Effective Universal Liouvillian for the Parametric Instability at Threshold

Datum

14.06.2023

Zeit

10:00 - 11:00

Sprecher

Prof. Dr. Fabian Hassler

Zugehörigkeit

RWTH Aachen, JARA Institut für Quanteninformation

Sprache

en

Hauptthema

Materialien

Host

Grit Rötzer

Beschreibung

We study the effect of quantum fluctuations on the parametric instability of a degenerate parametric oscillator at threshold. Relying on a weak nonlinearity, we identify an (effective) universal Liouvillian consistent with the symmetries of the system that captures the slow (long-time) dynamics. We find that all cumulants exhibit universal power-law scaling with the nonlinearity, with the Fano factor showing a maximum near the threshold. For a voltage biased Josephson junction, the method of third quantization method is used to identify the slow modes and to derive the effective dynamics by adiabatic elimination of the fast modes. In this way, the parameters entering the effective model can be linked to the microscopic parameters of the experimental platform. Our findings offer insights into the oscillator's behavior and provide a foundation for understanding and predicting the parametric instability at threshold. .

Links

• Seminars at the IFW

Letztmalig verändert: 13.06.2023, 07:39:30