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DTSTART;TZID=Europe/Paris:20251103T110000
DTEND;TZID=Europe/Paris:20251103T123000
DTSTAMP:20260409T094920
CREATED:20251029T153205Z
LAST-MODIFIED:20251030T091920Z
UID:11729-1762167600-1762173000@fermi.univ-tlse3.fr
SUMMARY:Intrication quantique dans les systèmes de particules identiques : bases et applications. -(Christian Schilling / LPT / Seminar). - 3/11/2025\, 11H
DESCRIPTION:Séminaire LPT \nChristian Schilling (Centre Sommerfeld de physique théorique\, LMU Munich) \nSeminar LPT\, 3/11/2025\, 11H\, 3R4\, salle de conférence \nSummary \nEntanglement is a fundamental feature of the quantum world and a key resource for quantum information processing. While the concept of entanglement for distinguishable particles is well established\, its validity for identical particles remains a subject of debate and misconceptions. In this talk\, we resolve this foundational issue: We demonstrate that identical particles do not form proper subsystems\, rendering the concept of entanglement inapplicable to identical particles in first quantization. However\, in second quantization\, where the focus shifts from particles to the inherently distinguishable orbitals\, entanglement becomes well-defined. We then systematically apply this perspective to physics and chemistry. In particular\, we show how quantum phase transitions manifest within this framework and how it provides a deeper understanding of chemical bonding. Furthermore\, we propose a systematic approach to enhancing wave function methods for strongly correlated electron systems\, relevant to both classical and quantum computing. Altogether\, these insights highlight the deep connection between quantum information and many-body physics\, demonstrating fruitful synergies that can foster the second quantum revolution.\n\n[1] D.Aliverti-Piuri\, J.Liebert\, C.Schilling\, forthcoming\n[2] D.Aliverti-Piuri\, K.Chatterjee\, L.Ding\, K.Liao\, J.Liebert\, C.Schilling\, Faraday Discuss. 254\, 76 (2024)\n[3] K.Liao\, L.Ding\, C.Schilling\, J. Phys. Chem. Lett. 15 \, 6782 (2024)\n[4] L.Ding\, S.Knecht\, C.Schilling\, J. Phys. Chem. Lett. 14\, 11022 (2023)\n[5] L.Ding\, S.Mardazad\, S.Das\, S.Szalay\, U.Schollwöck\, Z.Zimborás\, C.Schilling\, J. Chem. Theory Comput. 17\, 79 (2021) \n\n\n\n 
URL:https://fermi.univ-tlse3.fr/event/intrication-quantique-dans-les-systemes-de-particules-identiques-bases-et-applications-christian-schilling-lpt-seminar-3-11-2025-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251104T140000
DTEND;TZID=Europe/Paris:20251104T153000
DTSTAMP:20260409T094920
CREATED:20251028T143744Z
LAST-MODIFIED:20251030T091926Z
UID:11732-1762264800-1762270200@fermi.univ-tlse3.fr
SUMMARY:Réseaux de tenseurs pour la résolution d’EDP multi-échelles. -(Jheng-Wei Li / LPT / Seminar). - 4/11/2025\, 14H
DESCRIPTION:Séminaire LPT \nJheng-Wei Li (CEA) \nSeminar LPT\, 4/11/2025\, 14H\, 3R4\, salle de conférence \nSummary \nMany problems in science and engineering are described by partial differential equations (PDEs). Examples range from neutron diffusion in nuclear reactors to electron motion on superlattices. These equations are hard to solve in practice because they involve many different length scales that render conventional discretization approaches prohibitively costly. \nIn this talk\, I will show how ideas from many-body physics\, in particular tensor networks\, can overcome this difficulty. Tensor networks are clever ways of compressing large\, structured data without losing essential information. Originally invented to describe quantum many-body wavefunctions\, they can also be adapted to PDEs. I will use two simple\, instructive examples to illustrate how to accomplish this. \nThe key message is that « exponentially many » variables do not necessarily imply « exponentially hard » computations. By bridging concepts from many-body physics and functions of continuous variables\, tensor networks give a promising pathway toward a scalable approach for multi-scale PDEs and beyond. \n\n\n\n 
URL:https://fermi.univ-tlse3.fr/event/reseaux-de-tenseurs-pour-la-resolution-dedp-multi-echelles-jheng-wei-li-lpt-seminar-4-11-2025-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251112T140000
DTEND;TZID=Europe/Paris:20251112T153000
DTSTAMP:20260409T094920
CREATED:20251112T082449Z
LAST-MODIFIED:20251112T082516Z
UID:11762-1762956000-1762961400@fermi.univ-tlse3.fr
SUMMARY:Quantum Thermalization via Travelling Waves. -(Antonio Picano /  LPT / Seminar). - 12/11/2025\, 14H
