Scalable High-Performance Fluxonium Quantum Processor

Abstract

The technological development of hardware heading toward universal fault-tolerant quantum computation requires a large-scale processing unit with high performance. While fluxonium qubits are promising with high coherence and large anharmonicity, their scalability has not been systematically explored. In this work, we propose a superconducting quantum information processor based on compact high-coherence fluxoniums with suppressed crosstalk, reduced design complexity, improved operational efficiency, high-fidelity gates, and resistance to parameter fluctuations. In this architecture, the qubits are readout dispersively using individual resonators connected to a common bus and manipulated via combined on-chip RF and DC control lines, both of which can be designed to have low crosstalk. A multi-path coupling approach enables exchange interactions between the high-coherence computational states and at the same time suppresses the spurious static ZZ rate, leading to fast and high-fidelity entangling gates. We numerically investigate the cross resonance controlled-NOT and the differential AC-Stark controlled-Z operations, revealing low gate error for qubit-qubit detuning bandwidth of up to 1 GHz. Our study on frequency crowding indicates high fabrication yield for quantum processors consisting of over thousands of qubits. In addition, we estimate low resource overhead to suppress logical error rate using the XZZX surface code. These results promise a scalable quantum architecture with high performance for the pursuit of universal quantum computation.

arXiv comment29 pages, 15 figures

References in corpus (193)

