Extracting a single photon from a light pulse is deceptively complicated to accomplish. Now, a deterministic experimental implementation of photon subtraction could bring a host of opportunities in quantum information technology.
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Bajcsy, M., Majumdar, A. Arithmetic with photons. Nature Photon 10, 4–6 (2016). https://doi.org/10.1038/nphoton.2015.253
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DOI: https://doi.org/10.1038/nphoton.2015.253
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