Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.33: Poster

Wednesday, April 3, 2019, 15:00–18:30, Poster D

Nb SQUIDs for the detection of the motion of macroscopic mechanical oscillators — •K. Uhl¹, M. Rudolph¹, J. Hofer², J. Slater², M. Aspelmeyer², C. Schneider³, M. L. Juan³, D. Zoepfl³, G. Kirchmair³, O. F. Kieler⁴, T. Weimann⁴, R. Kleiner¹, and D. Koelle¹ — ¹Physikalisches Institut and Center for Quantum Science (CQ) in LISA⁺, Universität Tübingen, Germany — ²Vienna Center for Quantum Science and Technology, University of Vienna, Austria — ³Institute for Experimental Physics, University of Innsbruck, Austria — ⁴Fachbereich Quantenelektronik, Physikalisch-Technische Bundesanstalt (PTB) Braunschweig, Germany

Macroscopic mechanical oscillators can be used to investigate fundamental questions in macroscopic quantum physics and for quantum sensing applications. Such systems, however, suffer from decoherence effects, e.g. due to parasitic coupling to the environment or light absorption. Levitating solid-state objects, like a superconducting particle in a magnetic trap or a cantilever with a superconducting strip, offer a unique approach to the realization of nano- or even micro-sized quantum systems with potentially minimal decoherence. In combination with cryogenic temperatures, the coherence times in the quantum mechanical ground state can be increased significantly. To gain information on position and oscillatory behavior, a dc SQUID is employed. To optimize magnetic coupling between oscillator and SQUID, we performed numerical simulations based on London equations and evaluated various SQUID designs The results of the numerical simulations and experimentally determined SQUID performance will be presented.