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TT: Fachverband Tiefe Temperaturen

TT 59: Transport: Poster

TT 59.4: Poster

Mittwoch, 20. März 2024, 15:00–18:00, Poster E

Towards single-photon optomechanics using superconducting quantum interference — •Mohamad El Kazouini, Benedikt Wilde, Timo Kern, Christoph Füger, Kevin Uhl, Dieter Koelle, Reinhold Kleiner, and Daniel Bothner — Physikalisches Institut, Center for Quantum Science (CQ) and LISA$^{+}$, Universität Tübingen, Germany

Cavity optomechanics explores the coupling between mechanical oscillators and electromagnetic modes through radiation-pressure. Various milestone experiments have been reported, such as groundstate cooling or non-classical mechanical states preparation. All experiments so far, however, utilize only the first-order interaction in the linearized regime, mainly due to small single-quantum coupling rates. Increasing the single-photon coupling rates would not only unlock the optomechanical single-photon regime, but also grant access to higher-order terms of the interaction, enabling for instance mechanical cat-state preparation. Flux-mediated optomechanics (FMOM) is a strong candidate for achieving this groundbreaking regime. In FMOM, the mechanical oscillator is a microbeam integrated into a superconducting quantum interference device (SQUID), which is part of a microwave LC circuit. The single-quantum coupling rates in FMOM are proportional to an external magnetic field, but all FMOM implementations so far are based on Al, that has low magnetic-field-tolerance. Implementing it with high-field-compatible superconducting circuits is therefore the main challenge for maximized coupling rates. On our poster, we will present our progress in developing niobium-based FMOM devices.

Keywords: Quantum physics; SQUID optomechanics; Microwave circuits