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Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 45: Nano- and Optomechanics

TT 45.2: Talk

Tuesday, March 13, 2018, 12:00–12:15, H 0110

Nano-electromechanics with High Impedance Superconducting Microwave Resonators and Aluminum Strings — •L. Rosenzweig1, 2, D. Schwienbacher1, 2, 3, P. Schmidt1, 2, 3, M. Pernpeintner1, 2, 3, C. Utschick1, 2, R. Gross1, 2, 3, and H. Huebl1, 2, 31Walther-Meißner-Insitut, Garching, Germany — 2Physik-Departement, Technische Universität München, Garching, Germany — 3Nanosystems Initiative Munich, München, Germany

In optomechanics the interaction of light with a tailored phononic state is studied. Replacing optical cavities by superconducting microwave resonators defines the subfield of nano-electromechanics. These circuits benefit from high-Q microwave resonators and nanometer-sized mechanical resonators. A key challenge is the realization of a large electromechanical coupling exceeding the damping rate of the microwave cavity.

We present a hybrid system consisting of a high impedance superconducting microwave and a mechanical string resonator. Using finite element modeling, we discuss how the capacative electromechanical coupling rate (g0) scales with the system geometry and how high impedance resonators allow to enhance g0 compared to 50 Ω resonators. We show experimental data and compare the results to simulations. Moreover, high impedance resonators are compatible with superconducting qubits and provide hereby a pathway towards the preparation of quantum states in mechnical resonators.

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