An energy-entangled two-photon interferometer with a 177-THz color difference achieves about 1-nm resolution with roughly 10^4 photon pairs and measures a 7(1)-nm nickel film, robust to loss and background.
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Fast quantum interferometry at the nanometer and attosecond scales with energy-entangled photons
An energy-entangled two-photon interferometer with a 177-THz color difference achieves about 1-nm resolution with roughly 10^4 photon pairs and measures a 7(1)-nm nickel film, robust to loss and background.