Strong coupling between a mechanical oscillator and the spin of an electron could enable cooling of the oscillator to its quantum ground state and measurement of the zero-point fluctuations.
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Wrachtrup, J. Schrödinger's cat is still alive. Nature Phys 5, 248–249 (2009). https://doi.org/10.1038/nphys1245
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DOI: https://doi.org/10.1038/nphys1245
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