Carrying Around Light Pulses

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© Reprinted by permission from Macmillan Publishers Ltd: Nature 445, 623-626 (8 February 2007).

When the matter copy is embedded in the second Bose-Einstein condensate we simply illuminate with the coupling laser, and the light pulse is regenerated from the second condensate. This happens even though the light pulse was extinguished in a totally different condensate at a different location. Altogether, we have stopped and extinguished a light pulse in one location, turned it into a matter copy, carried it over to another location, and turned the matter copy back to light. (Unit: 7)