DESCRIPTION:Séminaire LPT \nAntonio Picano (Collège de France) \nSeminar LPT\, 12/11/2025\, 14H\, 3R4\, salle de conférence \nSummary\nIsolated quantum many-body systems which thermalize under their own dynamics are expected to act as their own thermal baths [1]\, thereby losing memory of initial conditions and bringing their local subsystems to thermal equilibrium. Here [2]\, we show that the infinite-dimensional limit of a quantum lattice model\, as described by dynamical mean-field theory (DMFT)\, provides a natural framework to understand this self-consistent thermalization process [3\, 4]. Using the Fermi-Hubbard model as a working example\, we demonstrate that the emergence of a self-consistent bath occurs via a sharp thermalization front\, moving ballistically and separating the initial condition from the long time thermal fixed point (Fig. 1). We characterize the full DMFT dynamics through an effective temperature for which we derive a traveling wave equation of the Fisher-Kolmogorov-Petrovsky-Piskunov type [5]. This equation allows for predicting the asymptotic shape of the front and its velocity\, which match perfectly the full DMFT numerics. Our results provide a new angle to understand the onset of quantum thermalization in closed isolated systems. \nA natural avenue for future applications of this methodology is the case of disordered quantum many-body systems\, using statistical DMFT [6]. We can expect that\, in an Anderson localized phase\, the ballistic front would give way to a localized one\, which never loses memory of the initial condition. In the presence of disorder and interactions\, we argue a competition between thermalizing fronts and pinning due to disorder\, which could shed new light on the stability of many-body localization. \nReferences \n[1] R. Nandkishore and D. A. Huse\, Annu. Rev. Condens. Matter Phys. 6\, 15 (2015).\n[2] A. Picano\, G. Biroli\, M. Schirò\, Physical Review Letters 134\, 116503\, (2025).\n[3] A. Georges\, G. Kotliar\, W. Krauth\, and M. J. Rozenberg\, Rev. Mod. Phys. 68\, 13 (1996).\n[4] H. Aoki\, N. Tsuji\, M. Eckstein\, M. Kollar\, T. Oka\, and P. Werner\, Rev. Mod. Phys. 86\, 779 (2014).\n[5] É. Brunet and B. Derrida\, J. Stat. Phys. 161\, 801 (2015).\n[6] E. Miranda and V. Dobrosavljević\,\, Rep. Prog. Phys. 68\, 2337 (2005).
URL:https://fermi.univ-tlse3.fr/event/quantum-thermalization-via-travelling-waves-antonio-picano-lpt-seminar-12-11-2025-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251118T140000
DTEND;TZID=Europe/Paris:20251118T150000
DTSTAMP:20260409T094920
CREATED:20251109T130009Z
LAST-MODIFIED:20251112T083820Z
UID:11695-1763474400-1763478000@fermi.univ-tlse3.fr
SUMMARY:TBA. - (Nuris Figueroa-Morales / LPT / Seminar). - 18/11/2025\, 14H
DESCRIPTION:Séminaire LPT \nNuris Figueroa-Morales (Université du Colorado à Boulder) \nSeminar LPT\, 18/11/2025\, 14H\, 3R4\, salle de conférence
URL:https://fermi.univ-tlse3.fr/event/tba-nuris-figueroa-morales-lpt-seminar-18-11-2025-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251120T140000
DTEND;TZID=Europe/Paris:20251120T153000
DTSTAMP:20260409T094920
CREATED:20251108T084445Z
LAST-MODIFIED:20251112T084533Z
UID:11769-1763647200-1763652600@fermi.univ-tlse3.fr
SUMMARY:Simulation de systèmes quantiques à plusieurs corps. - (Olivier Simard / LPT / Seminar). - 20/11/2025\, 14H
DESCRIPTION:Séminaire LPT \nOlivier Simard (École Polytechnique) \nSeminar LPT\, 20/11/2025\, 14H\, 3R4\, salle de conférence \nSummary\nA significant part of the condensed matter community has been devoted to understanding and modelling strongly correlated quantum materials. To tackle the complexity of quantum many-body problems\, a wide array of « classical » computational methods has been developed [1-3]. Paradigmatic models such as the Hubbard model (and its extensions) or the transverse-field Ising model—despite their apparent simplicity—have sparked extensive computational investigations in both equilibrium and nonequilibrium settings. In recent years\, progress in algorithms and increasing classical computational power have led to a convergence of state-of-the-art methods\, which now begin to agree within their overlapping regimes of applicability [4-6]. Yet\, quantum systems exhibiting long-range entanglement at low temperatures remain especially challenging for classical numerical approaches. An alternative route is provided by synthetic quantum simulators: experimental platforms governed by quantum mechanics that implement target Hamiltonians [7-9]. These include cold atoms in magneto-optical lattices and superconducting circuits. Among them\, cold atom platforms stand out for their flexibility in realizing diverse systems and finely tuning microscopic interactions\, achieving temperatures low enough to explore exotic phenomena such as unconventional superconductivity [10]. However\, current quantum simulators still suffer from imperfections and noise [11-13]\, and many relevant quantum systems have yet to be mapped onto these platforms. In this seminar\, I will present several classes of classical numerical methods designed to address quantum many-body problems in and out of equilibrium\, outlining their advantages and limitations. I will also introduce some quantum simulation architectures and the challenges they face\, and share ideas I have developed with collaborators to overcome these hurdles and enhance their capabilities. \n[1-3] PhysRevB.43.5950\, RevModPhys.68.13\, RevModPhys.90.025003\n[4-6] PhysRevX.13.011007\, PhysRevX.11.041013\, PhysRevX.11.011058\n[7-9] PRXQuantum.2.017003\, Nature Physics 8\, 267–276\, RevModPhys.80.885\n[10] arXiv.2502.00095\n[11-13] RevModPhys.87.637\, PhysRevA.97.053803\, J. Phys. B: At. Mol. Opt. Phys. 49 202001
URL:https://fermi.univ-tlse3.fr/event/simulation-de-systemes-quantiques-a-plusieurs-corps-olivier-simard-lpt-seminar-20-11-2025-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251125T080000
