Quantum Superinductor with Tunable Non-Linearity

Abstract

We report on the realization of a superinductor, a dissipationless element whose microwave impedance greatly exceeds the resistance quantum. 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 microsecond. 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.

text 4 pages, supplementary materials 6 pages

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• Progress in Superconducting Metamaterials
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• Superconducting Quantum Simulator for Topological Order and the Toric Code
• Magnetic field resilient high kinetic inductance superconducting niobium nitride coplanar waveguide resonators
• Coupling Two Spin Qubits with a High-Impedance Resonator
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• Quantum non-demolition dispersive readout of a superconducting artificial atom using large photon numbers
• Spectroscopic Evidence of the Aharonov-Casher effect in a Cooper Pair Box
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• Granular Aluminum Meandered Superinductors for Quantum Circuits
• Bloch band dynamics of a Josephson junction in an inductive environment
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• Ultrastrong coupling dynamics with a transmon qubit
• Control and Coherence Time Enhancement of the 0-$\pi$ Qubit
• Geometric Scaling of Two-Level-System Loss in Superconducting Resonators
• Josephson-Kondo screening cloud in circuit quantum electrodynamics
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• Josephson junction microwave modulators for qubit control
• Flux-charge duality and topological quantum phase fluctuations in quasi-one-dimensional superconductors
• Josephson Metamaterial with a widely tunable positive/negative Kerr constant
• Geometric superinductance qubits: Controlling phase delocalization across a single Josephson junction
• Consistent Quantization of Nearly Singular Superconducting Circuits
• Collective modes in the fluxonium qubit
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• Symmetries and collective excitations in large superconducting circuits
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• Spontaneous emission of Schrödinger cats in a waveguide at ultrastrong coupling
• Multi-mode architectures for noise-resilient superconducting qubits
• Design of an on-chip superconducting microwave circulator with octave bandwidth
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• Disordered Josephson junction chains: Anderson localization of normal modes and impedance fluctuations
• Wigner negativity in the steady-state output of a Kerr parametric oscillator
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• Superconductor-insulator transition in Josephson junction chains by quantum Monte-Carlo
• Quantum bath engineering of a high impedance microwave mode through quasiparticle tunneling
• Phase-sticking in one-dimensional Josephson Junction Chains
• Dual Shapiro steps of a phase-slip junction in the presence of a parasitic capacitance
• Tunable ohmic environment using Josephson junction chains
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• Josephson Ladders as a Model System for 1D Quantum Phase Transitions
• Coherent dynamics in long fluxonium qubits
• Dynamics of a Qubit in a High-Impedance Transmission Line from a Bath Perspective
• Gatemonium: A Voltage-Tunable Fluxonium
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• Tradeoff between Leakage and Dephasing Errors in the Fluxonium Qubit
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• Demonstration of high-impedance superconducting NbRe Dayem bridges
• Effects of Strong Capacitive Coupling Between Meta-Atoms in rf SQUID Metamaterials
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• Scanning tunneling spectroscopy of superconducting nitridized aluminum thin films