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Scientific article
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English

Continuous quantum measurement with independent detector cross correlations

Published inPhysical review letters, vol. 95, no. 220401, 4
Publication date2005
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.

eng
Keywords
  • Cross correlations
Citation (ISO format)
JORDAN, Andrew N., BUTTIKER, Markus. Continuous quantum measurement with independent detector cross correlations. In: Physical review letters, 2005, vol. 95, n° 220401, p. 4. doi: 10.1103/PhysRevLett.95.220401
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Article (Published version)
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ISSN of the journal0031-9007
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