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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2599
DTSTART:20120220T223000Z
DURATION:PT1H0M0S
DTSTAMP:20260415T194428Z
LAST-MODIFIED:20120207T222038Z
LOCATION:5310 Chamberlin
SUMMARY:Topology of Quantum Discord\, Condensed Matter Theory Group Se
 minar\, Nga Nguyen\, UW-Madison
DESCRIPTION:Quantum discord is arguably a more sensitive measure of qu
 antum correlations than quantum entanglement\, and may be able to serv
 e as a resource for quantum computation.  All quantum correlations are
  subject to destruction by external noise.  The route by which this de
 struction takes place depends on the shape of the hypersurface of zero
  discord in the space of generalized Bloch vectors.  In the case of 2 
 qubits\, we show that\, except at the origin\, this hypersurface is a 
 9-dimensional manifold with boundary embedded in a 15-dimensional back
 ground space.  This is done by computing the tangent vectors explicitl
 y and verifying that there are no self-intersections.  We discuss the 
 implications for the time evolution of discord in physical models\, wh
 ich contrasts sharply with the evolution of entanglement.    
URL:https://www.physics.wisc.edu/events/?id=2599
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