PUMPING TWO DILUTE-GAS BOSE-EINSTEIN CONDENSATES WITH RAMAN LIGHT SCATTERING

Department of Physics and Theoretical Physics, Faculty of Science, Australian National University, ACT 0200, Australia(July 14, 2011)We propose an optical method for increasing the numberof atoms in a pair of dilute gas Bose-Einstein condensates.The method uses laser-driven Raman transitions which scat-ter atoms between the condensate and non-condensate atomfractions. For a range of condensate phase differences there isdestructive quantum interference of the amplitudes for scat-tering atoms out of the condensates. Because the total atomscattering rate into the condensates is unaffected the conden-sates grow. This mechanism is analogous to that responsiblefor optical lasing without inversion. Growth using macro-scopic quantum interference may find application as a pumpfor an atom laser.03.75.Fi,42.50.Vk,05.30.Jp,32.80.Pj