Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.56: Poster
Montag, 17. März 2025, 15:00–18:00, P4
Towards SQUID Optomechanical Devices based on YBa2Cu3O7 — •Timo Märklin, Kenny Fohmann, Michael Schöllhorn, Mohamad El Kazouini, Christoph Schmid, Benedikt Wilde, Dieter Koelle, Reinhold Kleiner, and Daniel Bothner — Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Universität Tübingen, Germany
Integrating a superconducting quantum interference device (SQUID) into a superconducting microwave resonator yields a circuit with a flux-tunable resonance frequency. By additionally releasing a part of the SQUID loop from the substrate such that it can oscillate mechanically, one obtains a SQUID optomechanical device in which microwave photons interact with phonons of the mechanical oscillator. If their interaction rate is sufficiently high, one can prepare non-classical states in the mechanical resonator which could build the foundation for experiments testing quantum gravity.
Today’s standard material for superconducting frequency-tunable resonators is aluminum. However, the low critical field of aluminum in the range of some 10 mT severely limits the interaction rates achievable in SQUID optomechanical devices, as the interaction rate is directly proportional to an externally applied magnetic field. Therefore, we investigate the high-Tc superconductor YBa2Cu3O7 (YBCO) regarding its suitability for SQUID optomechanics, since its high critical field beyond 10 T promises interaction rates higher than those achieved so far. This poster presents our recent progress along the path towards SQUID optomechanical devices based on YBCO.
Keywords: Microwave resonators; SQUIDs; YBCO; Optomechanics; Micromechanical resonators