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 ${\Delta }^2{\widehat{p}}_{-}=0.50\left(1\right)$, or $-3.01\left(9\right)$ dB, and in the sum of phase quadratures they are ${\Delta }^2{\widehat{q}}_{+}=0.73\left(1\right)$, or $-1.37\left(6\right)$ 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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