Measuring central-spin interaction with a spin bath by pulsed ENDOR: Towards suppression of spin diffusion decoherence

Abstract

We present pulsed electron-nuclear double resonance (ENDOR) experiments which enable us to characterize the coupling between bismuth donor spin qubits in Si and the surrounding spin bath of 29Si impurities which provides the dominant decoherence mechanism (nuclear spin diffusion) at low temperatures (< 16 K). Decoupling from the spin bath is predicted and cluster correlation expansion simulations show near-complete suppression of spin diffusion, at optimal working points. The suppression takes the form of sharply peaked divergences of the spin diffusion coherence time, in contrast with previously identified broader regions of insensitivity to classical fluctuations. ENDOR data suggest that anisotropic contributions are comparatively weak, so the form of the divergences is largely independent of crystal orientation.

Added journal ref., minor improvements

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Cited by in corpus (10)

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• Quantum many-body theory for electron spin decoherence in nanoscale nuclear spin baths
• Converting a real quantum bath to an effective classical noise
• Quantum bath-driven decoherence of mixed spin systems
• Decoherence mechanisms of 209Bi donor electron spins in isotopically pure 28Si
• The classical nature of nuclear spin noise near clock transitions of Bi donors in silicon
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• Cluster-correlation expansion for studying decoherence of clock transitions in spin baths
• Keeping a spin qubit alive in natural silicon: Comparing optimal working points and dynamical decoupling