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Condensed Matter Physics Seminar


Quantum Impurity Entanglement

Erik Sorenson
McMaster University

Time
 
Wed. February 7, 2007     10:30 AM     Stirling 201

Abstract
 
A system that can be divided into two parts A and B is said to be entangled if the ground-state wavefunction cannot be written as a product $|A>|B>$. While entanglement is at the foundation of the fields of quantum information/computing it has recently been recognized as a crucial concept for understanding quantum critical phenomena, topological phases and efficient numerical methods as they are used in the field of condensed matter. In this talk I will try to describe some of these recent developments from the point of view of both theory and experiment. In particular, I will focus on entanglement in spin chains and describe recent work showing how impurities become entangled with the bulk spin chain. In some cases a simple intuitive picture can be developed allowing for almost exact variational calculations.

NOTE: Room change!

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