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Hyperfine interactions with a nuclear spin environment fundamentally limitthe coherence properties of confined electron spins in the solid-state. Here,we show that a quantum interference effect in optical absorption from twoelectronic spin states of a solid-state emitter can be used to prepare thesurrounding environment of nuclear spins in well-defined states, therebysuppressing electronic spin dephasing. The evolution of the coupledelectron-nuclei system into a coherent population trapping state by opticalexcitation induced nuclear spin diffusion can be described in terms of Levyflights, in close analogy with sub-recoil laser cooling of atoms. The largedifference in electronic and nuclear time scales simultaneously allow for ameasurement of the magnetic field produced by nuclear spins, making it possibleto turn the lasers that cause the anomalous spin diffusion process off when thestrength of the resonance fluorescence reveals that the nuclear spins are inthe desired narrow state.

Nuclear spin cooling using Overhauser field selective coherent population trapping