Adding a Second Condensate

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

After creation of a perfect matter copy of a light pulse that was extinguished in the first Bose-Einstein condensate (left), the matter copy travels in free space to a second Bose-Einstein condensate (right). If we don't do anything, the matter copy simply travels through this second condensate and exits on the other side. (Unit: 7)