Dynamical decoupling and noise spectroscopy with a superconducting flux qubit

Abstract

The characterization and mitigation of decoherence in natural and artificial two-level systems (qubits) is fundamental to quantum information science and its applications. Decoherence of a quantum superposition state arises from the interaction between the constituent system and the uncontrolled degrees of freedom in its environment. Within the standard Bloch-Redfield picture of two-level system dynamics, qubit decoherence is characterized by two rates: a longitudinal relaxation rate Gamma1 due to the exchange of energy with the environment, and a transverse relaxation rate Gamma2 = Gamma1/2 + Gamma_phi which contains the pure dephasing rate Gamma_phi. Irreversible energy relaxation can only be mitigated by reducing the amount of environmental noise, reducing the qubit's internal sensitivity to that noise, or through multi-qubit encoding and error correction protocols (which already presume ultra-low error rates). In contrast, dephasing is in principle reversible and can be refocused dynamically through the application of coherent control pulse methods. In this work we demonstrate how dynamical-decoupling techniques can moderate the dephasing effects of low-frequency noise on a superconducting qubit with energy-relaxation time T1 = 1/Gamma1 = 12 us. Using the CPMG sequence with up to 200 pi-pulses, we demonstrate a 50-fold improvement in the transverse relaxation time T2 over its baseline value. We observe relaxation-limited times T2(CPMG) = 23 us = 2 T1 resulting from CPMG-mediated Gaussian pure-dephasing times in apparent excess of 100 us. We leverage the filtering property of this sequence in conjunction with Rabi and energy relaxation measurements to facilitate the spectroscopy and reconstruction of the environmental noise power spectral density.