DTEND;TZID=Europe/Paris:20251125T170000
DTSTAMP:20260409T094920
CREATED:20251018T120322Z
LAST-MODIFIED:20251112T084801Z
UID:11698-1764057600-1764090000@fermi.univ-tlse3.fr
SUMMARY:La morphologie comme lecture de l’état cellulaire : classification\, métriques et dynamiques. - (Ashok Prasad / LPT / Seminar). - 25/11/2025\, 14H
DESCRIPTION:Séminaire LPT \nAshok Prasad (Université d’État du Colorado) \nSeminar LPT\, 25/11/2025\, 14H\, 3R4\, salle de conférence \nSummary\nCell morphology offers a powerful and underutilized lens for understanding cellular identity\, behavior\, and state. While transcriptomic and proteomic profiling have revolutionized our capacity to characterize cells\, quantitative morphological features can provide complementary insights into cell state and function. In this talk\, I will present our recent work demonstrating that cells can be robustly classified using a range of morphological metrics derived from microscopy images. I will discuss our ongoing efforts for deeper insight. These include studying the relationship between cell shape\, actin structure and nuclear size and shape as well as by developing new morphological measures that are sensitive to the structure and dynamics of intracellular structures\, especially the actin cytoskeleton and other dynamic biopolymer networks. We simulate the actin cytoskeleton\, incorporating the action of molecular motors and cross-linkers\, and look for features that are sensitive to different initial conditions and differences in temporal dynamics. Ultimately\, we seek to build a framework in which cellular morphology is treated as a high-dimensional\, information-rich signature of cell state. Our work is part of a broader vision of morphology-based phenotyping as a bridge between structure and function in living systems.
URL:https://fermi.univ-tlse3.fr/event/tba-ashok-prasad-lpt-seminar-25-11-2025-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251126T140000
DTEND;TZID=Europe/Paris:20251128T120000
DTSTAMP:20260409T094920
CREATED:20251017T065119Z
LAST-MODIFIED:20251031T095443Z
UID:11751-1764165600-1764331200@fermi.univ-tlse3.fr
SUMMARY:Theory days on Ehrenfest dynamics and beyond . - (Meeting / LPT)\, 26-28/11/2025
DESCRIPTION:Organizers : P. M. Dinh\, and E. Suraud \nAim and objectives\nFollowing the tradition of the previous successful meetings that have started in 2009\, the Theory Days workshop aims at stimulating constructive discussions\, collaborations\, and knowledge exchange among a selected group of theoreticians. This year\, the 17th edition will be dedicated to « Ehrenfest Dynamics and beyond ». \nThe coupling of electrons to ionic degrees of freedom is a central issue for the global understanding of dynamics in molecules and clusters. This is especially true in the case of dynamical scenarios far off equilibrium such as those experienced during irradiation processes by a laser or via the interaction with a swift charged projectiles. While short time dynamics may usually be safely analysed overlooking ionic dynamics\, the account of the latter cannot be omitted on longer time scales. This is thus essential to properly account for the coupling of electrons to ions during the whole dynamical evolution in order to reach a complete description for example of irradiation scenarios. This is clearly a must go to theory approaches but it is also crucial to link modelling to experimental results which are often attained on time scales much larger than the explored processes themselves. \nUsual treatments of electron dynamics couple to ions in an « average way » often loosely quoted « Ehrenfest dynamics ». Ehrenfest dynamics may be sufficient to address some classes of dynamical scenarios but is well known to suffer from potentially severe defects in some other situations\, for example when bifurcations take place. These defects are known since long and numerous methods have been developed over the years to overcome (some of) these difficulties. The aim of the workshop is to discuss state of the art of some of these methods developed to overcome limitations of standard Ehrenfest dynamics. Recent developments will be particularly addressed\, in particular to the extent that increasing computational power allows more and more ambitious and realistic complete treatment of dynamics. \nWe plan to gather people from various groups working in this domain\, mostly in western Europe. The workshop is intended to be a working forum\, thus rather informal. The format will consist in a series of long detailed talks\, typically 1 hour (40 mn talk + 10 mn for questions) focusing in particular on ongoing problems and open issues. We thus urge participants to prepare their talks in this spirit. Ultimately a most efficient organization would consist in having a limited number of talks per representative group in order to avoid doublings. \nsee more details : here
URL:https://fermi.univ-tlse3.fr/event/theory-days-on-ehrenfest-dynamics-and-beyond-meeting-lpt-26-28-11-2025/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Symposium / Congress
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