title: Toroidal qubits: naturally-decoupled quiet artificial atoms.
abstract: The requirements of quantum computations impose high demands on the level of qubit protection from perturbations; in particular, from those produced by the environment. Here we propose a superconducting flux qubit design that is naturally protected from ambient noise. This decoupling is due to the qubit interacting with the electromagnetic field only through its toroidal moment, which provides an unusual qubit-field interaction, which is suppressed at low frequencies.
authors.affiliation: Physics Department, Loughborough University, Loughborough LE11 3TU, United Kingdom.|iTHES Research Group, RIKEN, Saitama 351-0198, Japan.|Theoretical Physics and Quantum Technologies Department, Moscow Institute for Steel and Alloys, 119049 Moscow, Russia.
authors.forename: Alexandre M
authors.initials: AM
authors.lastname: Zagoskin
authors.affiliation: Technische Universität Darmstadt, Institut für Mikrowellentechnik und Photonik, Merckstr. 25, 64283 Darmstadt, Germany.
authors.forename: Arkadi
authors.initials: A
authors.lastname: Chipouline
authors.affiliation: Leibniz Institute of Photonic Technology, P.O. Box 100239, D-07702 Jena, Germany.
authors.forename: Evgeni
authors.initials: E
authors.lastname: Il'ichev
authors.affiliation: iTHES Research Group, RIKEN, Saitama 351-0198, Japan.
authors.forename: J Robert
authors.initials: JR
authors.lastname: Johansson
authors.affiliation: Center for Emergent Matter Science, RIKEN, Saitama 351-0198, Japan.|Physics Department, The University of Michigan, Ann Arbor, Michigan, 48109-1040, USA.
authors.forename: Franco
authors.initials: F
authors.lastname: Nori