title: Solid-state qubits with current-controlled coupling.
abstract: The ability to switch the coupling between quantum bits (qubits) on and off is essential for implementing many quantum-computing algorithms. We demonstrated such control with two flux qubits coupled together through their mutual inductances and through the dc superconducting quantum interference device (SQUID) that reads out their magnetic flux states. A bias current applied to the SQUID in the zero-voltage state induced a change in the dynamic inductance, reducing the coupling energy controllably to zero and reversing its sign.
authors.affiliation: Department of Physics, University of California, Berkeley, CA 94720-7300, USA.
authors.forename: T
authors.initials: T
authors.lastname: Hime
authors.forename: P A
authors.initials: PA
authors.lastname: Reichardt
authors.forename: B L T
authors.initials: BL
authors.lastname: Plourde
authors.forename: T L
authors.initials: TL
authors.lastname: Robertson
authors.forename: C-E
authors.initials: CE
authors.lastname: Wu
authors.forename: A V
authors.initials: AV
authors.lastname: Ustinov
authors.forename: John
authors.initials: J
authors.lastname: Clarke