Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 32: Transport: Nanomechanics and Optomechanics (jointly with CPP, DY, BP, DF)
TT 32.2: Talk
Tuesday, March 21, 2017, 14:15–14:30, HSZ 201
Transmon qubits meet cavity electromechanics — •P. Schmidt1,2,3, D. Schwienbacher1,2,3, M. Pernpeintner1,2,3, F. Wulschner1,2,3, F. Deppe1,2,3, A. Marx1,2, R. Gross1,2,3, and H. Huebl1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Germany — 2Physik-Department, TUM, Germany — 3Nanosystems Initiative Munich, Germany
In cavity electromechanics, quantum mechanical phenomena can be studied in the literal sense. For the preparation of mechanical (phonon) Fock states, the integration of a sufficiently nonlinear circuit element is of key importance. Here, we present a hybrid system consisting of a superconducting coplanar microwave resonator coupled to a nano-mechanical beam and a transmon qubit acting as nonlinear circuit element. In this way circuit QED is combined with the world of circuit electronanomechanics. We show continuous wave spectroscopy data for the transmon qubit as well as the nano-mechanical beam. The ac-Stark shift of the transmon qubit as well as electromechanically induced absorption measurements allow us to determine the microwave photon number in the microwave resonator for two opposite power regimes, differing by ten orders of magnitude. In both regimes we find qualitatively the same dependence of the photon number on the power applied to the microwave resonator. Our experiments demonstrate the successful combination of circuit QED and nanomechanics.