Narrowing of the Overhauser field distribution by feedback-enhanced dynamic nuclear polarization

Abstract

In many electron spin qubit systems coherent control is impaired by the fluctuating nuclear spin bath of the host material. Previous experiments have shown dynamic nuclear polarization with feedback to significantly prolong the inhomogeneous dephasing time $T_2^{\ast }$ by narrowing the distribution of nuclear Overhauser field fluctuations. We present a model relating the achievable narrowing of the Overhauser field to both the pump rate and the noise magnitude and find reasonable agreement with experimental data. It shows that former experiments on gated GaAs quantum dots were limited by the pump rate of the pumping mechanism used. Here we propose an alternative feedback scheme using electron dipole spin resonance. Sequentially applying two ac electric fields with frequencies slightly detuned from the desired Larmor frequency results in a pump curve with a stable fixed point. Our model predicts that $T_2^{\ast }$ values on the order of microseconds can be achieved.

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References in corpus (16)

• Driven coherent oscillations of a single electron spin in a quantum dot
• Coherent control of a single electron spin with electric fields
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Nuclear spin physics in quantum dots: an optical investigation
• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
• Suppressing qubit dephasing using real-time Hamiltonian estimation
• Hyperfine-mediated gate-driven electron spin resonance
• Dynamic Nuclear Polarization with Single Electron Spins
• Measurement of Temporal Correlations of the Overhauser Field in a Double Quantum Dot
• Large nuclear Overhauser fields detected in vertically-coupled double quantum dots
• Nonperturbative master equation solution of central spin dephasing dynamics
• Theory of electric dipole spin resonance in quantum dots: Mean field theory with Gaussian fluctuations and beyond
• Electrically-Driven Reverse Overhauser Pumping of Nuclear Spins in Quantum Dots
• Wavefunction considerations for the central spin decoherence problem in a nuclear spin bath
• Theory of dynamic nuclear polarization and feedback in quantum dots

Cited by in corpus (8)

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• Measurement of back-action from electron spins in a gate defined GaAs double quantum dot coupled to a mesoscopic nuclear spin bath
• Feedback-tuned noise-resilient gates for encoded spin qubits
• Dynamic nuclear spin polarization induced by Edelstein effect at Bi(111) surfaces
• Electron spin-flip correlations due to nuclear dynamics in driven GaAs double dots
• Dynamical nuclear spin polarization in a quantum dot with an electron spin driven by electric dipole spin resonance
• Extending Qubit Coherence Time via Hybrid Dynamical Decoupling