An entangled state of two spin qubits in silicon has been prepared and measured, yielding a violation of Bell's inequality that is the largest achieved in the solid state so far.
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Coppersmith, S. Violation of Bell's inequality in Si. Nature Nanotech 11, 216–217 (2016). https://doi.org/10.1038/nnano.2016.26
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DOI: https://doi.org/10.1038/nnano.2016.26
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