Controllable coupling of superconducting flux qubits

Details Controllable coupling of superconducting flux qubits Controllable coupling of superconducting flux qubits

2006-05-24

arxiv.org/abs/cond-mat/0605588v3

Phys. Rev. Lett. 98, 057004 (2007)

Physics

Condensed Matter

Superconductivity

REVTeX4, 4pp., 6 figs, 10 EPS figure files; N.B.: "Alec" is my first, and "Maassen van den Brink" my family name. v2: included

Scientific paper

10.1103/PhysRevLett.98.057004

We 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.

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