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Fully quantum mechanical model of a SQUID ring coupled to an electromagnetic field

journal contribution
posted on 2023-06-07, 23:18 authored by M J Everitt, P Stiffell, T D Clark, A Vourdas, J F Ralph, H Prance, Robert Prance
A quantum system comprising of a monochromatic electromagnetic field coupled to a superconducting quantum interference device (SQUID) ring with sinusoidal nonlinearity is studied. A magnetostatic flux Fx is also threading the SQUID ring, and is used to control the coupling between the two systems. It is shown that for special values of Fx the system is strongly coupled. The time evolution of the system is studied. It is shown that exchange of energy takes place between the two modes and that the system becomes entangled. A second quasiclassical model that treats the electromagnetic field classically is also studied. A comparison between the fully quantum-mechanical model with the electromagnetic field initially in a coherent state and the quasiclassical model is made.

History

Publication status

  • Published

Journal

Physical Review B

ISSN

0163-1829

Issue

14

Volume

63

Page range

144530-1

Pages

7.0

Department affiliated with

  • Engineering and Design Publications

Notes

Reports the theory of a quantum mechanical SQUID coupled to electromagnetic fields. This system is of significant interest because of its applicability to quantum technologies. Paper is one of a series arising from close collaboration between theorists and experimentalists. It uses my experimental work as the justification for the theoretical model and the source of appropriate parameters for the numerical computation. The potential for application of quantum technologies is exciting interest from industry. As an example, I collaborate with HP Research Labs (Dr T. P. Spiller) and co-organised an EPSRC Network on Quantum Circuits with members from HEIs and industry.

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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