Mediated tunable coupling of flux qubits

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dc.creatorBrink, Alec Maassen van den
dc.creatorBerkley, A. J.
dc.creatorYalowsky, M.
dc.date2005-01-07
dc.date2005-10-13
dc.date.accessioned2026-07-07T06:37:26Z
dc.date.available2026-07-07T06:37:26Z
dc.descriptionIt is sketched how a monostable rf- or dc-SQUID can mediate an inductive coupling between two adjacent flux qubits. The nontrivial dependence of the SQUID's susceptibility on external flux makes it possible to continuously tune the induced coupling from antiferromagnetic (AF) to ferromagnetic (FM). In particular, for suitable parameters, the induced FM coupling can be sufficiently large to overcome any possible direct AF inductive coupling between the qubits. The main features follow from a classical analysis of the multi-qubit potential. A fully quantum treatment yields similar results, but with a modified expression for the SQUID susceptibility. Since the latter is exact, it can also be used to evaluate the susceptibility--or, equivalently, energy-level curvature--of an isolated rf-SQUID for larger shielding and at degenerate flux bias, i.e., a (bistable) qubit. The result is compared to the standard two-level (pseudospin) treatment of the anticrossing, and the ensuing conclusions are verified numerically.
dc.descriptionREVTeX 4, 16 pp., 4 EPS figures. N.B.: "Alec" is my first, and "Maassen van den Brink" my family name. v2: major expansion and rewriting, new title and co-author; to appear in New Journal of Physics special issue (R. Fazio, ed.)
dc.identifierhttps://arxiv.org/abs/cond-mat/0501148
dc.identifierhttp://arxiv.org/abs/cond-mat/0501148
dc.identifierNew J. Phys._7_, 230 (2005)
dc.identifierdoi:10.1088/1367-2630/7/1/230
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/100392
dc.subjectSuperconductivity
dc.subjectMesoscale and Nanoscale Physics
dc.titleMediated tunable coupling of flux qubits
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