Dark exciton condensate in coupled quantum wells polarizes nuclei far from the excitation spot and for seconds afterward, with hyperfine coupling enhanced 100x via proposed collective sqrt(N) amplification.
Kubo et al., Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble
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Giant Hyperfine Interaction between a Dark Exciton Condensate and Nuclei
Dark exciton condensate in coupled quantum wells polarizes nuclei far from the excitation spot and for seconds afterward, with hyperfine coupling enhanced 100x via proposed collective sqrt(N) amplification.