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Narrowband frequency tunable light source of continuous quadrature entanglement

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arxiv quant-ph/0205015 v2 pith:V62X63ML submitted 2002-05-03 quant-ph

Narrowband frequency tunable light source of continuous quadrature entanglement

Christian Schori , Jens L. S{\o}rensen , Eugene S. Polzik (QUANTOP - Danish National Research Foundation Centre for Quantum Optics , Institute of Physics , Astronomy , University of Aarhus) This is my paper
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keywords sourceatomiccontinuousentanglementfrequencylightnarrowbandoscillator
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We report the observation of non-classical quantum correlations of continuous light variables from a novel type of source. It is a frequency non-degenerate optical parametric oscillator below threshold, where signal and idler fields are separated by 740MHz corresponding to two free spectrum ranges of the parametric oscillator cavity. The degree of entanglement observed, - 3.8 dB, is the highest to-date for a narrowband tunable source suitable for atomic quantum memory and other applications in atomic physics. Finally we use the latter to visualize the Einstein-Podolsky-Rosen paradox.

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