Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture

Abstract

Superconducting quantum circuits based on Josephson junctions have made rapid progress in demonstrating quantum behavior and scalability. However, the future prospects ultimately depend upon the intrinsic coherence of Josephson junctions, and whether superconducting qubits can be adequately isolated from their environment. We introduce a new architecture for superconducting quantum circuits employing a three dimensional resonator that suppresses qubit decoherence while maintaining sufficient coupling to the control signal. With the new architecture, we demonstrate that Josephson junction qubits are highly coherent, with $T_2\sim 10\mu$s to $20\mu$s without the use of spin echo, and highly stable, showing no evidence for $1/f$ critical current noise. These results suggest that the overall quality of Josephson junctions in these qubits will allow error rates of a few $10^{-4}$, approaching the error correction threshold.

5 pages, 3 figures, 1 table. Accepted to Phys. Rev. Lett

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• Quantum State Sensitivity of an Autoresonant Superconducting Circuit
• High-efficiency arbitrary quantum operation on a high-dimensional quantum system
• Cryogenic Microwave Filter Cavity with a Tunability Greater than 5 GHz
• Realization of a binary-outcome projection measurement of a three-level superconducting quantum system
• Nonlinear Spectroscopy of Trapped Ions
• Compact 3D quantum memory
• Wireless Josephson Amplifier
• 1/f noise of Josephson-junction-embedded microwave resonators at single photon energies and millikelvin temperatures
• Observation of Momentum Space Josephson Effects
• Tunable Coupler for Mediating Interactions between a Two-Level System and a Waveguide from a Decoupled State to the Ultra-Strong Coupling Regime
• Modelling Enclosures for Large-Scale Superconducting Quantum Circuits
• Algebraic canonical quantization of lumped superconducting networks
• Transferring arbitrary d-dimensional quantum states of a superconducting qudit in circuit QED
• Deterministic Many-Resonator W Entanglement of Nearly Arbitrary Microwave States via Attractive Bose-Hubbard Simulation
• Landau-Zener-Stuckelberg-Majorana interference in a 3D transmon driven by a chirped microwave
• Closing a quantum feedback loop inside a cryostat: Autonomous state preparation and long-time memory of a superconducting qubit
• Decay-protected superconducting qubit with fast control enabled by integrated on-chip filters
• Characterizing a Four-Qubit Planar Lattice for Arbitrary Error Detection
• Decoherence predictions in a superconductive quantum device using the steepest-entropy-ascent quantum thermodynamics framework
• Superconducting Caps for Quantum Integrated Circuits
• Continuous measurements for control of superconducting quantum circuits
• The Ohmic two-state system from the perspective of the interacting resonant level model: Thermodynamics and transient dynamics
• Quasiparticle dynamics in a superconducting qubit irradiated by a localized infrared source
• Microwave Packaging for Superconducting Qubits
• Role of the quasi-particles in an electric circuit with Josephson junctions
• Multiplexing Superconducting Qubit Circuit for Single Microwave Photon Generation
• Universal stabilization of single-qubit states using a tunable coupler
• Machine-learning based three-qubit gate for realization of a Toffoli gate with cQED-based transmon systems
• Fundamental limitations for measurements in quantum many-body systems
• High fidelity single-shot readout of a transmon qubit using a SLUG μwave amplifier
• Strategy for implementing stabilizer-based codes on solid-state qubits
• Demonstration of Hopf-link semimetal bands with superconducting circuits
• A Review of Design Concerns in Superconducting Quantum Circuits
• Optical drive of macroscopic mechanical motion by a single two-level system
• Qubit dephasing due to Quasiparticle Tunneling
• Site-wise manipulations and Mott insulator-superfluid transition of interacting photons using superconducting circuit simulators
• Introduction of DC line structures into a superconducting microwave 3D cavity
• 1/f Noise from the Laws of Thermodynamics for Finite-Size Fluctuations
• Development of transmon qubits solely from optical lithography on 300mm wafers
• Manipulating Fock states of a harmonic oscillator while preserving its linearity
• Rate of tunneling nonequilibrium quasiparticles in superconducting qubits
• Lecture Notes on Quantum Electrical Circuits
• High-quality superconducting α-Ta film sputtered on heated silicon substrate
• Parametric four-wave mixing toolbox for superconducting resonators
• Compact vacuum gap transmon qubits: Selective and sensitive probes for superconductor surface losses
• Meissner transmon qubit - architecture and characterization
• Single-step transfer or exchange of multipartite quantum entanglement with minimum resources
• Fluctuation Spectroscopy of Two-Level Systems in Superconducting Resonators
• Circuit QED flip-flop memory with all-microwave switching
• A split-cavity design for the incorporation of a DC bias in a 3D microwave cavity
• Characterisation of Cryogenic Material Properties of 3D-Printed Superconducting Niobium using a 3D Lumped Element Microwave Cavity
• Enhancement and state tomography of a squeezed vacuum with circuit quantum electrodynamics
• Intrinsic Photon Loss at the Interface of Superconducting Devices
• SQ-CARS: A Scalable Quantum Control and Readout System
• Quasiparticle effects in magnetic-field-resilient 3D transmons
• Circuit QED-based measurement of vortex lattice order in a Josephson junction array
• Multiqubit quantum phase gate using four-level superconducting quantum interference devices coupled to superconducting resonator
• Quantum Simulation of the Fermion-Boson Composite Quasi-Particles with a Driven Qubit-Magnon Hybrid Quantum System
• How long does it take to implement a projective measurement?
