Superconductor-ferromagnet junction phase qubit

Abstract

We propose a scheme for a phase qubit in an SIFIS junction, consisting of bulk superconductors (S), a proximity-induced ferromagnet (F), and insulating barriers (I). The qubit state is constituted by 0 and $\pi$ phase states of the junction, in which the charging energy of the junction leads to the superposition of the two states. The qubit is operated by the gate voltage applied to the ferromagnet, and insensitive to the decoherence sources existing in other superconducting qubits. We discuss a scalable scheme for qubit measurement and tunable two-qubit coupling.

3 pages, 3 figures

References in corpus (13)

• Bipolar supercurrent in graphene
• Quantum oscillations in two coupled charge qubits
• Two-level systems driven by large-amplitude fields
• Half-integer Shapiro steps at the 0-pi crossover of a ferromagnetic Josephson junction
• Superconducting pi qubit with a ferromagnetic Josephson junction
• Tunable effective g-factor in InAs nanowire quantum dots
• Spontaneous supercurrent induced by ferromagnetic pi-junctions
• Josephson effect in double-barrier superconductor-ferromagnet junctions
• A supercurrent switch in graphene $\pi$-junctions
• Superconducting pi qubit with three Josephson junctions
• sin(2 phi) current-phase relation in SFS junctions with decoherence in the ferromagnet
• Controllable Coupling in Phase-Coupled Flux Qubits
• $\pi$-junction qubit in monolayer graphene