Rapid high-fidelity multiplexed readout of superconducting qubits

Abstract

The duration and fidelity of qubit readout is a critical factor for applications in quantum information processing as it limits the fidelity of algorithms which reuse qubits after measurement or apply feedback based on the measurement result. Here we present fast multiplexed readout of five qubits in a single 1.2 GHz wide readout channel. Using a readout pulse length of 80 ns and populating readout resonators for less than 250 ns we find an average correct assignment probability for the five measured qubits to be $97\%$. The differences between the individual readout errors and those found when measuring the qubits simultaneously are within $1\%$. We employ individual Purcell filters for each readout resonator to suppress off-resonant driving, which we characterize by the dephasing imposed on unintentionally measured qubits. We expect the here presented readout scheme to become particularly useful for the selective readout of individual qubits in multi-qubit quantum processors.

13 pages, 10 figures

References in corpus (28)

• Charge insensitive qubit design derived from the Cooper pair box
• Surface codes: Towards practical large-scale quantum computation
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• Amplification and squeezing of quantum noise with a tunable Josephson metamaterial
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Detecting arbitrary quantum errors via stabilizer measurements on a sublattice of the surface code
• A blueprint for demonstrating quantum supremacy with superconducting qubits
• 10-qubit entanglement and parallel logic operations with a superconducting circuit
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
• Observation of quantum jumps in a superconducting artificial atom
• Realizing Rapid, High-Fidelity, Single-Shot Dispersive Readout of Superconducting Qubits
• Dispersive regime of circuit QED: photon-dependent qubit dephasing and relaxation rates
• Demonstration of Universal Parametric Entangling Gates on a Multi-Qubit Lattice
• Single-shot qubit readout in circuit Quantum Electrodynamics
• Single-shot qubit readout in circuit Quantum Electrodynamics
• Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit
• Scalable quantum circuit and control for a superconducting surface code
• Thermal and Residual Excited-State Population in a 3D Transmon Qubit
• Quantum limited amplification and entanglement in coupled nonlinear resonators
• Initialization by measurement of a two-qubit superconducting circuit
• Two-Qubit State Tomography using a Joint Dispersive Read-Out
• Josephson junction-embedded transmission-line resonators: from Kerr medium to in-line transmon
• Protocols for optimal readout of qubits using a continuous quantum nondemolition measurement
• Measurement-induced qubit state mixing in circuit QED from up-converted dephasing noise
• Frequency Division Multiplexing Readout and Simultaneous Manipulation of an Array of Flux Qubits
• General method for extracting the quantum efficiency of dispersive qubit readout in circuit QED
• Low-Latency Digital Signal Processing for Feedback and Feedforward in Quantum Computing and Communication
• Multiplexed Readout of Transmon Qubits with Josephson Bifurcation Amplifiers

Cited by in corpus (162)

