Observation of vanishing charge dispersion of a nearly-open superconducting island

Abstract

Isolation from the environment determines the extent to which charge is confined on an island, which manifests as Coulomb oscillations such as charge dispersion. We investigate the charge dispersion of a nanowire transmon hosting a quantum dot in the junction. We observe rapid suppression of the charge dispersion with increasing junction transparency, consistent with the predicted scaling law which incorporates two branches of the Josephson potential. We find improved qubit coherence times at the point of highest suppression, suggesting novel approaches for building charge-insensitive qubits.

References in corpus (11)

• Charge insensitive qubit design derived from the Cooper pair box
• Majorana bound states in a coupled quantum-dot hybrid-nanowire system
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Epitaxy of Semiconductor-Superconductor nanowires
• Hard gap in epitaxial semiconductor-superconductor nanowires
• Dynamics of dispersive single qubit read-out in circuit quantum electrodynamics
• Conduction Channels of an InAs-Al nanowire Josephson weak link
• Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon
• Controlling charge quantization with quantum fluctuations
• Andreev Bound States in the Kondo Quantum Dots Coupled to Superconducting Leads
• Controlled DC Monitoring of a Superconducting Qubit

Cited by in corpus (40)

• From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
• Moving beyond the transmon: Noise-protected superconducting quantum circuits
• A Parity-Protected Superconductor-Semiconductor Qubit
• Singlet-doublet transitions of a quantum dot Josephson junction detected in a transmon circuit
• A perspective on semiconductor-based superconducting qubits
• Observation of Josephson Harmonics in Tunnel Junctions
• Bogoliubov Quasiparticles in Superconducting Qubits
• Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon
• A gate-tunable, field-compatible fluxonium
• Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads
• Microwave response of an Andreev bound state
• Destructive Little-Parks Effect in a Full-Shell Nanowire-based Transmon
• Proximity superconductivity in atom-by-atom crafted quantum dots
• Minimal Kitaev-transmon qubit based on double quantum dots
• Magnetic-Field-Compatible Superconducting Transmon Qubit
• Mitigation of quasiparticle loss in superconducting qubits by phonon scattering
• Majorana oscillations and parity crossings in semiconductor-nanowire-based transmon qubits
• Superconducting islands with semiconductor-nanowire-based topological Josephson junctions
• Gatemon qubit based on a thin InAs-Al hybrid nanowire
• Zeeman-driven parity transitions in an Andreev quantum dot
• Flip-chip-based microwave spectroscopy of Andreev bound states in a planar Josephson junction
• Andreev Modes from Phase Winding in a Full-shell Nanowire-based Transmon
• Quantum circuits with multiterminal Josephson-Andreev junctions
• Enhanced coherence in superconducting circuits via band engineering
• Microwave Sensing of Andreev Bound States in a Gate-Defined Superconducting Quantum Point Contact
• Quantum phase slips in a resonant Josephson junction
• Voltage-controlled synthesis of higher harmonics in hybrid Josephson junction circuits
• Few-mode to mesoscopic junctions in gatemon qubits
• Parity switching in a full-shell superconductor-semiconductor nanowire qubit
• Gate-Compatible Circuit Quantum Electrodynamics in a Three-Dimensional Cavity Architecture
• Nonlinearity of transparent SNS weak links decreases sharply with length
• Andreev spin relaxation time in a shadow-evaporated InAs weak link
• Tunneling of fluxons via a Josephson resonant level
• Superconducting-semiconducting voltage-tunable qubits in the third dimension
• Microwave Andreev bound state spectroscopy in a semiconductor-based Planar Josephson junction
• Quantum dynamics of semiconductor quantum dot Josephson junctions
• Strongly anharmonic flux-tunable transmon based on InAs-Al 2D heterostructure
• Microwave susceptibility observation of interacting many-body Andreev states
• Time-reversal symmetric topological superconductivity in Machida-Shibata lattices
• Hybrid superinductance with Al/InAs