@unpublished{Bednorz2012Nonsy-22475,
  year={2012},
  title={Nonsymmetrized Correlations in Quantum Noninvasive Measurements},
  author={Bednorz, Adam and Bruder, Christoph and Reulet, Bertrand and Belzig, Wolfgang}
}

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    <dc:creator>Reulet, Bertrand</dc:creator>
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    <dc:contributor>Belzig, Wolfgang</dc:contributor>
    <dc:creator>Belzig, Wolfgang</dc:creator>
    <dcterms:abstract xml:lang="eng">A long-standing problem in quantum mesoscopic physics is how to order operators in quantum noise expressions like &lt;I(-\omega)I(\omega)&gt; where I(\omega) is the measured current at frequency \omega. Symmetrized ordering of operators describes a classical measurement while nonsymmetrized ordering corresponds to a quantum detector, sensitive to either emission or absorption of photons. We show that both ordering schemes can be embedded in quantum weak-measurement theory taking into account a finite interaction time between the system and the detector. Importantly, the nonsymmetrized ordering reveals its nonclassical nature already in second-order correlations, contrary to symmetrized ordering. This feature can be related to the squeezing of the many-body state of the transported electrons in a ac-driven tunnel junction.</dcterms:abstract>
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    <dc:creator>Bruder, Christoph</dc:creator>
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