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VERSION:2.0
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CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260914T121808Z
LAST-MODIFIED:20200205T175534Z
DTSTART:20200207T163000Z
DTEND:20200207T173000Z
UID:event2300@bu.edu
URL:http://physics.bu.edu/internal/events/show/2300
SUMMARY:Counterdiabatic and inhomogeneous driving in lattice gauge quantum 
	computing and heat engines
DESCRIPTION:Featuring Andreas Hartmann \, University of Innsbruck\n\nPart o
	f the Condensed Matter Theory Seminar Series.\n\nWe present a coherent coun
	ter-diabatic quantum protocol to prepare ground states in the lattice gauge
	 mapping of all-to-all Ising models (LHZ) with considerably enhanced final 
	ground state fidelity compared to a quantum annealing protocol. We make use
	 of a variational method to find approximate counter-diabatic Hamiltonians 
	that has recently been introduced by Sels and Polkovnikov [Proc. Natl. Acad
	. Sci. 114\, 3909 (2017)]. The resulting additional terms in our protocol a
	re time-dependent local on-site y-magnetic fields. A single free parameter 
	is introduced which is optimized via classical updates. The protocol consis
	ts only of local and nearest-neighbor terms which makes it attractive for i
	mplementations in near term experiments. We further present an inhomogeneou
	s driving protocol in LHZ with modified transverse fields with improved gro
	und state fidelity and enlarged minimal energy gaps. The inhomogeneously dr
	iven transverse field introduces an additional time-dependent parameter tha
	t improves the efficiency of the method. For the 2D lattice gauge model LHZ
	 we analytically derive the free energy term and numerically verify it. At 
	last\, the application of these counter-diabatic terms in the field of quan
	tum heat engines to speed up a quantum Otto heat engine will be presented.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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