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UID:0-1057@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20251013T140000
DTEND;TZID=Europe/Paris:20251013T151500
DTSTAMP:20250908T121142Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/informal-quantum-
 seminar-andrea-pizzi-universite-de-cambridge/
SUMMARY:Informal quantum seminar: Andrea Pizzi (Université de Cambridge) -
  Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 13 
 Oct 25 14:00
DESCRIPTION:Genuine quantum scars in many-body spin systems\n&nbsp\;\nAndre
 a Pizzi (Université de Cambridge)\n&nbsp\;\n\nChaos makes isolated system
 s of many interacting particles quickly thermalize and forget their past. 
 While this picture applies to simple observables such as order parameters 
 and correlators\, it need not extend to more complex quantities like many-
 body wavefunction amplitudes\, that are becoming accessible in quantum com
 puters and simulators and can reveal a richer structure. In this talk\, I 
 will show that although the quantum eigenstates are thermal and strongly e
 ntangled\, many of them are genuinely scarred\, that is\, have an enlarged
  amplitude along underlying classical unstable periodic orbits. Scarring p
 roduces non-Porter-Thomas amplitude statistics and makes the system more l
 ikely to revisit the orbit it was initialized on\, retaining memory of its
  past and weakly breaking ergodicity. I will demonstrate the ubiquity of q
 uantum scarring across a broad family of spin models\, including widely st
 udied examples from condensed matter physics. Some features of scarring ev
 en extend beyond periodic orbits\, giving rise to “quantum trails” alo
 ng generic trajectories. These findings prove structure in spite of chaos 
 in many-body quantum systems.
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:20250330T030000
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