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BEGIN:VEVENT
DTSTAMP:20261018T123018Z
LAST-MODIFIED:20191203T152716Z
DTSTART:20191204T170000Z
DTEND:20191204T180000Z
UID:event2247@bu.edu
URL:http://physics.bu.edu/internal/events/show/2247
SUMMARY:Student Seminar Series
DESCRIPTION:Featuring Phil Weinberg\, Boston University\nHosted by: Eric Bo
	yers\n\nPart of the Graduate Student Council Events.\n\nPhil Weinberg (CMT)
	\nScaling and diabatic effects in quantum annealing with a D-Wave device\n\
	nWe discuss quantum annealing of the two-dimensional transverse-field Ising
	 model on a D-Wave device\, encoded on L x L lattices with L <= 32. Analyzi
	ng the residual energy and deviation from maximal magnetization in the fina
	l classical state\, we find an optimal L dependent annealing rate v for whi
	ch the two quantities are minimized. The results are well described by a ph
	enomenological model with two powers of v and L-dependent prefactors to des
	cribe the competing effects of reduced quantum fluctuations (for which we s
	ee evidence of the Kibble-Zurek mechanism) and increasing noise impact when
	 v is lowered. The same scaling form also describes results of numerical so
	lutions of a transverse-field Ising model with the spins coupled to noise s
	ources. We explain why the optimal annealing time is much longer than the c
	oherence time of the individual qubits.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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