Quantum bath-driven decoherence of mixed spin systems

Abstract

The decoherence of mixed electron-nuclear spin qubits is a topic of great current importance, but understanding is still lacking: while important decoherence mechanisms for spin qubits arise from quantum spin bath environments with slow decay of correlations, the only analytical framework for explaining observed sharp variations of decoherence times with magnetic field is based on the suppression of classical noise. Here we obtain a general expression for decoherence times of the central spin system which exposes significant differences between quantum-bath decoherence and decoherence by classical field noise. We perform measurements of decoherence times of bismuth donors in natural silicon using both electron spin resonance (ESR) and nuclear magnetic resonance (NMR) transitions, and in both cases find excellent agreement with our theory across a wide parameter range. The universality of our expression is also tested by quantitative comparisons with previous measurements of decoherence around `optimal working points' or `clock transitions' where decoherence is strongly suppressed. We further validate our results by comparison to cluster expansion simulations.

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Cited by in corpus (25)

• Quantum decoherence dynamics of divacancy spins in silicon carbide
• Quantum many-body theory for electron spin decoherence in nanoscale nuclear spin baths
• Environmental noise spectroscopy with qubits subjected to dynamical decoupling
• Electrically driven optical interferometry with spins in silicon carbide
• Learning models of quantum systems from experiments
• Probing the coherence of solid-state qubits at avoided crossings
• Dynamical decoupling noise spectroscopy at an optimal working point of a qubit
• Dynamical decoupling based quantum sensing: Floquet spectroscopy
• The classical nature of nuclear spin noise near clock transitions of Bi donors in silicon
• Longitudinal spin relaxation model applied to point defect qubit systems
• Rabi oscillations, decoherence, and disentanglement in a qubit-spin-bath system: exact dynamics
• Dynamics of entanglement of two electron spins interacting with nuclear spin baths in quantum dots
• Decoherence of nuclear spins in the "frozen core" of an electron spin
• Discovery of Atomic Clock-Like Spin Defects in Simple Oxides from First Principles
• Substrate-controlled dynamics of spin qubits in low dimensional van-der-Waals materials
• Unconventional field-induced spin gap in an $S=1/2$ chiral staggered chain
• Cluster-correlation expansion for studying decoherence of clock transitions in spin baths
• Decoherence of Nuclear Spins in the Proximity of Nitrogen Vacancy Centers in Diamond
• Keeping a spin qubit alive in natural silicon: Comparing optimal working points and dynamical decoupling
• Qubit guidelines for solid-state spin defects
• Generalized scaling of spin qubit coherence in over 12,000 host materials
• First-principles computational methods for quantum defects in two-dimensional materials: A perspective
• Numerically exact quantum dynamics with tensor networks: Predicting the decoherence of interacting spin systems
• Simulating decoherence of two coupled spins using the generalized cluster correlation expansion
• PyCCE: A Python Package for Cluster Correlation Expansion Simulations of Spin Qubit Dynamic