• Circuit Quantum Electrodynamics
• Realizing Repeated Quantum Error Correction in a Distance-Three Surface Code
• Quantum Error Mitigation
• Engineering cryogenic setups for 100-qubit scale superconducting circuit systems
• Mitigating measurement errors in multi-qubit experiments
• Repeated Quantum Error Detection in a Surface Code
• Building a fault-tolerant quantum computer using concatenated cat codes
• Efficient and Noise Resilient Measurements for Quantum Chemistry on Near-Term Quantum Computers
• Detecting crosstalk errors in quantum information processors
• Superconductor-semiconductor hybrid cavity quantum electrodynamics
• A fast, low-leakage, high-fidelity two-qubit gate for a programmable superconducting quantum computer
• Leakage reduction in fast superconducting qubit gates via optimal control
• Qiskit Pulse: Programming Quantum Computers Through the Cloud with Pulses
• Implementation of Conditional-Phase Gates based on tunable ZZ-Interactions
• Towards Scalable Bosonic Quantum Error Correction
• 64-Qubit Quantum Circuit Simulation
• Logical-qubit operations in an error-detecting surface code
• Tutorial: Gate-based superconducting quantum computing
• High-fidelity controlled-Z gate with maximal intermediate leakage operating at the speed limit in a superconducting quantum processor
• A photonic crystal Josephson traveling wave parametric amplifier
• A scalable superconducting quantum simulator with long-range connectivity based on a photonic bandgap metamaterial
• High-contrast ZZ interaction using superconducting qubits with opposite-sign anharmonicity
• Entanglement Stabilization using Parity Detection and Real-Time Feedback in Superconducting Circuits
• Scalable High-Performance Fluxonium Quantum Processor
• Transmon qubit readout fidelity at the threshold for quantum error correction without a quantum-limited amplifier
• Singlet-doublet transitions of a quantum dot Josephson junction detected in a transmon circuit
• Rapid and Unconditional Parametric Reset Protocol for Tunable Superconducting Qubits
• Broadband Squeezed Microwaves and Amplification with a Josephson Traveling-Wave Parametric Amplifier
• Improving the Performance of Deep Quantum Optimization Algorithms with Continuous Gate Sets
• Long-distance transmon coupler with CZ gate fidelity above $99.8\%$
• Protecting quantum entanglement from leakage and qubit errors via repetitive parity measurements
• Variational preparation of finite-temperature states on a quantum computer
• Demonstrating a long-coherence dual-rail erasure qubit using tunable transmons
• Leakage detection for a transmon-based surface code
• Realizing the two-dimensional hard-core Bose-Hubbard model with superconducting qubits
• Magnon-photon strong coupling for tunable microwave circulators
• Josephson Array Mode Parametric Amplifier
• Quantum metrology with imperfect measurements
• Demonstration of an All-Microwave Controlled-Phase Gate between Far Detuned Qubits
• Universal cost bound of quantum error mitigation based on quantum estimation theory
• Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory
• Non-degenerate parametric amplifiers based on dispersion engineered Josephson junction arrays
• Overcoming I/O bottleneck in superconducting quantum computing: multiplexed qubit control with ultra-low-power, base-temperature cryo-CMOS multiplexer
• Kinetic Inductance Traveling Wave Amplifiers For Multiplexed Qubit Readout
• Path toward manufacturable superconducting qubits with relaxation times exceeding 0.1 ms
• Large dispersive interaction between a CMOS double quantum dot and microwave photons
• All-microwave leakage reduction units for quantum error correction with superconducting transmon qubits
• A hardware-efficient leakage-reduction scheme for quantum error correction with superconducting transmon qubits
• Reservoir Computing Approach to Quantum State Measurement
• Floquet-Mode Traveling-Wave Parametric Amplifiers
• High Coherence in a Tileable 3D Integrated Superconducting Circuit Architecture
• Qubit Measurement by Multichannel Driving
• High-Fidelity Measurement of a Superconducting Qubit using an On-Chip Microwave Photon Counter
• Distributed quantum error correction for chip-level catastrophic errors
• Long-range connectivity in a superconducting quantum processor using a ring resonator
• Model-based Optimization of Superconducting Qubit Readout
• Quantum Divide and Compute: Exploring The Effect of Different Noise Sources
• Efficient and Low-Backaction Quantum Measurement Using a Chip-Scale Detector
• Ideal Quantum Nondemolition Readout of a Flux Qubit Without Purcell Limitations
• Scaling Qubit Readout with Hardware Efficient Machine Learning Architectures
• All-optical single-shot readout of a superconducting qubit
• Single-Shot Readout of a Superconducting Qubit Using a Thermal Detector
• Millikelvin temperature cryo-CMOS multiplexer for scalable quantum device characterisation
• Mitigation of quasiparticle loss in superconducting qubits by phonon scattering
• Demonstration of a parity-time symmetry breaking phase transition using superconducting and trapped-ion qutrits
• Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering
• Multiplexed photon number measurement
• Fast Flux-Activated Leakage Reduction for Superconducting Quantum Circuits
• Benchmarking the readout of a superconducting qubit for repeated measurements
• Tunable refrigerator for non-linear quantum electric circuits
• Broadband lumped-element Josephson parametric amplifier with single-step lithography
• State preparation of a fluxonium qubit with feedback from a custom FPGA-based platform
• Intermodulation Distortion in a Josephson Traveling Wave Parametric Amplifier
• A Practical Introduction to Benchmarking and Characterization of Quantum Computers
• Reducing the error rate of a superconducting logical qubit using analog readout information
• Demonstration of low-overhead quantum error correction codes
• Vulnerability to Parameter Spread in Josephson Traveling-Wave Parametric Amplifiers
• Gate control of superconducting current: Mechanisms, parameters and technological potential
• Cloaking a qubit in a cavity
• IQ Mixer Calibration for Superconducting Circuits
• Measuring effective temperatures of qubits using correlations
• Lattice gauge theory and dynamical quantum phase transitions using noisy intermediate scale quantum devices
• Quantum rifling: protecting a qubit from measurement back-action
• Anti-crosstalk high-fidelity state discrimination for superconducting qubits
