The ability to distinguish how many photons comprise a particular state of light leads to significant benefits in practical quantum information processing and quantum cryptography. Superconducting nanostructures provide an effective solution at telecom wavelengths.
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Sergienko, A. Beyond single-photon counting. Nature Photon 2, 268–269 (2008). https://doi.org/10.1038/nphoton.2008.59
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DOI: https://doi.org/10.1038/nphoton.2008.59
