Controllable coupling of superconducting flux qubits

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dc.creatorvan der Ploeg, S. H. W.
dc.creatorIzmalkov, A.
dc.creatorBrink, Alec Maassen van den
dc.creatorHuebner, U.
dc.creatorGrajcar, M.
dc.creatorIl'ichev, E.
dc.creatorMeyer, H. -G.
dc.creatorZagoskin, A. M.
dc.date2006-05-24
dc.date2007-05-23
dc.date.accessioned2026-07-07T08:05:31Z
dc.date.available2026-07-07T08:05:31Z
dc.descriptionWe have realized controllable coupling between two three-junction flux qubits by inserting an additional coupler loop between them, containing three Josephson junctions. Two of these are shared with the qubit loops, providing strong qubit--coupler interaction. The third junction gives the coupler a nontrivial current--flux relation; its derivative (i.e., the susceptibility) determines the coupling strength J, which thus is tunable in situ via the coupler's flux bias. In the qubit regime, J was varied from ~45 (antiferromagnetic) to ~ -55 mK (ferromagnetic); in particular, J vanishes for an intermediate coupler bias. Measurements on a second sample illuminate the relation between two-qubit tunable coupling and three-qubit behavior.
dc.descriptionREVTeX4, 4pp., 6 figs, 10 EPS figure files; N.B.: "Alec" is my first, and "Maassen van den Brink" my family name. v2: included discussion of a 2nd sample with sign-tunability v3:rewritten for publication
dc.identifierhttps://arxiv.org/abs/cond-mat/0605588
dc.identifierhttp://arxiv.org/abs/cond-mat/0605588
dc.identifierPhys. Rev. Lett. 98, 057004 (2007)
dc.identifierdoi:10.1103/PhysRevLett.98.057004
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/130307
dc.subjectSuperconductivity
dc.subjectQuantum Physics
dc.titleControllable coupling of superconducting flux qubits
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