• Quantum Computing in the NISQ era and beyond
• Fault-tolerant quantum computation by anyons
• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Quantum Machine Learning
• Charge insensitive qubit design derived from the Cooper pair box
• Surface codes: Towards practical large-scale quantum computation
• Hardware-efficient Variational Quantum Eigensolver for Small Molecules and Quantum Magnets
• QuTiP 2: A Python framework for the dynamics of open quantum systems
• QuTiP: An open-source Python framework for the dynamics of open quantum systems
• Circuit Quantum Electrodynamics
• A Quantum Engineer's Guide to Superconducting Qubits
• Topological quantum memory
• Coupling Superconducting Qubits via a Cavity Bus
• Quantum Error Correction for Quantum Memories
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Strong quantum computational advantage using a superconducting quantum processor
• Quantum algorithms: an overview
• Reliable Quantum Computers
• Extending the computational reach of a noisy superconducting quantum processor
• Quantum Computational Supremacy
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• Fluxonium: single Cooper pair circuit free of charge offsets
• A Superconducting Persistent Current Qubit
• Quantum information processing with circuit quantum electrodynamics
• Hartree-Fock on a superconducting qubit quantum computer
• Realizing Repeated Quantum Error Correction in a Distance-Three Surface Code
• Roads towards fault-tolerant universal quantum computation
• Superconducting qubit in waveguide cavity with coherence time approaching 0.1ms
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Qubit architecture with high coherence and fast tunable coupling
• Quantum Simulators: Architectures and Opportunities
• Efficient Z-Gates for Quantum Computing
• Controlling the spontaneous emission of a superconducting transmon qubit
• High threshold universal quantum computation on the surface code
• AC-Stark Shift and Dephasing of a Superconducting Qubit Strongly Coupled to a Cavity Field
• Procedure for systematically tuning up crosstalk in the cross resonance gate
• Digitized adiabatic quantum computing with a superconducting circuit
• A simple all-microwave entangling gate for fixed-frequency superconducting qubits
• Robust determination of molecular spectra on a quantum processor
• The Kerr-Cat Qubit: Stabilization, Readout, and Gates
• Fast Scalable State Measurement with Superconducting Qubits
• Quantum error correction of a qubit encoded in grid states of an oscillator
• Quantum Simulation of Electronic Structure with Linear Depth and Connectivity
• A tunable coupling scheme for implementing high-fidelity two-qubit gates
• Exponential suppression of bit or phase flip errors with repetitive error correction
• Demonstration of qubit operations below a rigorous fault tolerance threshold with gate set tomography
• Complete universal quantum gate set approaching fault-tolerant thresholds with superconducting qubits
• Observation of Time-Crystalline Eigenstate Order on a Quantum Processor
• Quantum computing with nearest neighbor interactions and error rates over 1%
• Repeated Quantum Error Detection in a Surface Code
• Realizing Rapid, High-Fidelity, Single-Shot Dispersive Readout of Superconducting Qubits
• Resilient Quantum Computation: Error Models and Thresholds
• Realization of an Error-Correcting Surface Code with Superconducting Qubits
• Fidelity of quantum operations
• Second order gradient ascent pulse engineering
• Demonstration of quantum error correction and universal gate set on a binomial bosonic logical qubit
• Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit
• Rapid high-fidelity multiplexed readout of superconducting qubits
• Analytic control methods for high fidelity unitary operations in a weakly nonlinear oscillator
• Dispersive magnetometry with a quantum limited SQUID parametric amplifier
• Measuring and Suppressing Quantum State Leakage in a Superconducting Qubit
• Quantum Information Scrambling in a Superconducting Qutrit Processor
• 3D integrated superconducting qubits
• Correlated Charge Noise and Relaxation Errors in Superconducting Qubits
• Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
• The XZZX Surface Code
• Digital quantum simulation of spin models with circuit quantum electrodynamics
• The high-coherence fluxonium qubit
• Error-mitigated digital quantum simulation
• Optimal quantum control using randomized benchmarking
• Relaxation and frequency shifts induced by quasiparticles in superconducting qubits
• Measurement and Control of Quasiparticle Dynamics in a Superconducting Qubit
• Implementation of low-loss superinductances for quantum circuits
• Impact of ionizing radiation on superconducting qubit coherence
• Cavity-assisted quantum bath engineering
• Hot non-equilibrium quasiparticles in transmon qubits
• Granular aluminum: A superconducting material for high impedance quantum circuits
• Implementing optimal control pulse shaping for improved single-qubit gates
• Process verification of two-qubit quantum gates by randomized benchmarking
• Fast and Unconditional All-Microwave Reset of a Superconducting Qubit
• Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
• Towards practical classical processing for the surface code
• Detecting crosstalk errors in quantum information processors
• Protected gates for superconducting qubits
• Resolving catastrophic error bursts from cosmic rays in large arrays of superconducting qubits
• Effective Hamiltonian models of the cross-resonance gate
• Feedback control of a solid-state qubit using high-fidelity projective measurement
• Superconducting Nanocircuits for Topologically Protected Qubits
• Tailoring quantum gases by Floquet engineering
• Quasiparticle dynamics in granular aluminum close to the superconductor to insulator transition
• Heralded state preparation in a superconducting qubit
• Topological and subsystem codes on low-degree graphs with flag qubits
• Initialization by measurement of a two-qubit superconducting circuit
• Microwave-induced coupling of superconducting qubits
• Quasiparticle relaxation of superconducting qubits in the presence of flux
• Reducing the impact of radioactivity on quantum circuits in a deep-underground facility
• Circuit Quantum Electrodynamics of Granular Aluminum Resonators
• Experimental realization of an intrinsically error-protected superconducting qubit
• Protecting a Bosonic Qubit with Autonomous Quantum Error Correction
• Fluxonium: an alternative qubit platform for high-fidelity operations
• Entanglement of two superconducting qubits in a waveguide cavity via monochromatic two-photon excitation
• Suppression of photon shot noise dephasing in a tunable coupling superconducting qubit
• Suppressing relaxation in superconducting qubits by quasiparticle pumping
