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TT: Fachverband Tiefe Temperaturen

TT 5: Poster Session: Superconductivity

TT 5.26: Poster

Montag, 27. September 2021, 13:30–16:00, P

Josephson Optomechanics — •Surangana Sen Gupta¹, Björn Kubala^1,2, Ciprian Padurariu¹, and Joachim Ankerhold¹ — ¹ICQ and IQST, Ulm University, Germany — ²Institute of Quantum Technologies, German Aerospace Center (DLR), Ulm, Germany

Optomechanics at optical frequencies typically uses sources of light in a classical state, e.g. coherent states from lasers, to control mechanical vibrations. Cavity optomechanics can also be realised in the microwave regime using superconducting cavities and Josephson junctions. Inelastic tunneling in a Josephson junction biased by a dc-voltage can provide a bright source of quantum states of light, that can then be used for optomechanics. Experiments [1] have shown that the nonlinearity of Josephson junctions allows for various photon creation processes including single photon and multi-photon resonances.
Here, we theoretically investigate an optomechanical system consisting of a single-mode superconducting cavity, which is parametrically driven by a dc-biased Josephson junction at the two-photon resonance, and a mechanical resonator. The optomechanical coupling is treated in the spirit of mean field where the cavity is deep in the quantum regime, while the mechanics is considered semi-classical. We show that squeezed microwaves lead to regimes of heating and cooling for the mechanics and identify their signatures in the spectrum. We contrast these signatures with those of conventional optomechanics.
[1] M. Hofheinz, F. Portier, Q. Baudouin, P. Joyez, D. Vion, P. Bertet, P. Roche, D. Esteve, Phys. Rev. Lett. 106, 217005 (2011)