title: Superconducting tetrahedral quantum bits.
abstract: We propose a design for a qubit with four superconducting islands in the topology of a symmetric tetrahedron, uniformly frustrated with one-half flux quantum per loop and one-half Cooper pair per island. This structure emulates a noise-resistant spin-1/2 system in a vanishing magnetic field. The flux frustration boosts quantum fluctuations and relieves the constraints on junction fabrication. Variability of manipulation and optimized readout are additional benefits of this design.
authors.affiliation: Landau Institute for Theoretical Physics, 117940 Moscow, Russia.
authors.forename: M V
authors.initials: MV
authors.lastname: Feigel'man
authors.forename: L B
authors.initials: LB
authors.lastname: Ioffe
authors.forename: V B
authors.initials: VB
authors.lastname: Geshkenbein
authors.forename: P
authors.initials: P
authors.lastname: Dayal
authors.forename: G
authors.initials: G
authors.lastname: Blatter