• Generating multipartite entangled states of qubits distributed in different cavities
• Anti-Dynamical Casimir Effect as a Resource for Work Extraction
• Democratizing Spin Qubits
• Logical measurement-based quantum computation in circuit-QED
• A three-dimensional Josephson parametric amplifier
• Ancilla-Error-Transparent Controlled Beam Splitter Gate
• Hot electron heatsinks for microwave attenuators below 100 mK
• NSQUID arrays as conveyers of quantum information
• Tradeoff between Leakage and Dephasing Errors in the Fluxonium Qubit
• Nearly quantum-limited Josephson-junction Frequency Comb synthesizer
• Phenomenological noise model for superconducting qubits: two-state fluctuators and 1=f noise
• Quantum error correction benchmarks for continuous weak parity measurements
• Parity measurement of remote qubits using dispersive coupling and photodetection
• Maxwell's demon in superconducting circuits
• Reconfigurable re-entrant cavity for wireless coupling to an electro-optomechanical device
• Gate-Compatible Circuit Quantum Electrodynamics in a Three-Dimensional Cavity Architecture
• Hybrid Two-Qubit Gate using Circuit QED System with Triple-Leg Stripline Resonator
• Characterization of drive-induced unwanted state transitions in superconducting circuits
• A fast tunable 3D-transmon architecture for superconducting qubit-based hybrid devices
• An optomechanical platform with a 3-dimensional waveguide cavity
• Dissipation by normal-metal traps in transmon qubits
• Quantum process inference for a single qubit Maxwell's demon
• Observation of discrete charge states of a coherent two-level system in a superconducting qubit
• Photon-number resolution with microwave Josephson photomultipliers
• Realisation of Qudits in Coupled Potential Wells
• Implementation of standard quantum error correction codes for solid-state qubits
• Nonlinear Signal Distortion Corrections Through Quantum Sensing
• Highly Controllable Qubit-Bath Coupling Based on a Sequence of Resonators
• Speeding up antidynamical Casimir effect with nonstationary qutrits
• Demonstration of a general fault-tolerant quantum error detection code for (2n+1)-qubit entangled state on IBM 16-qubit quantum computer
• Towards the Heisenberg limit in microwave photon detection by a qubit array
• Can the displacemon device test objective collapse models?
• Fast ZZ-Free Entangling Gates for Superconducting Qubits Assisted by a Driven Resonator
• Superradiant phase transition induced by the indirect Rabi interaction
• The superconducting circuit companion -- an introduction with worked examples
• Direct spectrum analysis using a threshold detector with application to a superconducting circuit
• Analysis of a single-mode waveguide at sub-terahertz frequencies as a communication channel
• Decoherence in a Pair of Long-Lived Cooper-Pair Boxes
• Using the inductive-energy participation ratio to characterize a superconducting quantum chip
• Copper waveguide cavities with reduced surface loss for coupling to superconducting qubits
• Control of transition frequency of a superconducting flux qubit by longitudinal coupling to the photon number degree of freedom in a resonator
• Optical Direct Write of Dolan--Niemeyer-Bridge Junctions for Transmon Qubits
• Material matters in superconducting qubits
• Quantum Decoherence of Charge Qubit coupled to Nonlinear Nanomechanical Resonator
• Soliton versus single photon quantum dynamics in arrays of superconducting qubits
• Probing higher-order transitions through scattering of microwave photons in the ultrastrong-coupling regime of circuit QED
• The nontrivial effects of annealing on superconducting properties of Nb single crystals
• Unified simulation methods for quantum acoustic devices
• External control of qubit-photon interaction and multi-qubit reset in a dissipative quantum network
• Phase transitions induced by standard and predetermined measurements in transmon arrays
• A Wigner quasiprobability distribution of work
• Inverse iteration quantum eigensolvers assisted with a continuous variable
• Ultrastrong magnetic light-matter interaction with cavity mode engineering
• Recovery of a SINIS turnstile accuracy in a strongly non-equilibrium regime
• Recovery dynamics of a gap-engineered transmon after a quasiparticle burst
• The Interspersed Spin Boson Lattice Model
• Bias current dependence of superconducting transition temperature in superconducting spin valve nanowires
• Integration of graphene-based superconducting quantum circuits in 3D cavity
• Loss-tolerant parity measurement for distant quantum bits
• Theory of quasiparticle-induced errors in driven-dissipative Schrödinger cat qubits
