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SUMMARY:Quantum Transport in Interfermoetry in BEC - Peter Drummond (Univ 
 of Technology\, Australia)
DTSTART:20090921T130000Z
DTEND:20090921T140000Z
UID:TALK20051@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Quantum dynamics is one of the most challenging theoretical pr
 oblems\nin science\, due to the underlying exponential complexity. The\nen
 vironmental isolation and simplicity of ultra-cold gases allows\ntheoretic
 al predictions to be tested with unprecedented accuracy. In\nthis talk\, t
 he question of quantum mixtures is investigated. Two\ntheoretical methods 
 will be treated. The first is an exact\nfirst-principles approach\, using 
 the positive P-representation to\ninvestigate the transport and quantum en
 tanglement of a dilute quantum\nimpurity in a host BEC. The second is an a
 pproximate method especially\nuseful on long time-scales. In this approach
  the hydrodynamic\nequations are quantized and solved using a truncated Wi
 gner method.\nThis is applied to 1D interferometry and transport in Rubidi
 um\nisotopic mixtures. It explains how a combination of quantum transport\
 nand phase-diffusion results in fringe decoherence in agreement with\nexpe
 riment.\n\n
LOCATION:RutherfordEP Seminar Room (980) Rutherford Building\, Cavendish L
 aboratory
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