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DTSTART;TZID=Europe/Paris:20260113T140000
DTEND;TZID=Europe/Paris:20260113T150000
DTSTAMP:20260408T182439
CREATED:20260112T060204Z
LAST-MODIFIED:20260112T084104Z
UID:11741-1768312800-1768316400@fermi.univ-tlse3.fr
SUMMARY:Quantum many-body dynamics and the quest for massive entanglement production. - (Tommaso Roscilde / LPT / Seminar). - 13/01/2026\, 14H
DESCRIPTION:Séminaire LPT \nTommaso Roscilde (EPFL) \nSeminar LPT\, 13/01/2026\, 14H\, 3R4\, salle de conférence \nSummary : \nMany-body quantum entanglement is the fundamental trait which separates our macroscopic world and the microscopic one\, in which Schrödinger’s cats do exist — they are simply too small to meow\, for the moment… Many-body entanglement is also the central resource of long-sought quantum technologies of next generation. Identifying effective ways to produce many-body entanglement over the largest possible scales\, and in the shortest possible times\, is clearly a grand challenge for quantum many-body theory and non-equilibrium quantum statistical mechanics. \nIn this talk I will discuss how turning to long-range interacting systems is a natural choice for effective entanglement production. The onset of large-scale multipartite entanglement corresponds in general to the relaxation of the system towards long-range order; and the latter is typically associated with thermalisation of closed quantum systems. I will show that this point of view\, while valid in some cases — such as the quasi-adiabatic preparation of low-energy states — may not be appropriate for the most effective forms of entanglement dynamics. The latter defy the conventional classification schemes (ergodic vs. non-ergodic) of quantum dynamics\, and suggest a more inclusive classification\, which is already accepted in classical physics. \n\n\n\n 
URL:https://fermi.univ-tlse3.fr/event/tba-tommaso-roscilde-lpt-seminar-13-01-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260127T140000
DTEND;TZID=Europe/Paris:20260127T150000
DTSTAMP:20260408T182439
CREATED:20260126T094217Z
LAST-MODIFIED:20260126T095057Z
UID:11794-1769522400-1769526000@fermi.univ-tlse3.fr
SUMMARY:Cicatrices quantiques à N corps en présence de sauts dépendant de la différence de densité. - (William Faugno / LPT / Seminar). - 27/01/2026\, 14H
DESCRIPTION:Séminaire LPT \nWilliam Faugno (LKB) \nSeminar LPT\, 27/01/2026\, 14H\, 3R4\, salle de conférence \nAbstract\nIt has been observed that isolated quantum systems often still produce measured values consistent with thermalization. This is unexpected due to the lack of a notion of chaos or ergodicity and the unitary dynamics of the quantum theory which is at its core linear. The conditions under which we can expect isolated quantum systems to thermalize were laid out in the eigenstate thermalization hypothesis (ETH)\, which has generally been found to hold in a variety of systems. Still\, notable violations of the ETH have been identified where a seemingly chaotic many-body quantum system exhibits some nonthermal behavior. In this talk\, I will introduce the concept of quantum many-body scars (QMBS)\, a phenomenon in which a small subset of eigenstates violates the ETH and promote nonthermal dynamics. I will then present theoretical results on a bosonic Hamiltonian with a density-dependent hopping and describe two distinct mechanisms for scar formation that arise in this model. These mechanisms provide insight into the conditions under which QMBS can be expected to occur.
URL:https://fermi.univ-tlse3.fr/event/tba-william-faugno-lpt-seminar-27-01-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
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