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UID:0-937@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20240227T110000
DTEND;TZID=Europe/Paris:20240227T120000
DTSTAMP:20240215T092024Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-dganit-meidan-negev/
SUMMARY:Séminaire du LPTMS : Dganit Meidan (Ben-Gurion University) - Salle
  des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 27 Fév 2
 4 11:00
DESCRIPTION:Theory of free fermion dynamics - from monitored to post select
 ed evolutionDganit Meidan (Ben-Gurion University)Monitored quantum systems
  undergo Measurement-induced Phase Transitions (MiPTs) stemming from the i
 nterplay between measurements and unitary dynamics. When the detector read
 out is post- selected to match a given value\, the dynamics is generated b
 y a Non-Hermitian Hamiltonian with MiPTs characterized by different univer
 sal features. Here\, we derive a partial post-selected stochastic Schrodin
 ger equation based on a microscopic description of continuous weak measure
 ment. This formalism connects the monitored and post-selected dynamics to 
 a broader family of stochastic evolution. We apply the formalism to a chai
 n of free fermions subject to partial post-selected monitoring of local fe
 rmion parities. Within a 2-replica approach\, we obtained an effective bos
 onized Hamiltonian in the strong post-selected limit. Using a renormalizat
 ion group analysis\, we find that the universality of the non-Hermitian Mi
 PT is stable against a finite (weak) amount of stochasticity. We further s
 how that the passage to the monitored universality occurs abruptly at fini
 te partial post-selection\, which we confirm from the numerical finite siz
 e scaling of the MiPT. Our approach establishes a way to study MiPTs for a
 rbitrary subsets of quantum trajectories and provides a potential route to
  tackle the experimental post-selected problem.
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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DTSTART:20231029T020000
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