• Conditionally rigorous mitigation of multiqubit measurement errors
• Characterization of NbTiN films with thicknesses below 20 nm for low power kinetic inductance amplifiers
• Qibolab: an open-source hybrid quantum operating system
• Fast, Lifetime-Preserving Readout for High-Coherence Quantum Annealers
• On-Premises Superconducting Quantum Computer for Education and Research
• Modelling Enclosures for Large-Scale Superconducting Quantum Circuits
• Neural network decoder for near-term surface-code experiments
• Dissipative Quantum Chaos unveiled by Stochastic Quantum Trajectories
• Fault-tolerant quantum architectures based on erasure qubits
• Post-fabrication frequency trimming of coplanar-waveguide resonators in circuit QED quantum processors
• Broadband Bandpass Purcell Filter for Circuit Quantum Electrodynamics
• Calibration of cryogenic amplification chains using normal-metal--insulator--superconductor junctions
• Compact superconducting microwave resonators based on Al-AlOx-Al capacitor
• Mechanical Purcell Filters for Microwave Quantum Machines
• Engineering Cross Resonance Interaction in Multi-modal Quantum Circuits
• SQ-CARS: A Scalable Quantum Control and Readout System
• Experimentally verified, fast analytic and numerical design of superconducting resonators in flip-chip architectures
• Quasi-Probabilistic Readout Correction of Mid-Circuit Measurements for Adaptive Feedback via Measurement Randomized Compiling
• Efficient decoupling of a non-linear qubit mode from its environment
• Quantum entanglement recognition
• The scattering coefficients of superconducting microwave resonators: II. System-bath approach
• Mitigating Errors on Superconducting Quantum Processors through Fuzzy Clustering
• Improved Parameter Targeting in 3D-Integrated Superconducting Circuits through a Polymer Spacer Process
• Complete physical characterization of QND measurements via tomography
• Continuous microwave photon counting by semiconductor-superconductor hybrids
• Josephson traveling-wave parametric amplifier based on low-intrinsic-loss coplanar lumped-element waveguide
• Multi-Purpose Architecture for Fast Reset and Protective Readout of Superconducting Qubits
• Radio frequency mixing modules for superconducting qubit room temperature control systems
• Characterization and tomography of a hidden qubit
• Interferometric Purcell suppression of spontaneous emission in a superconducting qubit
• Realizing Lattice Surgery on Two Distance-Three Repetition Codes with Superconducting Qubits
• Characterization of Broadband Purcell Filters with Compact Footprint for Fast Multiplexed Superconducting Qubit Readout
• Charge-parity switching effects and optimisation of transmon-qubit design parameters
• Flux-pulse-assisted Readout of a Fluxonium Qubit
• Loss resilience of driven-dissipative remote entanglement in chiral waveguide quantum electrodynamics
• Realizing a Continuous Set of Two-Qubit Gates Parameterized by an Idle Time
• What is measured when a qubit measurement is performed on a multi-qubit chip?
• Parametric multi-element coupling architecture for coherent and dissipative control of superconducting qubits
• Selective Single and Double-Mode Quantum Limited Amplifier
• Transmon-qubit readout using in-situ bifurcation amplification in the mesoscopic regime
• Realization of Constant-Depth Fan-Out with Real-Time Feedforward on a Superconducting Quantum Processor
• High-efficiency microwave photodetection by cavity coupled double dots with single cavity-photon sensitivity
• Directional emission of a readout resonator for qubit measurement
• Robust Finite-Temperature Many-Body Scarring on a Quantum Computer
• Quantum chip design optimization and automation in superconducting coupler architecture
• Enhancing qubit readout with Bayesian Learning
• Low power, fast and broadband ESR quantum control using a stripline resonator
• Benchmarking the quality of multiplexed qubit readout beyond assignment fidelity
• Wireless Josephson parametric amplifier above 20 GHz
• Universal framework for simultaneous tomography of quantum states and SPAM noise
• Pure kinetic inductance coupling for cQED with flux qubits
• Above 99.9% Fidelity Single-Qubit Gates, Two-Qubit Gates, and Readout in a Single Superconducting Quantum Device
• Resource-Efficient Cross-Platform Verification with Modular Superconducting Devices
• Optimization Framework for Reducing Mid-circuit Measurements and Resets
• Full control of superconducting qubits with combined on-chip microwave and flux lines
• Dynamics of measurement-induced state transitions in superconducting qubits
• Speeding Up Quantum Measurement Using Space-Time Trade-Off
• Mitigation of correlated readout errors without randomized measurements
• Detector of microwave photon pairs based on a Josephson photomultiplier
• Multimode Purcell Filter for Superconducting-Qubit Reset and Readout with Intrinsic Purcell Protection
• Flexible Readout and Unconditional Reset for Superconducting Multi-Qubit Processors with Tunable Purcell Filters
• Qubit Readout Error Mitigation with Bit-flip Averaging
• Modeling Josephson traveling-wave parametric amplifiers with electromagnetic and circuit co-simulation
• Measurement and control of a superconducting quantum processor with a fully-integrated radio-frequency system on a chip
• Model Order Reduction for Open Quantum Systems Based on Measurement-adapted Time-coarse Graining
• Overhead in Quantum Circuits with Time-Multiplexed Qubit Control
• Dispersive Qubit Readout with Intrinsic Resonator Reset
• Mitigating Measurement Crosstalk via Pulse Shaping
• DC-powered broadband quantum-limited microwave amplifier
• Optimizing the frequency positioning of tunable couplers in a circuit QED processor to mitigate spectator effects on quantum operations
• Mitigating errors in state preparation and measurement with noncomputational states
• Review of Superconducting Qubit Devices and Their Large-Scale Integration
• A method for the numerical analysis of hybrid lumped-distributed superconducting quantum circuits
• Exploring the Fidelity of Flux Qubit Measurement in Different Bases via the Quantum Flux Parametron
• Diagnosing crosstalk in large-scale QPUs using zero-entropy classical shadows
• Low-rank optimal control of quantum devices
• Improving the accuracy of circuit quantization using the electromagnetic properties of superconductors
• Measurement-and Feedback-Driven Non-Equilibrium Phase Transitions on a Quantum Processor