Sentences with phrase «velocity of single photons»
We study the group velocity of single photons by measuring a change in their arrival time that results from changing the beam's transverse spatial structure.
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If an atom absorbs a single photon, its change in velocity is tiny compared with the average velocity of atoms in a gas at room temperature.
Going beyond optical molasses, Cohen - Tannoudji, Alain Aspect, Ennio Arimondo, Robin Kaiser and Nathalie Vansteenkiste, then all at the Ecole Normale, invented an ingenious scheme capable of cooling helium atoms below the recoil velocity of a single scattered photon.