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

Everitt, M J, Stiffell, P, Clark, T D, Vourdas, A, Ralph, J F, Prance, H and Prance, R J (2001) Fully quantum mechanical model of a SQUID ring coupled to an electromagnetic field. Physical Review B, 63 (14). pp. 144530-1. ISSN 0163-1829

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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.

Item Type: Article
Additional Information: 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.
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Peter Stiffell
Date Deposited: 06 Feb 2012 19:32
Last Modified: 24 Jun 2015 12:22
URI: http://sro.sussex.ac.uk/id/eprint/21154
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