BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//wp-events-plugin.com//6.4.7.2//EN
TZID:Europe/Paris
X-WR-TIMEZONE:Europe/Paris
BEGIN:VEVENT
UID:0-1141@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260917T140000
DTEND;TZID=Europe/Paris:20260917T170000
DTSTAMP:20260612T145704Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/soutenance-de-the
 se-benoit-ferte/
SUMMARY:Soutenance de thèse Benoit Ferté - LPENS Paris - 17 Sep 26 14:00
DESCRIPTION:Thermalization and emergence of classicality in many-body quant
 um systems\nBenoit Ferté\n&nbsp\;\n\nLieu de la soutenance : LPENS\, 24 r
 ue Lhomond 75005 Paris\, salle Conférence 4\n\n\nThe goal of this thesis 
 is to study how quantum information spreads from a microscopic system to a
  macroscopic environment. To do so\, we define the notion of phases of inf
 ormation propagation\, which differentiate how much information an observe
 r with access to some part of the environment is able to learn on the micr
 oscopic system\, a notion close to the concept of objectivity in Quantum D
 arwinism. Phase transitions of information are then probed in several solv
 able models of expanding quantum circuits\, where\, by tuning the ratio be
 tween broadcasting and scrambling of information\, we are able to set obje
 ctivity on or off in the system and to recover the behaviour of a function
 ing or broken measurement apparatus. In a second part\, this notion of obj
 ectivity is compared to the notion of decoherent histories. While these tw
 o formalisms both aim at describing the emergence of "classicality" in qua
 ntum systems\, we show that they in fact define two different kinds of cla
 ssicalities: while the first one is related to the particular micro-to-mac
 ro process involved in a quantum measurement\, the second one emerges sole
 ly from coarse-graining in macro-systems.\n\n\n\n\n\nJury: Xiangyu Cao (di
 recteur de thèse)\, Dragi Karevski\, Mauro Paternostro\, Denis Ullmo\, Vi
 lasini Venkates\n
CATEGORIES:seminars
LOCATION:LPENS Paris\, 24 Rue Lhomond\, Paris\, 75005\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=24 Rue Lhomond\, Paris\, 75
 005\, France;X-APPLE-RADIUS=100;X-TITLE=LPENS Paris:geo:0,0
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/Paris
X-LIC-LOCATION:Europe/Paris
BEGIN:DAYLIGHT
DTSTART:20260329T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
END:DAYLIGHT
END:VTIMEZONE
END:VCALENDAR