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Measure in circles

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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Fig. 1: Linear and SU(1,1) interferometry.


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Correspondence to Monika Schleier-Smith.

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Kunkel, P., Schleier-Smith, M. Measure in circles. Nat. Phys. 18, 124–125 (2022).

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