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Pinch resonances in a radio-frequency driven SQUID ring-resonator system

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posted on 2023-06-08, 09:10 authored by H Prance, T D Clark, R Whiteman, Robert Prance, M Everitt, P Stiffell, J F Ralph
In this paper we present experimental data on the frequency domain response of a SQUID ring (a Josephson weak link enclosed by a thick superconducting ring) coupled to a radio frequency (rf) tank circuit resonator. We show that with the ring weakly hysteretic the resonance lineshape of this coupled system can display opposed fold bifurcations that appear to touch (pinch off). We demonstrate that for appropriate circuit parameters these pinch off lineshapes exist as solutions of the non-linear equations of motion for the system.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review E

ISSN

1063-651X

Issue

1

Volume

64

Page range

016208-1

Pages

8.0

Department affiliated with

  • Engineering and Design Publications

Notes

This paper reports results of my experimental work which, over a number of years, has been concerned with nonlinear and macroscopic quantum effects in RF SQUIDs, including under my EPSRC New Lecturer Grant GR/N32266/01. These devices have long been of interest both as ultra-sensitive magnetometers and, latterly, as potential candidates for quantum technologies. Their extreme non-linearity presents both advantages and difficulties in these applications and a clear understanding of the behaviour is vital for design and exploitation of the devices. This work contributed to a successful application for £200k SRIF funding of an ultra-low temperature facility at Sussex.

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

First Open Access (FOA) Date

2015-06-24

First Compliant Deposit (FCD) Date

2015-06-24

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