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Quantum optics

Quantum optics

Photons with half-integer angular momentum are the latest twist on light

16 May 2016
Illustration of twisted light with half-integer angular momentum
Half-twists: light with half-integer angular momentum. (Courtesy: John Donegan/Trinity College Dublin)
Photons can have half-integer values of angular momentum when they are confined to fewer than three

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Edwin Cartlidge is a science writer based in Rome
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