Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Nano- and Optomechanics

TT 45.2: Vortrag

Dienstag, 13. März 2018, 12:00–12:15, H 0110

Nano-electromechanics with High Impedance Superconducting Microwave Resonators and Aluminum Strings — •L. Rosenzweig^{1, 2}, D. Schwienbacher^{1, 2, 3}, P. Schmidt^{1, 2, 3}, M. Pernpeintner^{1, 2, 3}, C. Utschick^{1, 2}, R. Gross^{1, 2, 3}, and H. Huebl^{1, 2, 3} — ¹Walther-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.