title: Tunable coupling of superconducting qubits.
abstract: We study an LC circuit implemented using a current-biased Josephson junction (CBJJ) as a tunable coupler for superconducting qubits. By modulating the bias current, the junction can be tuned in and out of resonance and entangled with the qubits coupled to it. One can thus implement two-qubit operations by mediating entanglement. We consider the examples of CBJJ and charge-phase qubits. A simple recoupling scheme leads to a generalization to arbitrary qubit designs.
authors.affiliation: Département de Physique and Centre de Recherche sur les Propriétés Electroniques de Matériaux Avancés, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Blais
authors.forename: Alexander Maassen
authors.initials: AM
authors.lastname: van den Brink
authors.forename: Alexandre M
authors.initials: AM
authors.lastname: Zagoskin