Protecting superconducting qubits from external sources of loss and heat

Abstract

We characterize a superconducting qubit before and after embedding it along with its package in an absorptive medium. We observe a drastic improvement in the effective qubit temperature and over a tenfold improvement in the relaxation time up to 5.7 $\mu$s. Our results suggest the presence of external radiation inside the cryogenic apparatus can be a limiting factor for both qubit initialization and coherence. We infer from simple calculations that relaxation is not limited by thermal photons in the sample prior to embedding, but by dissipation arising from quasiparticle generation.

3 figures

References in corpus (8)

• Charge insensitive qubit design derived from the Cooper pair box
• Controlling the spontaneous emission of a superconducting transmon qubit
• Decoherence of flux qubits due to 1/f flux noise
• Loss and decoherence due to stray infrared light in superconducting quantum circuits
• Number fluctuations of sparse quasiparticles in a superconductor
• Quasiparticle relaxation of superconducting qubits in the presence of flux
• Energy decay and frequency shift of a superconducting qubit from non-equilibrium quasiparticles
• Wirebond crosstalk and cavity modes in large chip mounts for superconducting qubits

Cited by in corpus (117)

• Circuit Quantum Electrodynamics
• A Quantum Engineer's Guide to Superconducting Qubits
• Building logical qubits in a superconducting quantum computing system
• The Flux Qubit Revisited to Enhance Coherence and Reproducibility
• Superconducting qubit in waveguide cavity with coherence time approaching 0.1ms
• New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
• High-threshold and low-overhead fault-tolerant quantum memory
• A Semiconductor Nanowire-Based Superconducting Qubit
• Engineering cryogenic setups for 100-qubit scale superconducting circuit systems
• Complete universal quantum gate set approaching fault-tolerant thresholds with superconducting qubits
• Superconducting Quantum Computing: A Review
• A quantum memory with near-millisecond coherence in circuit QED
• Surface participation and dielectric loss in superconducting qubits
• Characterization of addressability by simultaneous randomized benchmarking
• Majorana qubit decoherence by quasiparticle poisoning
• Hybrid circuit cavity quantum electrodynamics with a micromechanical resonator
• Implementing a strand of a scalable fault-tolerant quantum computing fabric
• Quantum back-action of variable-strength measurement
• Improved superconducting qubit coherence using titanium nitride
• Materials loss measurements using superconducting microwave resonators
• Impact of ionizing radiation on superconducting qubit coherence
• Demonstrating a Driven Reset Protocol of a Superconducting Qubit
• Hot non-equilibrium quasiparticles in transmon qubits
• Process verification of two-qubit quantum gates by randomized benchmarking
• Control and readout of a superconducting qubit using a photonic link
• Resolving catastrophic error bursts from cosmic rays in large arrays of superconducting qubits
• Feedback control of a solid-state qubit using high-fidelity projective measurement
• Demonstration of weight-four parity measurements in the surface code architecture
• Heralded state preparation in a superconducting qubit
• Thermal and Residual Excited-State Population in a 3D Transmon Qubit
• Initialization by measurement of a two-qubit superconducting circuit
• Photon Shot Noise Dephasing in the Strong-Dispersive Limit of Circuit QED
• Entanglement of two superconducting qubits in a waveguide cavity via monochromatic two-photon excitation
• Evidence of a nonequilibrium distribution of quasiparticles in the microwave response of a superconducting aluminium resonator
• Digital coherent control of a superconducting qubit
• Microwave-activated conditional-phase gate for superconducting qubits
• Universal stabilization of a parametrically coupled qubit
• Persistent control of a superconducting qubit by stroboscopic measurement feedback
• Suppression of Unwanted $ZZ$ Interactions in a Hybrid Two-Qubit System
• Trapping a single vortex and reducing quasiparticles in a superconducting resonator
• Decoherence of superconducting qubits caused by quasiparticle tunneling
• Investigating surface loss effects in superconducting transmon qubits
• Improving the Quality Factor of Microwave Compact Resonators by Optimizing their Geometrical Parameters
• Decoherence of Majorana qubits by noisy gates
• Scalable quantum computer with superconducting circuits in the ultrastrong coupling regime
• Flexible superconducting Nb transmission lines on thin film polyimide for quantum computing applications
• TLS Dynamics in a Superconducting Qubit Due to Background Ionizing Radiation
• Excitation of superconducting qubits from hot non-equilibrium quasiparticles
• Environmental Radiation Impact on Lifetimes and Quasiparticle Tunneling Rates of Fixed-Frequency Transmon Qubits
• The Quantum Socket: Three-Dimensional Wiring for Extensible Quantum Computing
• Time-Reversal Symmetrization of Spontaneous Emission for High Fidelity Quantum State Transfer
• Fluctuations From Edge Defects in Superconducting Resonators
