Quantum effects have been used in devices that measure various quantities, but not to measure electric fields. The sensitivity of an electrometer has now been boosted using the phenomenon of quantum superposition. See Letter p.262
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Adams, C. Schrödinger's cat beats a quantum limit. Nature 535, 238–239 (2016). https://doi.org/10.1038/535238a
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DOI: https://doi.org/10.1038/535238a
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