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fluorescence resonance

The left diagram represents electromagnetic activity with light at the lowest level possible according to the laws of classical physics. On the right, part of the electromagnetic field has been reduced even further. The price is the inability to measure the beam of light. This effect is called "squeezing" (like squeezing juice from an orange) due to the elliptical shape it creates. Illustration: Mete Atature, University of Cambridge.

Scientists "squeezed" a beam of light - photon after photon

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