• Experimental demonstration of a resonator-induced phase gate in a multi-qubit circuit QED system
• Non-Poissonian Quantum Jumps of a Fluxonium Qubit due to Quasiparticle Excitations
• Logical-qubit operations in an error-detecting surface code
• Reducing unitary and spectator errors in cross resonance with optimized rotary echoes
• First-principles analysis of cross-resonance gate operation
• Possible realization of an ideal quantum computer in Josephson junction array
• High Kinetic Inductance NbN Nanowire Superinductors
• Microwave-activated conditional-phase gate for superconducting qubits
• Machine learning for discriminating quantum measurement trajectories and improving readout
• Reduced phase error through optimized control of a superconducting qubit
• Evidence for coherent quantum phase-slips across a Josephson junction array
• Circuit QED with fluxonium qubits: theory of the dispersive regime
• Comparing Experiments to the Fault-Tolerance Threshold
• Universal fast flux control of a coherent, low-frequency qubit
• Realization of a $\Lambda$ system with metastable states of a capacitively-shunted fluxonium
• Improving wafer-scale Josephson junction resistance variation in superconducting quantum coherent circuits
• Charging effects in the inductively shunted Josephson junction
• Persistent control of a superconducting qubit by stroboscopic measurement feedback
• Quantum theory of a bandpass Purcell filter for qubit readout
• Digital Quantum Simulation of Spin Systems in Superconducting Circuits
• Nonreciprocity realized with quantum nonlinearity
• Measurement of the effect of quantum phase-slips in a Josephson Junction chain
• Nanowire Superinductance Fluxonium Qubit
• Identifying optimal cycles in quantum thermal machines with reinforcement-learning
• Selective darkening of degenerate transitions demonstrated with two superconducting quantum bits
• Distinguishing coherent and thermal photon noise in a circuit QED system
• Protecting a superconducting qubit from energy decay by selection rule engineering
• Trapping a single vortex and reducing quasiparticles in a superconducting resonator
• Operation and intrinsic error budget of a two-qubit cross-resonance gate
• High-fidelity three-qubit iToffoli gate for fixed-frequency superconducting qubits
• Novel E-beam lithography technique for in-situ junction fabrication: the controlled undercut
• Microwave attenuators for use with quantum devices below 100 mK
• Superconducting circuit protected by two-Cooper-pair tunneling
• Direct Dispersive Monitoring of Charge Parity in Offset-Charge-Sensitive Transmons
• Phonon traps reduce the quasiparticle density in superconducting circuits
• Building Blocks of a Flip-Chip Integrated Superconducting Quantum Processor
• Atomic layer deposition of titanium nitride for quantum circuits
• Non-Markovian Quantum Process Tomography
• Circuit quantization in the presence of time-dependent external flux
• Multiplexed dispersive readout of superconducting phase qubits
• Simplified Josephson-junction fabrication process for reproducibly high-performance superconducting qubits
• Coherence properties of the 0-$\pi$ qubit
• Protected Josephson Rhombi Chains
• Hardware-Efficient Microwave-Activated Tunable Coupling Between Superconducting Qubits
• Interplay between kinetic inductance, non-linearity and quasiparticle dynamics in granular aluminum MKIDs
• Topological order in the insulating Josephson junction array
• Bifluxon: Fluxon-Parity-Protected Superconducting Qubit
• Wirebond crosstalk and cavity modes in large chip mounts for superconducting qubits
• Microwave Package Design for Superconducting Quantum Processors
• Broadband Filters for Abatement of Spontaneous Emission in Circuit Quantum Electrodynamics
• Low-Latency Digital Signal Processing for Feedback and Feedforward in Quantum Computing and Communication
• Accurately computing electronic properties of a quantum ring
• Fast logic with slow qubits: microwave-activated controlled-Z gate on low-frequency fluxoniums
• Photon-assisted charge-parity jumps in a superconducting qubit
• Environmental Radiation Impact on Lifetimes and Quasiparticle Tunneling Rates of Fixed-Frequency Transmon Qubits
• Engineering Dynamical Sweet Spots to Protect Qubits from 1/$f$ Noise
• Leakage detection for a transmon-based surface code
• Quantum electrodynamics of a superconductor-insulator phase transition
• Mitigation of Cosmic Ray Effect on Microwave Kinetic Inductance Detector Arrays
• Breaking time-reversal symmetry with a superconducting flux capacitor
• Fast parametric two-qubit gates with suppressed residual interaction using a parity-violated superconducting qubit
• Surpassing the resistance quantum with a geometric superinductor
• Optimized cross-resonance gate for coupled transmon systems
• Pulse-level noisy quantum circuits with QuTiP
• Quantization of inductively-shunted superconducting circuits
• Understanding degenerate ground states of a protected quantum circuit in the presence of disorder
• Demonstration of an All-Microwave Controlled-Phase Gate between Far Detuned Qubits
• A fluxonium-based artificial molecule with a tunable magnetic moment
• Using deep learning to understand and mitigate the qubit noise environment
• Quantum non-demolition dispersive readout of a superconducting artificial atom using large photon numbers
• Optimizing frequency allocation for fixed-frequency superconducting quantum processors
• Granular Aluminum Meandered Superinductors for Quantum Circuits
• Simulating and mitigating crosstalk
• Microwave-Activated Controlled-Z Gate for Fixed-Frequency Fluxonium Qubits
• Control and Coherence Time Enhancement of the 0-$\pi$ Qubit
• Local Sensing with the Multi-Level AC Stark Effect
• A low-noise on-chip coherent microwave source
• Gyrator operation using Josephson mixers
• Geometric superinductance qubits: Controlling phase delocalization across a single Josephson junction
• Breaking the trade-off between fast control and long lifetime of a superconducting qubit
• Collective modes in the fluxonium qubit
• Magnifying quantum phase fluctuations with Cooper-pair pairing
• Selective darkening of degenerate transitions for implementing quantum controlled-NOT gates
• Proposal for entangling gates on fluxonium qubits via a two-photon transition
• Operating in a deep underground facility improves the locking of gradiometric fluxonium qubits at the sweet spots
• Superconducting coupler with exponentially large on-off ratio
• Operating a passive on-chip superconducting circulator: device control and quasiparticle effects
• Minimizing the discrimination time for quantum states of an artificial atom
• Hot electron heatsinks for microwave attenuators below 100 mK
• Combining $T_1$ and $T_2$ estimation with randomized benchmarking and bounding the diamond distance

