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Optical metrology

A gentle touch

Light is an excellent tool for making precise measurements of objects, but can sometimes alter or damage a sensitive sample. Researchers have now shown that entanglement and quantum-correlated light can be used to help alleviate this problem.

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Figure 1: Wolfgramm et al.'s set-up that uses a two-photon NOON state.

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Correspondence to Geoff J. Pryde.

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Pryde, G. A gentle touch. Nature Photon 7, 8–9 (2013). https://doi.org/10.1038/nphoton.2012.333

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