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Quantum optics

Photons yield to peer pressure

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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Figure 1: In quantum mechanics, one plus one can equal zero, or four.

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Correspondence to Paul Kwiat.

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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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