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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 110: Nano- and Optomechanics (joint session TT/CPP/HL)

CPP 110.1: Hauptvortrag

Freitag, 20. März 2020, 09:30–10:00, HSZ 03

Microwave Optomechanics with Superconducting Quantum Interference Cavities — •Daniel Bothner, Ines C. Rodrigues, and Gary A. Steele — Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600GA Delft, The Netherlands

Within the recent decade, cavity optomechanics has achieved tremendous breakthroughs regarding the detection and control of macroscopic mechanical oscillators with electromagnetic radiation. Among the most groundbreaking results are displacement sensing beyond the standard quantum limit, quantum ground-state sideband cooling and the generation of non-classical states of motion in massive mechanical objects. With most current approaches for optomechanical systems, however, the nonlinear single-photon regime seems still far out of reach.

Here, I will introduce a recently realized, novel approach for coupling microwave fields in a superconducting circuit to mechanical motion: flux-mediated microwave optomechanics. In this approach, mechanical motion is transduced to magnetic flux, which couples into a superconducting quantum interference device (SQUID). The SQUID forms the inductor of a superconducting microwave circuit and the coupling strength between the microwave circuit and the mechanical displacement is tunable and scales with the magnitude of the magnetic transduction field. Due to the linear scaling behavior, this flux-mediated approach has been predicted to have the realistic potential to reach the fully nonlinear regime of the optomechanical coupling, opening the door for the preparation of mechanical quantum states and a new generation of optomechanical devices.