Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 42: Nano- and Optomechanics

TT 42.4: Talk

Wednesday, April 3, 2019, 11:30–11:45, H7

Nano-strings in circuit QED — •Philip Schmidt^{1, 2, 3}, Daniel Schwienbacher^{1, 2, 3}, Natalie Segercrantz¹, Mohammad T. Amawi^{1, 2}, Christoph Utschick^{1, 2}, Matthias Pernpeintner^{1, 2, 3}, Rudolf Gross^{1, 2, 3}, and Hans Huebl^{1, 2, 3} — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Physik-Departement, Technische Universität München, Garching, Germany — ³Nanosystems Initiative Munich, München, Germany

In nano-electromechanics, quantum mechanical phenomena can be studied in the literal sense. For example, the coupling of a nanomechanical element to a superconducting resonator allows to cool the mechanical mode to its ground state and to squeeze its motion. Replacing the linear microwave resonator with a nonlinear one enables the preparation of more complex non-classical mechanical states.

Here, we discuss such a realization, based on Josephson junctions in superconducting circuit environments. In particular, we envisage the scenario of a mechanically compliant tensile-strained nanostring embedded into a microwave resonator combined with Josephson junctions circuits. We present experimental data of such ciruits and critically highlight limitations imposed by the embeded Jospheson junctions regarding the device performance.

Such hybrid systems open new perspectives in the field of optomechanics ranging from sensing applications to the use of quantum states.