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Conditional preparation of a quantum state in the continuous variable regime: generation of a sub-Poissonian state from twin beams
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Conditional preparation of a quantum state in the continuous variable regime: generation of a sub-Poissonian state from twin beams
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We report the first experimental demonstration of conditional preparation of a non classical state of light in the continuous variable regime. Starting from a non degenerate OPO which generates above threshold quantum intensity correlated signal and idler "twin beams", we keep the recorded values of the signal intensity only when the idler falls inside a band of values narrower than its standard deviation. By this very simple technique, we generate a sub-Poissonian state 4.4dB below shot noise from twin beams exhibiting 7.5dB of noise reduction in the intensity difference.
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