Entanglement can provide an extra boost in precision, but entangled states are hard to detect. A recent experiment solves this problem by letting the entangling dynamics come full circle — or not, depending on the subtle perturbation to be sensed.
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Kunkel, P., Schleier-Smith, M. Measure in circles. Nat. Phys. 18, 124–125 (2022). https://doi.org/10.1038/s41567-021-01500-z
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DOI: https://doi.org/10.1038/s41567-021-01500-z
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