21 pages (incl. 11-page appendix); 4 (+7) figures

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• Achieving Heisenberg limit under General Markov Noise without Ancilla
• Coherence of a dynamically decoupled single neutral atom
• The role of master clock stability in scalable quantum information processing
• Maximizing information obtainable by quantum sensors through the Quantum Zeno Effect
• Sensing Out-of-Equilibrium and Quantum Non-Gaussian environments via induced Time-Reversal Symmetry Breaking on the quantum-probe dynamics
• Efficient Chromatic-Number-Based Multi-Qubit Decoherence and Crosstalk Suppression
• Stabilizing an individual charge fluctuator in a Si/SiGe quantum dot
• Engineering Bosonic Codes with Quantum Lattice Gates
• Telegraph flux noise induced beating Ramsey fringe in transmon qubits
• Dark-state photonic entanglement filters
• Synchronization for Fault-Tolerant Quantum Computers
• Flux noise in disordered spin systems
• Protection of quantum information in a chain of Josephson junctions
• Suppressing the geometric dephasing of Berry phase by using modified dynamical decoupling sequences
• Effects of stochastic noise on dynamical decoupling procedures
• Dynamics of an ultra-strongly-coupled system interacting with a driven nonlinear resonator
• Ghost factors in Gauss-sum factorization with transmon qubits
• Two-mode squeezing operator in circuit QED
• Role of the filter functions in noise spectroscopy
• Spin manipulation and spin dephasing in quantum dot integrated with a slanting magnetic field
• Noise suppression and long-range exchange coupling for gallium arsenide spin qubits
• A functional basis for efficient physical-layer classical control in quantum processors
• Characterizing the magnetic noise power spectrum of dark spins in diamond
• Wavelet correlation noise analysis for qubit operation variable time series
• Consistent perturbative treatment of the subohmic spin-boson model yielding arbitrarily small $T_2/T_1$ decoherence time ratios
• Gate-Based Initialization and Fidelity in Correlated Open Quantum Systems
• Invariance of success probability in Grover's quantum search under local noise with memory
• Learning the noise fingerprint of quantum devices
• Detection of the phase shift of an alternating-current magnetic field by quantum sensing with multiple-pulse decoupling sequences
• Optical nuclear electric resonance as single qubit gate for trapped neutral atoms
• Spectrum analysis with parametrically modulated transmon qubits
• Spectroscopy of composite solid-state spin environments for improved metrology with spin ensembles
• Linear response theory of Josephson junction arrays in a microwave cavity
• Coherent interaction-free detection of noise
• Decoherence of a tunable capacitively shunted flux qubit
• Open-loop quantum control of small-size networks for high-order cumulants and cross-correlations sensing
• Nonclassical radiation from a nonlinear oscillator driven solely by classical $1/f$ noise
• Learning a quantum computer's capability
• Model for 1/f Flux noise in Superconducting Aluminum Devices: Impact of External Magnetic Fields
• Adiabatic quantum decoherence in many non-interacting subsystems induced by the coupling with a common boson bath
• Preparing Greenberger-Horne-Zeilinger Entangled Photon Fock States of Three Cavities Coupled by a Superconducting Flux Qutrit
• Integration of topological insulator Josephson junctions in superconducting qubit circuits
• Enhanced Quantum Signal Control and Sensing Under Multicolored Noise via Generalized Filter Function Framework
• Dual Map Framework for Noise Characterization of Quantum Computers
• Opportunities and Limitations in Broadband Sensing
• Sparse Non-Markovian Noise Modeling of Transmon-Based Multi-Qubit Operations
• Probing Complex Decoherence Processes in Materials for Quantum Applications
• Decoherence mitigation by real-time noise acquisition
• Sensing microscopic noise events by frequent quantum measurements
• Engineering Precise and Robust Effective Hamiltonians
• Selective decoupling in multi-level quantum systems by the SU(2) sign anomaly
• Characterization of multi-level dynamics and decoherence in a high-anharmonicity capacitively shunted flux circuit
• Polarizing electron spins with a superconducting flux qubit
• Shape effects of localized losses in quantum wires: dissipative resonances and nonequilibrium universality
• Intrinsic and induced quantum quenches for enhancing qubit-based quantum noise spectroscopy
• Effect of Etching Methods on Dielectric Losses in Transmons
• Pulse-controlled quantum gate sequences on a strongly coupled qubit chain
• $T_1$-Echo Sequence - Protecting the state of a qubit in the presence of coherent interaction
• A Linear Quantum Coupler for Clean Bosonic Control
• Harnessing spin-qubit decoherence to probe strongly-interacting quantum systems
• Noise cross-correlations from single-shot measurements
• Model validation and error attribution for a drifting qubit
• Entanglement dynamics and performance of two-qubit gates for superconducting qubits under non-Markovian effects
• Expedited Noise Spectroscopy of Transmon Qubits
• Ultrastrong capacitive coupling of flux qubits
• Kramers-protected hardware-efficient error correction with Andreev spin qubits
• Dynamical sensitivity control of a single-spin quantum sensor
• Non-Markovian Noise in Symmetry-Preserving Quantum Dynamics
• Robust shaped pulses for arrays of superconducting or semiconductor spin qubits with fixed Ising coupling
• Fractional quantum fields with Le'vy paths
• Manifestation of critical effects in environmental parameter estimation using a quantum sensor under dynamical control
• Data-Driven Reconstruction and Characterization of Stochastic Dynamics via Dynamical Mode Decomposition
• Dynamics and Control of Two Coupled Quantum Oscillators: An Analytical Approach
• Measurement-and Feedback-Driven Non-Equilibrium Phase Transitions on a Quantum Processor
• Characterization and cancellation of power-line-induced motional-mode frequency noise in a trapped-ion system
• Measuring and correcting nanosecond pulse distortions in quantum-dot spin qubits
• Review of Superconducting Qubit Devices and Their Large-Scale Integration
• Quantum sensing in the fractional Fourier domain
• Qubit decoherence under two-axis coupling to low-frequency noises
• Probing the collective dynamics of nuclear spin bath in a rare-earth ion doped crystal
• Characterize noise correlation and enhance coherence via qubit motion
• Environmental effects in quantum annealing
• Robust Dynamical Decoupling for the Manipulation of a Spin Network via a Single Spin
• Nonperturbative leakage elimination for a logical qubit encoded in a mechanical oscillator
• Entanglement generation through local field and quantum dissipation
• Oscillator bath simulation of the spin bath
• Characterization and generation of a SQL-beating catlike state through repetitive measurements
• Filter Function Formalism and Software Package to Compute Quantum Processes of Gate Sequences for Classical Non-Markovian Noise
• Universal Dephasing Noise Injection via Schrodinger Wave Autoregressive Moving Average Models