Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 46: Open Quantum Systems II

Q 46.3: Vortrag

Donnerstag, 5. März 2026, 11:45–12:00, P 4

Towards an autonomous optomechanical Maxwell Demon engine — •Sander Stammbach und Stefan Nimmricher — Universität Siegen

We present a fully autonomous model for a mechanical Maxwell demon engine that converts heat absorbed by a qubit into population inversion of an attached quantum battery system. A damped mechanical oscillator acts as a pointer that incorporates the essential demon function of information acquisition about the qubit state and subsequent feedback into the system dynamics, replacing external measurements and control operations. This is achieved by means of the Holstein Hamiltonian, which makes the pointer*s equilibrium position depend on the qubit state and thereby leads to a state-dependent effective resonance shift. The mechanism enables a selective energy transfer to an attached spin system that acts as the quantum battery. We derive both local and global Lindblad master equations for the coupled system and identify the parameter regimes in which the engine operates efficiently. The figure of merit is the resulting steady-state population inversion of the battery, quantified in terms of ergotropy. Based on these results, we discuss the necessary conditions for practical implementations of the demon engine on realistic experimental platforms.

Keywords: Quantum Optics; Maxwell Demon; Heat engine; Ergotropy; Local vs Global Masterequattion