Cited by in corpus (50)

• High-Fidelity, Frequency-Flexible Two-Qubit Fluxonium Gates with a Transmon Coupler
• Observation of Josephson Harmonics in Tunnel Junctions
• Programmable Heisenberg interactions between Floquet qubits
• Optimizing quantum gates towards the scale of logical qubits
• Effects of Laser-Annealing on Fixed-Frequency Superconducting Qubits
• Photon-noise-tolerant dispersive readout of a superconducting qubit using a nonlinear Purcell filter
• Observation of higher-order topological states on a quantum computer
• Fast high-fidelity gates for galvanically-coupled fluxonium qubits using strong flux modulation
• Consistent Quantization of Nearly Singular Superconducting Circuits
• Qudit Dynamical Decoupling on a Superconducting Quantum Processor
• Multi-mode architectures for noise-resilient superconducting qubits
• Fast and Robust Geometric Two-Qubit Gates for Superconducting Qubits and beyond
• A Practical Introduction to Benchmarking and Characterization of Quantum Computers
• Native approach to controlled-Z gates in inductively coupled fluxonium qubits
• Blueprint for all-to-all connected superconducting spin qubits
• CNOT gates for fluxonium qubits via selective darkening of transitions
• High coherence fluxonium manufactured with a wafer-scale uniformity process
• Speeding up qubit control with bipolar single-flux-quantum pulse sequences
• Fast Flux Entangling Gate for Fluxonium Circuits
• Gatemonium: A Voltage-Tunable Fluxonium
• Measurement-induced state transitions in dispersive qubit readout schemes
• SQ-CARS: A Scalable Quantum Control and Readout System
• Microwave-activated gates between a fluxonium and a transmon qubit
• Flux-pulse-assisted Readout of a Fluxonium Qubit
• Impact of Josephson junction array modes on fluxonium readout
• Hybrid cat-transmon architecture for scalable, hardware-efficient quantum error correction
• Numerical circuit synthesis and compilation for multi-state preparation
• Tunneling of fluxons via a Josephson resonant level
• Single-Qubit Gates Beyond the Rotating-Wave Approximation for Strongly Anharmonic Low-Frequency Qubits
• Verifying the analogy between transversely coupled spin-1/2 systems and inductively-coupled fluxoniums
• Sub-Harmonic Control of a Fluxonium Qubit via a Purcell-Protected Flux Line
• The quartic Blochnium: an anharmonic quasicharge superconducting qubit
• Frozonium: Freezing Anharmonicity in Floquet Superconducting Circuits
• SuperGrad: a differentiable simulator for superconducting processors
• Manipulation of magnetic systems by quantized surface acoustic wave via piezomagnetic effect
• Cross-resonance control of an oscillator with an auxiliary fluxonium qubit
• Viewing protected superconducting qubits through the lens of the cat qubit
• Transmon-assisted high-fidelity controlled-Z gates for integer fluxonium qubits
• Non-demolition fluorescence readout and high-fidelity unconditional reset of a fluxonium qubit via dissipation engineering
• Simultaneous sweet-spot locking of gradiometric fluxonium qubits
• Flux-Trapping Fluxonium Qubit
• High Impedance Granular Aluminum Ring Resonators
• Kicked fluxonium with quantum strange attractor
• Scalable Low-overhead Superconducting Non-local Coupler with Exponentially Enhanced Connectivity
• Microwave-activated high-fidelity three-qubit gate scheme for fixed-frequency superconducting qubits
• Engineering squeezed thermal reservoirs via passive linear coupling
• A fluxonium qubit-based hybrid electromechanical system
• Robust multi-mode superconducting circuit optimized for quantum information processing
• Exact amplitudes of parametric processes in driven Josephson circuits
• Proposal for erasure conversion in integer fluxonium qubits