Three-tone coherent microwave electromechanical measurement of a superfluid Helmholtz resonator

Journal article (2023)

Authors

S. Spence University of Alberta
E. Varga Charles University
C.A. Potts QN/Steele Lab - AS , Kavli institute of nanoscience Delft
J. P. Davis University of Alberta
Research Group
QN/Steele Lab (AS) (TU Delft)
Copyright: © 2023 S. Spence, E. Varga, C.A. Potts, J. P. Davis
DOI: https://doi.org/10.1063/5.0165488
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Published Date

2023

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Steele Lab

Abstract

We demonstrate electromechanical coupling between a superfluid mechanical mode and a microwave mode formed by a patterned microfluidic chip and a 3D cavity. The electric field of the chip-cavity microwave resonator can be used to both drive and detect the motion of a pure superflow Helmholtz mode, which is dictated by geometric confinement. The coupling is characterized using a coherent measurement technique developed for measuring weak couplings deep in the sideband unresolved regime. The technique is based on two-probe optomechanically induced transparency/amplification using amplitude modulation. Instead of measuring two probe tones separately, they are interfered to retain only a signal coherent with the mechanical motion. With this method, we measure a vacuum electromechanical coupling strength of g 0 = 2 p × 23.3 µ Hz, three orders of magnitude larger than previous superfluid electromechanical experiments.