Zel’dovich amplification in a superconducting circuit

Braidotti, M. C., Vinante, A., Gasbarri, G., Faccio, D. and Ulbricht, H. (2020) Zel’dovich amplification in a superconducting circuit. Physical Review Letters, 125(14), 140801. (doi: 10.1103/PhysRevLett.125.140801)

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Zel’dovich proposed that electromagnetic (EM) waves with angular momentum reflected from a rotating metallic, lossy cylinder will be amplified. However, we are still lacking a direct experimental EM-wave verification of this fifty-year old prediction due to the challenging conditions in which the phenomenon manifests itself: the mechanical rotation frequency of the cylinder must be comparable with the EM oscillation frequency. Here we propose an experimental approach that solves this issue and is predicted to lead to a measurable Zel’dovich amplication with existing superconducting circuit technology. We design a superconducting circuit with low frequency EM modes that couple through free-space to a magnetically levitated and spinning micro-sphere placed at the center of the circuit. We theoretically estimate the circuit EM mode gain and show that rotation of the micro-sphere can lead to experimentally observable amplification, thus paving the way for the first EM-field experimental demonstration of Zel’dovich amplification.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Braidotti, Miss Maria Chiara and Faccio, Professor Daniele
Authors: Braidotti, M. C., Vinante, A., Gasbarri, G., Faccio, D., and Ulbricht, H.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
Copyright Holders:Copyright © 2020 American Physical Society
First Published:First published in Physical Review Letters 125(14):140801
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
303021Black Hole Superradiance in Rotating Fluids (SURF)Daniele FaccioEngineering and Physical Sciences Research Council (EPSRC)EP/P006078/2P&S - Physics & Astronomy
303359PhoQusDaniele FaccioEuropean Commission (EC)820392P&S - Physics & Astronomy