Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Optomechanics II

Q 56.3: Vortrag

Donnerstag, 3. März 2016, 15:00–15:15, f342

Optomechanical multistability in the quantum regime — •Andreas Alvermann, Christian Schulz, and Holger Fehske — Institut für Physik, Universität Greifswald

Classical optomechanical systems feature self-sustained oscillations, where multiple stable periodic orbits at different amplitudes coexist. While these orbits persist in the quantum dynamics sufficiently close to the classical limit, a new dynamical pattern emerges as one moves deeper into the quantum regime: Transitions between different orbits are induced by the spreading of the quantum state in phase space, and the stability of orbits changes in a predictable way.

We explain the resulting dynamical patterns from the point of view of phase space dynamics, and derive a Langevin equation with a specific quantum noise term that comes into play only through the deviation of quantum states from classical states. We also discuss to which extent the transition to chaos observed in the classical dynamics survives in this context, and point out in which way the Langevin description is of general relevance for dissipative quantum systems in the vicinity of—but not arbitrarily close to—the classical limit.