In 1960 the invention of the laser allowed classical light to be amplified inside a cavity. New experiments show that photons in a special quantum state can also be amplified.
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Kwiat, P. Photons yield to peer pressure. Nature 412, 866–867 (2001). https://doi.org/10.1038/35091173
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DOI: https://doi.org/10.1038/35091173