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Electron spin qubit coherence in quantum dots is ultimately limited by randomnuclear spin bath fluctuations. Here we aim to eliminate this randomness bymaking spin bath evolution deterministic. We introduce spin bath controlsequences, which systematically combine Hahn and solid echoes to suppressinhomogeneous broadening and nuclear-nuclear interactions. Experiments onself-assembled quantum dots show a five-fold increase in nuclear spincoherence. Numerical simulations show that these sequences can be used tosuppress decoherence via qubit-qubit interaction in point defect and dopantspin systems.

nature communications

Dynamical suppression of fluctuations in an interacting nuclear spin  bath of a self-assembled quantum dot using multiple pulse nuclear magnetic  resonance