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Media from: Single-photon transmitter could enable new quantum devices

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Quantum cloud
An artist's conception shows how any number of incoming photons (top) can be absorbed by a cloud of ultra-cold atoms (center), tuned so that only one single photon can pass through at a time. Being able to produce a controlled beam of single photons has been a goal of research toward creating quantum devices.
Graphic: Christine Daniloff
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