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BEGIN:VEVENT
DTSTAMP:20261020T094542Z
LAST-MODIFIED:20190508T153430Z
DTSTART:20190510T180000Z
DTEND:20190510T190000Z
UID:event2137@bu.edu
URL:http://physics.bu.edu/internal/events/show/2137
SUMMARY:Simulated and Quantum Annealing Dynamics of the 2D Ising Model
DESCRIPTION:Featuring Phillip Weinberg\n\nPart of the Departmental Seminars
	.\n\nDissertation Committee: Anders Sandvik\, Anatoli Polkovnikov\, Shyam E
	rramilli\, Alex Sushkov\, and David Campbell\n\nAbstract:\n\nDeveloping met
	hods of optimizing cost functions with complicated energy landscapes is an 
	old and important idea that could be applied to many challenging computatio
	nal problems. One of the simplest methods of accomplishing this optimizatio
	n is through annealing. Annealing is a process where the dynamics of a phys
	ical system is simulated in a computer or in a real experiment to explore t
	he energy landscape of the cost function. \nThe hope being that if the fluc
	tuations induced by the dynamics are tuned to 0 very slowly\, the system wi
	ll settle into the minimum of the cost function. In this talk we will explo
	re the 2-D Ising model\, comparing quantum annealing (QA) and a classical m
	ethod of annealing through numerical simulations called simulated annealing
	 (SA). Although the energy landscape is not rough or complicated\, we find 
	a distinct difference between QA and SA. We find two time scale associated 
	with he relaxation of the system during SA. The faster time scale goes as L
	^2 while the slower time scale goes as L^3\, L being the linear system size
	. We show that the slow time scale is associated with the formation of syst
	em spanning domain walls which pose difficulties for SA to anneal away. Con
	trast this with QA which shows only one time scale going as L^2\, while at 
	the same time showing signs of exploring the domain wall states during the 
	annealing process. We will discuss these results in the context of the deba
	te of whether quantum annealing is more efficient than classical methods fo
	r annealing. We will also discuss these results in the context of\, what is
	 claimed to be an actual quantum annealer\, the D'wave quantum computer.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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