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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20260219T150000
DTEND;TZID=Europe/Paris:20260219T180000
DTSTAMP:20260217T083000
UID:MEC-c0f52c6624ae1359e105c8a5d8cd956a@lps.u-psud.fr
CREATED:20260217
LAST-MODIFIED:20260217
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Ilya Vilkoviskiy : Efficient pseudomode representation and the complexity of quantum impurity models
DESCRIPTION:\nSimulation of non-equilibrium properties of quantum systems is one of the central challenges in quantum physics.\n\n\n\nI will concentrate on the quantum impurity models describing the small interacting degree of freedom coupled to a free and large bath. These models exhibit rich phenomena such as phase transitions and non-Markovian behavior but pose significant computational challenges.\n\n\n\nI will review the influence matrix (IM) approach, which allows to approximate an infinite bath by a finite set of effective modes with rigorous complexity guarantees. In particular, I will explain why the computational cost can scale only polynomially with evolution time and desired accuracy. I will also describe a practical numerical procedure for extracting optimized pseudomodes, making the approach more effective for real simulations. Additionally, I will introduce a numerical routine for extracting optimal pseudomodes, enhancing practical applicability.\n\n\n\ncontact : andrej.meszaros@universite-paris-saclay.fr ( mailto:andrej.meszaros@universite-paris-saclay.fr )\n\n\n\n\n
URL:https://www.lps.u-psud.fr/events/ilya-vilkoviskiy-efficient-pseudomode-representation-and-the-complexity-of-quantum-impurity-models/
ORGANIZER;CN=Andrej Meszaros:MAILTO:
CATEGORIES:Séminaire de la Théorie de la Matière Condensée,Séminaires
LOCATION:Zoom (Online)
ATTACH;FMTTYPE=image/jpeg:https://www.lps.u-psud.fr/wp-content/uploads/2026/02/viskoviskiy_ilya_2024.jpg
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