A sample-half-inserted Hong-Ou-Mandel interferometer converts the usual artifact fringe into a high-Fisher-information signal and measures optical path changes of a few nanometers with O(10^7) photons.
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Sample-half-inserted quantum interferometer
A sample-half-inserted Hong-Ou-Mandel interferometer converts the usual artifact fringe into a high-Fisher-information signal and measures optical path changes of a few nanometers with O(10^7) photons.