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TT: Fachverband Tiefe Temperaturen
TT 50: Superconducting Electronics: SQUIDs, Qubits, Circuit QED II
TT 50.12: Vortrag
Donnerstag, 20. März 2025, 18:00–18:15, H36
Observation and Modelling of Self-Sustained Oscillations in Non-Linear Cavity-Optomechanics — •Korbinian Rubenbauer1,2, Shivangi Dhiman4, Thomas Luschmann1,2, Achim Marx1,2, Rudolf Gross1,2,3, Anja Metelmann4,5, and Hans Huebl1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2School of Natural Sciences, Technical University of Munich, Garching, Germany — 3Munich Center for Quantum Science and Technology, Munich, Germany — 4Institute for Theory of Condensed Matter and Institute for Quantum Materials and Technology, Karlsruhe Institute of Technology, Karlsruhe, Germany — 5Institut de Science et d'Ingénierie Supramoléculaires, University of Strasbourg and CNRS
Quantum sensing uses quantum elements or quantum principles to detect an external stimulus. In this context, cavity-electromechanics focuses on mechanical sensor elements dispersively coupled to a microwave resonator. This setting typically uses linear mechanical elements and linear microwave cavities. Here, we discuss the case of a non-linear or Kerr microwave resonator as a readout circuit. Our device integrates a mechanically compliant nanostring into a superconducting quantum interference device (SQUID), which is part of a flux-tunable superconducting resonator. This enables large tunable single-photon optomechanical coupling. We present an experimental and theoretical study investigating the impact of the Kerr nonlinearity on the device performance, particularly in the context of mechanical instabilities. We find excellent quantitative agreement.
Keywords: Optomechanics; Nanoelectromechanics; Nano-Electromechanics; Self-Sustained Osciallations; Non-Linear Modelling