Three-Tone Coherent Microwave Electromechanical Measurement of a Superfluid Helmholtz Resonator

• URL: http://arxiv.org/abs/2307.01250v1
• Date: Mon, 3 Jul 2023 18:00:00 GMT
• Title: Three-Tone Coherent Microwave Electromechanical Measurement of a Superfluid Helmholtz Resonator
• Authors: Sebastian Spence (1), Emil Varga (2), Clinton A. Potts (3), John P. Davis (1) ((1) Department of Physics, University of Alberta, (2) Faculty of Mathematics and Physics, Charles University, (3) Kavli Institute of NanoScience, Delft University of Technology)
• Abstract summary: 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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 $g_0 = 2\pi \times 23.3$ $\mathrm{\mu}$Hz, three orders of magnitude larger than previous superfluid electromechanical experiments.

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