• Quantum electrodynamics of non-demolition detection of single microwave photon by superconducting qubit array
• Magnetization in a non-equilibrium quantum spin system
• Numerical evaluation of the fidelity error threshold for the surface code
• Mitigation of noise in Josephson parametric oscillator by injection locking
• Tunable quantum interference effects in Floquet two- and three-level systems
• Excitation spectrum as a resource for efficient two-qubit entangling gates
• Vantablack Shielding of Superconducting Qubit Systems
• Towards Efficient Superconducting Quantum Processor Architecture Design
• Observation of Higher-Order Sideband Transitions and First-Order Sideband Rabi Oscillations in a Superconducting Flux Qubit Coupled to a SQUID Plasma Mode
• Room temperature cavity electromechanics in the sideband-resolved regime
• Two-photon processes based on quantum commutators
• Two-mode squeezing operator in circuit QED
• Visualizing the emission of a single photon with frequency and time resolved spectroscopy
• Violating Bell's inequality with an artificial atom and a cat state in a cavity
• Quasiparticle spectroscopy in technologically-relevant niobium using London penetration depth measurements
• Tutorial on Superconducting Quantum Circuits: From Basics to Applications
• Continuous monitoring measured signals bounded by past and future conditions in enlarged quantum systems
• High-Impedance Microwave Resonators with Two-Photon Nonlinear Effects
• Metallised 3D printed plastic resonator demonstrates superconductivity below 4 K
• Linear response theory of Josephson junction arrays in a microwave cavity
• Creation of superposition of arbitrary states encoded in two three-dimensional cavities
• Excess quasiparticles and their dynamics in the presence of subgap states
• Robust quantification of spectral transitions in perturbed quantum systems
• Perfect transfer of arbitrary continuous variable states across optical waveguide lattices
• Operation of a high-frequency, phase-slip qubit
• Parity-protected superconducting qubit based on topological insulators
• Qubit dephasing by spectrally diffusing quantum two-level systems
• Cross-resonance control of an oscillator with an auxiliary fluxonium qubit
• Theory of absorption spectrum in the nonequilibrium steady state of superconductors under microwave irradiation
• Non-Gaussian macroscopic entanglement of motion in a hybrid electromechanical device
• Electron-phonon heat transfer in giant vortex states
• Electron-photon coupling in Mesoscopic Quantum Electrodynamics
• The field induced magnetic dipolar interaction for general boundary conditions
• Transferring multipartite entanglement among different cavities
• Superconducting metamaterials and qubits
• The Dynamical Stripes in Spin-Orbit Coupled Bose-Einstein Condensates with Josephson Junctions
• Generation of time-frequency entangled photon pairs propagating in separate waveguides in circuit QED setup
• Inducing nontrivial qubit coherence through a controlled dispersive environment
• Tunable single-photon heat conduction in electrical circuits
• A three-dimensional multimode lumped-element resonator for collective spin manipulation and dispersive readout
• Phase-controlled improvement of photon lifetime in coupled superconducting cavities
• Entangling continuous variables with a qubit array
• Construction of controlled-NOT gate based on microwave-activated phase (MAP) gate in two transmon system
• Two-photon exchange interaction from Dicke Hamiltonian under parametric modulation
• Micromachined integrated quantum circuit containing a superconducting qubit
• Mapping Surface Code to Superconducting Quantum Processors
• Quantum feedback for measurement and control
• Protocol for temperature sensing using a three-level transmon circuit
• Interacting Defects Generate Stochastic Fluctuations in Superconducting Qubits
• Review of Superconducting Qubit Devices and Their Large-Scale Integration
• Electric-Field Control of Josephson Oscillations in Dipolar Bose-Einstein Condensates
• Exploring the quantum capacity of a Gaussian random displacement channel using Gottesman-Kitaev-Preskill codes and maximum likelihood decoding
• Robust multi-mode superconducting circuit optimized for quantum information processing
• Global estimates of errors in quantum computation by the Feynman-Vernon formalism
• Quantum coherence between cavity and artificial atom in a superconducting circuit QED ladder system
• Magnetic dipole-dipole interaction induced by the electromagnetic field
• Manipulation of two quantum systems through their mutual interaction in presence of a radiation field
• From Quantum Optics to Quantum Technologies
• Ultimate quantum limit for amplification: a single atom in front of a mirror