• Coherence in a transmon qubit with epitaxial tunnel junctions
• Measurements of nanoresonator-qubit interactions in a hybrid quantum electromechanical system
• Microwave-induced excess quasiparticles in superconducting resonators measured through correlated conductivity fluctuations
• Quasiparticle trapping in Meissner and vortex states of mesoscopic superconductors
• Leggett--Garg inequality violations with a large ensemble of qubits
• A long-lived capacitively shunted flux qubit embedded in a 3D cavity
• Probing quasiparticle excitations in a hybrid single electron transistor
• Control and Coherence Time Enhancement of the 0-$\pi$ Qubit
• Parity switching and decoherence by quasiparticles in single-junction transmons
• Observation of Autler-Townes effect in a dispersively dressed Jaynes-Cummings system
• Low-Loss Superconducting Nanowire Circuits Using a Neon Focused Ion Beam
• Long-lived, radiation-suppressed superconducting quantum bit in a planar geometry
• Engineering the microwave to infrared noise photon flux for superconducting quantum systems
• A Stress Induced Source of Phonon Bursts and Quasiparticle Poisoning
• All-optical single-shot readout of a superconducting qubit
• Optimal control for fast and high-fidelity quantum gates in coupled superconducting flux qubits
• Identifying capacitive and inductive loss in lumped element superconducting hybrid titanium nitride/aluminum resonators
• Relaxation of Nonequilibrium Quasiparticles in Mesoscopic Size Superconductors
• Fabrication and surface treatment of electron-beam evaporated niobium for low-loss coplanar waveguide resonators
• Measuring effective temperatures of qubits using correlations
• Dynamical parity selection in superconducting weak links
• Second-order decoherence mechanisms of a transmon qubit probed with thermal microwave states
• Nonlinear microwave photon-occupancy of a driven resonator strongly coupled to a transmon qubit
• A flux tunable superconducting quantum circuit based on Weyl semimetal MoTe2
• Gatemon qubit on a germanium quantum-well heterostructure
• Quasiparticle dynamics in a superconducting qubit irradiated by a localized infrared source
• Characterizing a Four-Qubit Planar Lattice for Arbitrary Error Detection
• A Toffoli Gate Decomposition via Echoed Cross-Resonance Gates
• High fidelity single-shot readout of a transmon qubit using a SLUG μwave amplifier
• Rate of tunneling nonequilibrium quasiparticles in superconducting qubits
• Preparing ground states of the XXZ model using the quantum annealing with inductively coupled superconducting flux qubits
• Quasiparticle effects in magnetic-field-resilient 3D transmons
• The quantum transverse-field Ising chain in circuit QED: effects of disorder on the nonequilibrium dynamics
• Low-temperature environments for quantum computation and quantum simulation
• Multi-Purpose Architecture for Fast Reset and Protective Readout of Superconducting Qubits
• Charge-parity switching effects and optimisation of transmon-qubit design parameters
• A self-calibrating superconducting pair-breaking detector
• An engineering guide to superconducting quantum circuit shielding
• Spurious Antenna Modes of the Transmon Qubit
• Material matters in superconducting qubits
• Copper waveguide cavities with reduced surface loss for coupling to superconducting qubits
• Decoherence in a Pair of Long-Lived Cooper-Pair Boxes
• Optical Direct Write of Dolan--Niemeyer-Bridge Junctions for Transmon Qubits
• Recovery of a SINIS turnstile accuracy in a strongly non-equilibrium regime
• Leveraging collective effects for thermometry in waveguide quantum electrodynamics
• Cooper pair tunnelling and quasiparticle poisoning in a galvanically isolated superconducting double dot
• Identification and Mitigation of Conducting Package Losses for Quantum Superconducting Devices
• Characterising superconducting filters using residual microwave background
• Integration of graphene-based superconducting quantum circuits in 3D cavity
• On the Efficacy of Surface Codes in Compensating for Radiation Events in Superconducting Devices
• On-demand shaped photon emission based on a parametrically modulated qubit
• Superconducting atomic contacts inductively coupled to a microwave resonator
• Vantablack Shielding of Superconducting Qubit Systems
• Charge Parity Rates in Transmon Qubits with Different Shunting Capacitors
• Full control of superconducting qubits with combined on-chip microwave and flux lines
• Hydrogen crystals reduce dissipation in superconducting resonators
• Probing Complex Decoherence Processes in Materials for Quantum Applications
• Performance-centric roadmap for building a superconducting quantum computer
• Electron-phonon heat transfer in giant vortex states
• Genetic-algorithm-aided ultra-broadband perfect absorbers using plasmonic metamaterials
• Protocol for temperature sensing using a three-level transmon circuit
• A review of simulation, measurement techniques, and development in chip thermal design
• Dynamics of a dispersively coupled transmon qubit in the presence of a noise source embedded in the control line
• Dynamic phases induced by two-level system defects on driven qubits
• Electron-phonon interactions in the Andreev Bound States of aluminum nanobridge Josephson junctions