Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 9, Pages 1986-1989Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.1986
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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 detester 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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