Direct Dispersive Monitoring of Charge Parity in Offset-Charge-Sensitive Transmons

Abstract

A striking characteristic of superconducting circuits is that their eigenspectra and intermode coupling strengths are well predicted by simple Hamiltonians representing combinations of quantum circuit elements. Of particular interest is the Cooper-pair-box Hamiltonian used to describe the eigenspectra of transmon qubits, which can depend strongly on the offset-charge difference across the Josephson element. Notably, this offset-charge dependence can also be observed in the dispersive coupling between an ancillary readout mode and a transmon fabricated in the offset-charge-sensitive (OCS) regime. We utilize this effect to achieve direct, high-fidelity dispersive readout of the joint plasmon and charge-parity state of an OCS transmon, which enables efficient detection of charge fluctuations and nonequilibrium-quasiparticle dynamics. Specifically, we show that additional high-frequency filtering can extend the charge-parity lifetime of our device by two orders of magnitude, resulting in a significantly improved energy relaxation time $T_1\sim 200\mu \mathrm{s}$.

arXiv comment11 pages, 9 figures

References in corpus (46)

• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Charge insensitive qubit design derived from the Cooper pair box
• Helical liquids and Majorana bound states in quantum wires
• Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
• Sideband Cooling Micromechanical Motion to the Quantum Ground State
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
• Bidirectional and efficient conversion between microwave and optical light
• Fluxonium: single Cooper pair circuit free of charge offsets
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
• Surface participation and dielectric loss in superconducting qubits
• Introduction to Quantum Electromagnetic Circuits
• High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity
• Millisecond charge-parity fluctuations and induced decoherence in a superconducting qubit
• Coherent manipulation of Andreev states in superconducting atomic contacts
• Nonequilibrium quasiparticles and $2e$ periodicity in single-Cooper-pair transistors
• Relaxation and frequency shifts induced by quasiparticles in superconducting qubits
• Measurement and Control of Quasiparticle Dynamics in a Superconducting Qubit
• Hot non-equilibrium quasiparticles in transmon qubits
• Quasiparticle dynamics in granular aluminum close to the superconductor to insulator transition
• Analysis and mitigation of interface losses in trenched superconducting coplanar waveguide resonators
• Suppressing relaxation in superconducting qubits by quasiparticle pumping
• Non-Poissonian Quantum Jumps of a Fluxonium Qubit due to Quasiparticle Excitations
• Fluctuations in the electron system of a superconductor exposed to a photon flux
• Circuit QED with fluxonium qubits: theory of the dispersive regime
• Characterization and Reduction of Capacitive Loss Induced by Sub-Micron Josephson Junction Fabrication in Superconducting Qubits
• Cavity Attenuators for Superconducting Qubits
• Trapping a single vortex and reducing quasiparticles in a superconducting resonator
• Kinetics of non-equilibrium quasiparticle tunneling in superconducting charge qubits
• Energy decay and frequency shift of a superconducting qubit from non-equilibrium quasiparticles
• Fabrication of stable and reproducible sub-micron tunnel junctions
• Quasiparticle decay rate of Josephson charge qubit oscillations
• Tunability of microwave transitions as a signature of coherent parity mixing effects in the Majorana-Transmon qubit
• Time-domain measurements of quasiparticle tunneling rates in a single-Cooper-pair transistor
• Quantization of inductively-shunted superconducting circuits
• Quasiparticle trapping in Meissner and vortex states of mesoscopic superconductors
• A fluxonium-based artificial molecule with a tunable magnetic moment
• How many quasiparticles can be in a superconductor?
• Structural instability of driven Josephson circuits prevented by an inductive shunt
• Fermion parity measurement and control in Majorana circuit quantum electrodynamics
• Parity switching and decoherence by quasiparticles in single-junction transmons
• The Quantum Capacitance Detector: A concept for a pair-breaking radiation detector based on the single Cooper-pair box
• Bandwidth and dynamic range of a widely tunable Josephson parametric amplifier
• Dynamics and Energy Distribution of Non-Equilibrium Quasiparticles in Superconducting Tunnel Junctions
• Non-equilibrium quasiparticles in superconducting circuits: photons vs. phonons

Cited by in corpus (65)

