A gate-tunable, field-compatible fluxonium

Abstract

Circuit quantum electrodynamics, where photons are coherently coupled to artificial atoms built with superconducting circuits, has enabled the investigation and control of macroscopic quantum-mechanical phenomena in superconductors. Recently, hybrid circuits incorporating semiconducting nanowires and other electrostatically-gateable elements have provided new insights into mesoscopic superconductivity. Extending the capabilities of hybrid flux-based circuits to work in magnetic fields would be especially useful both as a probe of spin-polarized Andreev bound states and as a possible platform for topological qubits. The fluxonium is particularly suitable as a readout circuit for topological qubits due to its unique persistent-current based eigenstates. In this Letter, we present a magnetic-field compatible hybrid fluxonium with an electrostatically-tuned semiconducting nanowire as its non-linear element. We operate the fluxonium in magnetic fields up to 1T and use it to observe the ${\phi }_0$-Josephson effect. This combination of gate-tunability and field-compatibility opens avenues for the exploration and control of spin-polarized phenomena using superconducting circuits and enables the use of the fluxonium as a readout device for topological qubits.

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Cited by in corpus (39)

• A Josephson phase battery
• Singlet-doublet transitions of a quantum dot Josephson junction detected in a transmon circuit
• Gralmonium: Granular Aluminum Nano-Junction Fluxonium Qubit
• Quasiparticles in superconducting qubits with asymmetric junctions
• Gate-tunable, superconductor-semiconductor parametric amplifier
• Strong tunable coupling between two distant superconducting spin qubits
• Demonstration of nonlocal Josephson effect in Andreev molecules
• Magnetic-Field-Compatible Superconducting Transmon Qubit
• Magnetic-field resilience of 3D transmons with thin-film Al/AlO${}_x$/Al Josephson junctions approaching 1 T
• Dynamical polarization of the fermion parity in a nanowire Josephson junction
• Magnifying quantum phase fluctuations with Cooper-pair pairing
• Mitigation of quasiparticle loss in superconducting qubits by phonon scattering
• Measurements of Phase Dynamics in Planar Josephson Junctions and SQUIDs
• Microwave spectroscopy of interacting Andreev spins
• Operating in a deep underground facility improves the locking of gradiometric fluxonium qubits at the sweet spots
• Evidence of Andreev blockade in a double quantum dot coupled to a superconductor
• Nonlinearity and Parametric Amplification of Superconducting Nanowire Resonators in Magnetic Field
• Flip-chip-based microwave spectroscopy of Andreev bound states in a planar Josephson junction
• Direct microwave spectroscopy of Andreev bound states in planar Ge Josephson junctions
• Strong Charge-Photon Coupling in Planar Germanium Enabled by Granular Aluminium Superinductors
• Evidence of $\varphi$0-Josephson junction from skewed diffraction patterns in Sn-InSb nanowires
• Gatemonium: A Voltage-Tunable Fluxonium
• Ultrahigh-inductance materials from spinodal decomposition
• The carbon nanotube gatemon qubit
• Microwave-activated gates between a fluxonium and a transmon qubit
• Gate-Compatible Circuit Quantum Electrodynamics in a Three-Dimensional Cavity Architecture
• Microwave-induced conductance replicas in hybrid Josephson junctions without Floquet-Andreev states
• Spin Environment of a Superconducting Qubit in High Magnetic Fields
• Microwave Signatures of Topological Superconductivity in Planar Josephson Junctions
• Gate-tunable Superconductivity in Hybrid InSb-Pb Nanowires
• Magnetic-field dependence of a Josephson traveling-wave parametric amplifier and integration into a high-field setup
• Superconducting-semiconducting voltage-tunable qubits in the third dimension
• Topological Josephson Bifurcation Amplifier: Semiclassical theory
• Gatemon Qubit Revisited for Improved Reliability and Stability
• Quantum dynamics of semiconductor quantum dot Josephson junctions
• High Impedance Granular Aluminum Ring Resonators
• Strongly anharmonic flux-tunable transmon based on InAs-Al 2D heterostructure
• Magnetic-Field and Temperature Limits of a Kinetic-Inductance Traveling-Wave Parametric Amplifier
• Kramers-protected hardware-efficient error correction with Andreev spin qubits