Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 19: Quantum dots and wires: Transport properties
HL 19.10: Vortrag
Dienstag, 13. März 2018, 12:00–12:15, A 151
Quantum stochastic resonance in driven single-electron tunneling — •Timo Wagner1, Johannes C. Bayer1, Eddy P. Rugeramigiabo1, Peter Hänggi2, and Rolf. J. Haug1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, Germany — 2Institut für Physik, Universität Augsburg, Germany
Ambient noise is generically considered to be harmful for an error-free signal detection. However, a certain level of noise can actually have a constructive influence and boost an otherwise subthreshold signal, known as stochastic resonance (SR) [1]. All reported SR systems thus far exhibit either thermal noise or need an additional external noise generator. For quantum systems, theory predicted that intrinsic quantum randomness may give rise to stochastic resonance as well [2,3]. Here, we experimentally evidence quantum stochatic resonance (QSR) in the periodically driven charging of single-electrons in a quantum dot. By extracting the counting statistics [4,5], we demonstrate that the synchronization of the tunneling events with the periodic driving runs across an optimum, no matter whether the external frequency or the internal shot-noise level are tuned. The tunneling events were temporally resolved, using single-electron charge detection [5,6].
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