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SUMMARY:JCMS: Exceptional points in open quantum systems: From multiblock 
 structure to non-Markovian dynamics
DTSTART:20260511T083000Z
DTEND:20260511T093000Z
DTSTAMP:20260517T004700Z
UID:indico-event-9662@indico.fysik.su.se
DESCRIPTION:Speakers: Aysel Shiralieva (University of Würzburg)\n\nOpen q
 uantum systems in the Markovian regime can be approximately described by n
 on-Hermitian Hamiltonians (NHHs) and Liouvillian superoperators. The two a
 pproaches differ by quantum jump terms corresponding to a measurement of t
 he system by its environment. We analyze the emergence of exceptional poin
 ts (EPs) in NHHs and Liouvillian superoperators. In particular\, we show h
 ow EPs in NHHs relate to a novel type of EPs --- multi-block EPs --- in th
 e no-jump Liouvillian\, i.e. the Liouvillian superoperator in absence of q
 uantum jump terms. We further analyze how quantum jump terms modify the mu
 lti-block structure. To illustrate our general findings\, we present two p
 rime examples: qubits and qutrits coupled to additional ground state level
 s that serve as sinks of the population. In those examples\, we can naviga
 te through the EP block structure by a variation of physical parameters. W
 e analyze how the dynamics of the population of the states is affected by 
 the order of the EPs. Additionally\, we demonstrate that the quantum geome
 tric tensor serves as a sensitive indicator of EPs of different kinds.  F
 inally\, we extend our analysis to non-Markovian evolution within framewor
 ks where a time-local master equation can be expressed into a Lindblad-lik
 e form.\n\nhttps://indico.fysik.su.se/event/9662/
LOCATION:Albano 3: 6228 - Mega (22 seats) (Albano Building 3)
URL:https://indico.fysik.su.se/event/9662/
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