Entanglement in the above-threshold optical parametric oscillator

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

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)

References in corpus (6)

• Quantum information with continuous variables
• Generation of Bright Two-Color Continuous Variable Entanglement
• Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables
• Experimental Demonstration of Quantum Entanglement Between Frequency-Nondegenerate Optical Twin Beams
• Experimental investigation of amplitude and phase quantum correlations in a type II OPO above threshold: from the non-degenerate to the degenerate operation
• Quantum analysis of the nondegenerate optical parametric oscillator with injected signal

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• Experimental demonstration of frequency-degenerate bright EPR beams with a self-phase-locked optical parametric oscillator
• Experimental observation of three-color optical quantum correlations
• Semiclassical Wigner distribution for two-mode entangled state
• Triply-resonant Optical Parametric Oscillator by Four-wave Mixing with Rubidium Vapor inside an Optical Cavity
• Experimental investigation to influence of pump phase fluctuation on phase-correlation of output optical fields from a non-degenerate parametric oscillator
• Critical fluctuations in an optical parametric oscillator: when light behaves like magnetism
• Evolution and entanglement of Gaussian states in the parametric amplifier
• Dependence of quantum correlations of twin beams on pump finesse of optical parametric oscillator
• Impact of anisotropy on the noncritical squeezing properties of two-transverse-mode optical parametric oscillators
• Cauchy-Schwarz characterization of tripartite quantum correlations in an optical parametric oscillator