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VERSION:2.0
PRODID:-//Nonequilibrium quantum and statistical physics - ECPv4.5.3//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Nonequilibrium quantum and statistical physics
X-ORIGINAL-URL:http://chaos.fmf.uni-lj.si
X-WR-CALDESC:Events for Nonequilibrium quantum and statistical physics
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20171114T140000
DTEND;TZID=Europe/Ljubljana:20171114T150000
DTSTAMP:20180223T195235
CREATED:20171102T110639Z
LAST-MODIFIED:20171209T103016Z
UID:523-1510668000-1510671600@chaos.fmf.uni-lj.si
SUMMARY:Silvia Pappalardi: Scrambling and entanglements spreading in long-range spin chains
DESCRIPTION:Out of Time Ordered Correlators (OTOCs) have been suggested as a probe of scrambling (generically referred as the delocalization of quantum information) and as a measure of chaos in quantum many-body systems. We explore scrambling in connection to entanglement dynamics in generic long-range systems\, and in particular in the infinite-range Ising model. We study both bipartite and multipartite entanglement dynamics and we compare the results with the OTOCs of collective spin operators.\n\nWe argue that scrambling and entanglement growth are two distinct phenomena\, characterized by two different time scales. While entanglements saturate at a time $t_{Ehr}\sim \sqrt N$ at which the semi-classical approximation breaks\, the OTOCs keep growing in time up to $N$. Furthermore\, by expanding in spin waves on top of the classical solution\, we are able to device an approximated semi-analytic method that predicts the behavior of the OTOC up to $t_{Ehr}$. This method seems to be generic for long-range interacting hamiltonians and can be extended adding interaction to the hamiltonian.\n\n* Silvia Pappalardi\, SISSA\, Trieste
URL:http://chaos.fmf.uni-lj.si/?tribe_events=silvia-pappalardi-scrambling-and-entanglements-spreading-in-long-range-spin-chains
LOCATION:Jadranska 19\, Ljubljana\, Slovenia
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