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    Phys Rev Lett. 2000 Feb 28;84(9):1986-9.

    Double quantum dots as detectors of high-frequency quantum noise in mesoscopic conductors

    Source

    Department of Applied Physics and DIMES, Delft University of Technology, P.O. Box 5046, 2600 GA, Delft, The Netherlands and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA.

    Abstract

    We propose a measurement setup for detecting quantum noise over a wide frequency range using inelastic transitions in a tunable two-level system as a detector. The frequency-resolving detector consists of a double quantum dot which is capacitively coupled to the leads of a nearby mesoscopic conductor. The inelastic current through the double quantum dot is calculated in response to equilibrium and nonequilibrium current fluctuations in the nearby conductor, including zero-point fluctuations at very low temperatures. As a specific example, the fluctuations across a quantum point contact are discussed.

    PMID:
    11017677
    [PubMed - as supplied by publisher]

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