Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.24: Poster

Wednesday, April 3, 2019, 15:00–18:30, Poster D

Driving optomechanics with quantum microwaves from inelastic Cooper pair tunneling — •Surangana Sengupta, Björn Kubala, Ciprian Padurariu, and Joachim Ankerhold — Institute for Complex Quantum Systems and IQST, Ulm University, 89069 Ulm, Germany

In cavity optomechanics the radiation-pressure forces of optical-light or microwave excitations of a resonator have been harnessed for a wide variety of purposes [1]: from cooling and the observation of quintessential quantum-mechanical effects, to archetypal nonlinear-dynamics phenomena, and the quantum-classical crossover between these regimes. On the other hand, inelastic Cooper-pair tunneling across a dc-biased junction can create diverse quantum states of microwave light in a cavity connected in series with the junction; owing to the inherent nonlinearity of the Josephson coupling [2].

Here, we theoretically investigate, how such states may be exploited to drive a mechanical degree of freedom to supplement or substitute classical or squeezed drives explored previously. Various possible coupling scenarios and first results of a semiclassical analysis will be discussed.

[1] Markus Aspelmeyer, Tobias J. Kippenberg, and Florian Marquardt, Rev. Mod. Phys. 86, 1391 (2014).

[2] M. Westig, B. Kubala, O. Parlavecchio, Y. Mukharsky, C. Altimiras, P. Joyez, D. Vion, P. Roche, M. Hofheinz, D. Esteve, M. Trif, P. Simon, J. Ankerhold, and F. Portier, Phys. Rev. Lett. 119, 137001 (2017).