The full quantum description of an optical detector not only reveals how it operates at the most fundamental level but also promises new opportunities in quantum information processing.
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Zavatta, A., Bellini, M. The quantum picture of a detector. Nature Photon 6, 350–351 (2012). https://doi.org/10.1038/nphoton.2012.120
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DOI: https://doi.org/10.1038/nphoton.2012.120