Astronomers crave a detector sensitive enough to detect a single photon and determine its energy. A new single-pixel device can do this, and could also be built up into a large array suitable for a telescope.
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Prober, D. To catch a photon. Nature 425, 777–778 (2003). https://doi.org/10.1038/425777a
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DOI: https://doi.org/10.1038/425777a
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