Double Quantum Dots as Detectors of High-Frequency Quantum Noise in Mesoscopic Conductors

Details Double Quantum Dots as Detectors of High-Frequency Quantum Noise in Mesoscopic Conductors Double Quantum Dots as Detectors of High-Frequency Quantum Noise in Mesoscopic Conductors

1999-05-19

arxiv.org/abs/cond-mat/9905283v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures. Final version to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.84.1986

We propose a measurement set-up 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 non-equilibrium current fluctuations in the nearby conductor, including vacuum fluctuations at very low temperatures. As a specific example, the fluctuations across a quantum point contact are discussed.

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