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BEGIN:VEVENT
DTSTAMP:20260915T200533Z
LAST-MODIFIED:20150505T123033Z
DTSTART:20150513T150000Z
DTEND:20150513T160000Z
UID:event1446@bu.edu
URL:http://physics.bu.edu/internal/events/show/1446
SUMMARY:A counterexample to the area law for quantum matter
DESCRIPTION:Featuring Ramis Movassagh\, MIT and Northeastern University\nHo
	sted by: Claudio Chamon\n\nPart of the Condensed Matter Theory Seminar Seri
	es.\n\nAbstract:\nEntanglement is a quantum correlation which does not appe
	ar classically\, \nand it serves as a resource for quantum technologies suc
	h as quantum \ncomputing. The area law says that the amount of entanglement
	 between a \nsubsystem and the rest of the system is proportional to the ar
	ea of the \nboundary of the subsystem and not its volume. A system that obe
	ys an \narea law can be simulated more efficiently than an arbitrary quantu
	m \nsystem\, and an area law provides useful information about the low-ener
	gy \nphysics of the system. It was widely believed that the area law could 
	\nnot be violated by more than a logarithmic factor (e.g. based on \ncritic
	al systems and ideas from conformal field theory) in the system’s \nsize.
	 We introduce a class of exactly solvable one-dimensional models \nwhich we
	 can prove have exponentially more entanglement than previously \nexpected\
	, and violate the area law by a square root factor.  We also \nprove that t
	he gap closes as n^{-c}\, where c \ge 2\, which rules out \nconformal field
	 theories as the continuum limit of these models. In \naddition to using re
	cent advances in quantum information theory\, we have \ndrawn upon various 
	branches of mathematics and computer science in our \nwork and hope that th
	e tools we have developed may be useful for other \nproblems as well. (Join
	t work with Peter Shor)
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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