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Continuous quantum measurement with independent detector cross correlations

Jordan, Andrew N.
Published in Physical Review Letters. 2005, vol. 95, no. 220401, p. 4
Abstract We investigate the advantages of using two independent, linear detectors for continuous quantum measurement. For single-shot quantum measurement, the measurement is maximally efficient if the detectors are twins. For weak continuous measurement, cross-correlations allow a violation of the Korotkov-Averin bound for the detector's signal-to-noise ratio. A vanishing noise background provides a nontrivial test of ideal independent quantum detectors. We further investigate the correlations of non-commuting operators, and consider possible deviations from the independent detector model for mesoscopic conductors coupled by the screened Coulomb interaction.
Keywords Cross correlations
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JORDAN, Andrew N., BUTTIKER, Markus. Continuous quantum measurement with independent detector cross correlations. In: Physical Review Letters, 2005, vol. 95, n° 220401, p. 4. https://archive-ouverte.unige.ch/unige:4175

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Deposited on : 2009-11-30

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