The most sensitive phase-measuring instrument yet uses quantum trickery and a scaled-down version of the notorious Schrödinger's cat. It means that more sensitive devices for metrology and imaging could be on the way.
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Dowling, J. Kittens catch phase. Nature 450, 362–363 (2007). https://doi.org/10.1038/450362b
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DOI: https://doi.org/10.1038/450362b