2001/03/23 by M. J. Everitt, P. B. Stiffell, T. D. Clark +5 · 2 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum, superfluid, helium dynamics #cond-mat.supr-con #quant-ph
paper · pdf · doi:10.1103/physrevb.63.144530
published as Phys. Rev. B 63, 144530 (2001) · 7 pages, 9 figures. Uploaded as implementing a policy of arXiving old papers
openalex publication_date 2001/03/23 · arxiv created 2004/11/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 \ensuremathΦx 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 \ensuremathΦx 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.