A d-path balanced multiport interferometer achieves the exact one-shot optimum (d−1)^2/d^3 for locating one absorber among d paths without absorbing the photon.
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Optimal Interaction Free Localization with Multipath Interferometers
A d-path balanced multiport interferometer achieves the exact one-shot optimum (d−1)^2/d^3 for locating one absorber among d paths without absorbing the photon.