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Metrology

Schrödinger's cat beats a quantum limit

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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Figure 1: Quantum effects increase sensitivity in an atomic electrometer.

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Correspondence to Charles S. Adams.

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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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