title: Quantum superinductor with tunable nonlinearity.
abstract: We report on the realization of a superinductor, a dissipationless element whose microwave impedance greatly exceeds the resistance quantum R(Q). The design of the superinductor, implemented as a ladder of nanoscale Josephson junctions, enables tuning of the inductance and its nonlinearity by a weak magnetic field. The Rabi decay time of the superinductor-based qubit exceeds 1 μs. The high kinetic inductance and strong nonlinearity offer new types of functionality, including the development of qubits protected from both flux and charge noises, fault tolerant quantum computing, and high-impedance isolation for electrical current standards based on Bloch oscillations.
authors.affiliation: Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: M T
authors.initials: MT
authors.lastname: Bell
authors.forename: I A
authors.initials: IA
authors.lastname: Sadovskyy
authors.forename: L B
authors.initials: LB
authors.lastname: Ioffe
authors.forename: A Yu
authors.initials: AY
authors.lastname: Kitaev
authors.forename: M E
authors.initials: ME
authors.lastname: Gershenson