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Theory of quantum noise detectors based on resonant tunneling

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Published in Physical Review. B, Condensed Matter. 2008, vol. 78, no. 3
Abstract We propose to use the phenomenon of resonant tunneling for the detection of noise. The main idea of this method relies on the effect of homogeneous broadening of the resonant tunneling peak induced by the emission and absorption of collective charge excitations in the measurement circuit. In thermal equilibrium, the signal-to-noise ratio of the detector as a function of the detector bandwidth (the detector function) is given by the universal hyperbolic tangent, which is the statement of the fluctuation-dissipation theorem. The universality breaks down if nonequilibrium processes take place in the measurement circuit. We propose a theory of this phenomenon and make predictions for the detector function in the case when nonequilibrium noise is created by a mesoscopic conductor. We investigate measurement circuit effects and prove the universality of the classical noise detection. Finally, we evaluate the contribution of the third cumulant of current and make suggestions of how it can be measured.
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SUKHORUKOV, Eugene, EDWARDS, Jonathan. Theory of quantum noise detectors based on resonant tunneling. In: Physical Review. B, Condensed Matter, 2008, vol. 78, n° 3. https://archive-ouverte.unige.ch/unige:36333

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Deposited on : 2014-05-05

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