Spontaneous formation of a macroscopically extended coherent state
2020
The authors show superfluorescent emission by a large ensemble of ions ($\ensuremath{\sim}$\,10^12) embedded in a rare earth doped crystal. The paper shows how the spontaneous formation of a single macroscopic dipole takes place, triggered by excited ions coherently interacting via a common light field and initiated by the vacuum fluctuations.
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