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DY: Dynamik und Statistische Physik

DY 11: Allgemeine Statistische Physik I

DY 11.3: Vortrag

Montag, 22. März 1999, 10:00–10:15, R1

Aperiodic Quantum Stochastic Resonance — •Igor Goychuk and Peter Hänggi — Universität Augsburg, Institut für Physik, Universitätsstrasse 1, 86135 Augsburg, Germany

We investigate aperiodic quantum stochastic resonance (QSR) in a two-level system (TLS) coupled to an Ohmic heat bath. The input-output mutual information is used as a measure to quantify aperiodic QSR. For a symmetric TLS it is shown in the lowest order of the rms amplitude of the signal that the maximum rate of information transmission is determined by the conventional signal-to-noise ratio (SNR). Thus, aperiodic QSR in the information capacity of TLS occurs whenever the conventional QSR takes place. For a symmetric TLS with Ohmic dissipation this happens when the frictional strength ‶α″ exceeds a critical value α_c=3/2. We argue that such thermal noise induced gain in the input-output mutual information is not due to an input-output synchronization. Alternatively, we characterize the aperiodic QSR by input-output cross-correlations. In contrast to the mutual information, the cross-correlation coefficient provides a synchronization measure.