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DY: Fachverband Dynamik und Statistische Physik

DY 9: Statistical Physics far from Thermal Equilibrium

DY 9.1: Talk

Monday, March 12, 2018, 10:00–10:15, BH-N 334

An electronic Maxwell demon in the coherent strong-coupling regime — •Gernot Schaller1, Javier Cerrillo1, Geort Engelhardt1, and Philipp Strasberg21Institut für Theoretische Physik, TU Berlin — 2Physics and Materials Science Research Unit, Uni Luxembourg

We consider feedback control on a single electron transistor. Monitoring the occupation of the dot, conditional control operations can be interpreted as the action of a Maxwell demon. This can generate a current against a potential bias, producing electric power from information. While this is well-explored in the weak-coupling limit and has recently been implemented [1], we can address the strong-coupling regime with a collective mapping [2]. A continuous projective measurement of the central dot would lead to a complete suppression of electronic transport due to the quantum Zeno effect [3]. However, a microscopic model implements a weak measurement, which allows for closure of the control loop without inducing complete transport blockade [4]. In the weak-coupling regime, the energy flows associated with the feedback loop are negligible, and the information gained in the measurement bounds the generated electric power. In contrast, in the strong coupling limit, the protocol requires more energy than electric power produced, removing Maxwell’s demon.

[1] K. Chida et al., Nat. Comm. 8, 15310 (2017).

[2] P. Strasberg et al., arXiv:1711.08914.

[3] G. Engelhardt and G. Schaller, arXiv:1710.06306.

[4] G. Schaller et al., arXiv:1711.00706.

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