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Quantum optics

Quantum optics

Photons stay entangled despite huge jump in frequency

14 May 2022
Diagram showing a red waveform entering a fibre, interacting with molecules represented by ball-and-stick models, and coming out as a blue waveform
Up-conversion: the new scheme converts single photons from a lower frequency to a higher one by scattering them off a moving refractive index grating created by molecular vibrations in an optical fibre filled with hydrogen gas. (Courtesy: Nicholas Joly)
A new technique that keeps two photons entangled while greatly increasing the frequency of one of th

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Tim Wogan is a science writer based in the US
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