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DTSTAMP:20261018T052807Z
LAST-MODIFIED:20130417T202432Z
DTSTART:20130422T150000Z
DTEND:20130422T160000Z
UID:event1100@bu.edu
URL:http://physics.bu.edu/internal/events/show/1100
SUMMARY:The Dissipative Dynamics of a Bose-Hubbard Dimer
DESCRIPTION:Featuring Ted Pudlik\n\nPart of the Preliminary Oral Exam.\n\nE
	xamining Committee:  David Campbell\, Anatoli Polkovnikov\, Richard Averitt
	\, Emanual Katz\n\nAbstract:\nThe Bose-Hubbard dimer is a good model for ce
	rtain systems of ultra cold gases in optical traps.  One example is atoms i
	n a double-well optical lattice; another is atoms in a single optical trap\
	, but with two interacting spin states.  For certain parameter values\, the
	 Bose-Hubbard dimer can be approximated by semiclassical equations of motio
	n for z\, the imbalance in the two modes' atomic populations\, and φ\, 
	the modes' relative phase.  Surprisingly\, the semiclassical model not only
	 predicts the dynamics of z and φ\, but contains information about the 
	entanglement of the modes: a coherent state centered near a fixed point of 
	the semiclassical equations remains entangled much longer than one located 
	near a separatrix.\n\nIf the classical phase space allows us to predict the
	 robustness of an entangled state\, could it suggest strategies for improvi
	ng entanglement?  One counterintuitive path to better entanglement is contr
	olled dissipation.  My work uses the semiclassical picture to shed light on
	 the mechanisms by which dissipation in the form of atom loss affects entan
	glement in the Bose-Hubbard dimer.  This allows me to distinguish purely qu
	antum effects from semiclassical ones\, and suggests novel approaches for r
	ealizing highly entangled states of spatially separated Bose-Einstein conde
	nsates.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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