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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20261024T211244Z
LAST-MODIFIED:20190221T165711Z
DTSTART:20190225T164500Z
DTEND:20190225T174500Z
UID:event2119@bu.edu
URL:http://physics.bu.edu/internal/events/show/2119
SUMMARY:Aspects of entanglement growth after a quantum quench
DESCRIPTION:Featuring Tibor Rakovszky\, TU Munich\n\nPart of the Biophysics
	/Condensed Matter Seminar Series.\n\nThe growth of entanglement plays a fun
	damental role in the process of thermalization in closed quantum systems an
	d has recently become amenable to experimental detection\, through the meas
	urement of so-called higher Rényi entropies. In this talk I will show that
	 the behavior of such Rényi entropies can be qualitatively different from 
	that of the theoretically more studied von Neumann entropy; in particular I
	 will argue that the former grow sub-ballistically\, as the square root of 
	time\, in systems with diffusive transport. I provide evidence for this in 
	both a U(1) symmetric random circuit model and in a non-integrable spin cha
	in\, where energy is the sole conserved quantity\, and interpret the result
	s as a consequence of local quantum fluctuations in conserved densities. \n
	In the second part of the talk I will discuss the dynamics of the entanglem
	ent spectrum of small subsystems and use it to identify signatures of the d
	ifferent dynamical velocities that control thermalization. In particular I 
	will show how the onset of level repulsion in the spectrum occurs at differ
	ent timescales depending on the 'entanglement energy'\, and relate this to 
	the problem of operator spreading.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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