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UID:0-804@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20220215T110000
DTEND;TZID=Europe/Paris:20220215T120000
DTSTAMP:20220208T133906Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-adam-nahum-lpens/
SUMMARY:Séminaire du LPTMS :  Adam Nahum (LPENS) - Petit amphi\, bâtiment
  Pascal n° 530 - 15 Fév 22 11:00
DESCRIPTION:Quantum dynamics with an observer: the measurement phase transi
 tion\nAdam Nahum (Laboratoire de Physique de l’Ecole Normale Supérieure
 )\nOnsite seminar + zoom.\n\nZoom link:\nhttps://cnrs.zoom.us/j/9228360542
 9?pwd=ZTRuWmR4T0dHVWh2M0VRUzhrc2p6QT09\n\nMeeting ID: 922 8360 5429\nPassc
 ode: vv58du\n\n\nIn the quantum world\, measurements inevitably affect the
  state of a system\, via wavefunction collapse. This means that the dynami
 cs of a system which is continually being monitored by an observer is fund
 amentally different from the dynamics of a closed system. In particular\, 
 for a spatially extended system\, local measurements of the degrees of fre
 edom can “compete" with chaotic dynamics: while chaotic dynamics tends t
 o produce complex\, entangled quantum wavefunctions\, local measurements t
 end to collapse the wavefunction into something simpler. I will describe h
 ow this leads to a dynamical phase transition between a weak monitoring ph
 ase\, where the state is complex and entangled\, and a strong monitoring p
 hase\, where the state is simple and “classical”. I will sketch the re
 levance of this transition to the classical simulation of quantum dynamics
 \, and some theoretical approaches to understanding the transition.
CATEGORIES:seminars
LOCATION:Petit amphi\, bâtiment Pascal n° 530\, rue André Rivière\, Ors
 ay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Rivière\, Orsay
 \, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Petit amphi\, bâtiment Pasca
 l n° 530:geo:0,0
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