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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.
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.
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