• New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
• Engineered Dissipation for Quantum Information Science
• Impact of ionizing radiation on superconducting qubit coherence
• Control and readout of a superconducting qubit using a photonic link
• Protecting a Bosonic Qubit with Autonomous Quantum Error Correction
• Suppression of Unwanted $ZZ$ Interactions in a Hybrid Two-Qubit System
• Scalable High-Performance Fluxonium Quantum Processor
• Singlet-doublet transitions of a quantum dot Josephson junction detected in a transmon circuit
• Seamless high-Q microwave cavities for multimode circuit QED
• Engineering superconducting qubits to reduce quasiparticles and charge noise
• Quasiparticle poisoning of Majorana qubits
• Observation of Josephson Harmonics in Tunnel Junctions
• Phonon downconversion to suppress correlated errors in superconducting qubits
• Photon-assisted charge-parity jumps in a superconducting qubit
• Weyl Josephson Circuits
• Environmental Radiation Impact on Lifetimes and Quasiparticle Tunneling Rates of Fixed-Frequency Transmon Qubits
• Observation of vanishing charge dispersion of a nearly-open superconducting island
• Coexistence of nonequilibrium density and equilibrium energy distribution of quasiparticles in a superconducting qubit
• Resisting high-energy impact events through gap engineering in superconducting qubit arrays
• Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads
• Quasiparticles in superconducting qubits with asymmetric junctions
• Precision measurement of the microwave dielectric loss of sapphire in the quantum regime with parts-per-billion sensitivity
• Distinguishing parity-switching mechanisms in a superconducting qubit
• High Coherence in a Tileable 3D Integrated Superconducting Circuit Architecture
• Destructive Little-Parks Effect in a Full-Shell Nanowire-based Transmon
• Using materials for quasiparticle engineering
• Quantum Microwave Radiometry with a Superconducting Qubit
• A Cooper-Pair Box Coupled to Two Resonators: An Architecture for a Quantum Refrigerator
• Cooper-pair transistor as a minimal topological quantum circuit
• Single-photon detection with a Josephson junction coupled to a resonator
• Free-standing silicon shadow masks for transmon qubit fabrication
• Effects of surface treatments on flux tunable transmon qubits
• Active quasiparticle suppression in a non-equilibrium superconductor
• Sensor-assisted fault mitigation in quantum computation
• Granular Aluminum Parametric Amplifier for Low-Noise Measurements in Tesla Fields
• Quantum phase slips in a resonant Josephson junction
• Quasiparticle tunneling and 1/f charge noise in ultrastrongly coupled superconducting qubit and resonator
• Quasiparticle effects in magnetic-field-resilient 3D transmons
• Minimizing the discrimination time for quantum states of an artificial atom
• Charge dynamics in quantum-circuit refrigeration: thermalization and microwave gain
• Extracting the lifetime of a synthetic two-level system
• Dephasing in Fluxonium Qubits from Coherent Quantum Phase Slips
• Spin Environment of a Superconducting Qubit in High Magnetic Fields
• Parity switching in a full-shell superconductor-semiconductor nanowire qubit
• Continuous Real-Time Detection of Quasiparticle Trapping in Aluminum Nanobridge Josephson Junctions
• Offset Charge Dependence of Measurement-Induced Transitions in Transmons
• Charge-parity switching effects and optimisation of transmon-qubit design parameters
• Quasiperiodic circuit quantum electrodynamics
• Electromotive force in driven topological quantum circuits
• Andreev spin relaxation time in a shadow-evaporated InAs weak link
• Optical Direct Write of Dolan--Niemeyer-Bridge Junctions for Transmon Qubits
• Noise-specific beats in the higher-level Ramsey curves of a transmon qubit
• Superconducting-semiconducting voltage-tunable qubits in the third dimension
• Material matters in superconducting qubits
• Recovery dynamics of a gap-engineered transmon after a quasiparticle burst
• Nonequilibrium regimes for quasiparticles in superconducting qubits with gap-asymmetric junctions
• Protection of quantum information in a chain of Josephson junctions
• Frozonium: Freezing Anharmonicity in Floquet Superconducting Circuits
• Vantablack Shielding of Superconducting Qubit Systems
• Charge Parity Rates in Transmon Qubits with Different Shunting Capacitors
• A superconductor free of quasiparticles for seconds
• Fast and Continuous Detection of Single Microwave Photons via Photo-assisted Quasiparticle Tunneling to a Superconducting Island
• Plasmon Mode Engineering with Electrons on Helium
• Quasiparticle-induced decoherence of a driven superconducting qubit
• Electron-phonon interactions in the Andreev Bound States of aluminum nanobridge Josephson junctions