the sum of phase quadratures they are Δ2q̂+=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 the discrepancies with theory are discussed.

© 2007 Optical Society of America

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