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DTSTART;TZID=Europe/Paris:20241210T140000
DTEND;TZID=Europe/Paris:20241210T153000
DTSTAMP:20260413T224104
CREATED:20241209T073022Z
LAST-MODIFIED:20241209T083741Z
UID:11186-1733839200-1733844600@fermi.univ-tlse3.fr
SUMMARY:Rôle des corrélations de l’espace de Fock dans la localisation à plusieurs corps / Simulation quantique sur ordinateurs quantiques bruyants (NISQ). – (Thibault Scoquart  / LPT / Seminar). – 10/12/2024\, 14H
DESCRIPTION:Séminaire LPT \nThibault Scoquart (Institut de technologie de Karlsruhe) \nSeminar LPT\, 10/12/2024\, 14H\, 3R4\, salle de conférence \nSummary : \nIn this seminar\, I will discuss two (more or less) unrelated projects that I worked on during my postdoc at KIT.\nIn a first part\, I will present our conclusions regarding the role of correlations of Fock-space matrix elements in ergodicity-to-Many-Body Localization (MBL) transitions [1]. To study this\, we introduce five different disordered spin models and describe analytically and numerically the scaling of their finite-size critical disorder Wc(n) with the system size n. The MBL transition in these models can be seen as the Anderson localization problem for a fictitious particle hopping over their hypercube Fock space structure. The models are built such that they have the same distributions of diagonal (energy) and off-diagonal (hopping) Fock-space matrix elements but very different correlations. One of these models is a typical disordered 1D spin chain\, paradigmatic for the study of MBL\, and another is the quantum random energy model (QREM) with no Fock-space correlations at all\, making it analytically more tractable. The three other models bridge the gap between these two extremes. A cross-comparison of Wc(n) for all five models demonstrates to which extent the scaling of the MBL transition is governed by a combined effect of Fock-space correlations of diagonal and off-diagonal matrix elements.\nIn a second part of the talk\, I will give an overview of our work on digital quantum simulations performed on IBM superconducting quantum computers\, one of the main current im- plementations of Noisy Intermediate-Scale Quantum computers (NISQ). The focus will be on our work about noise characterization\, noise tailoring and error mitigation via quantum circuit sampling on such devices\, using short-scale simulations of BCS dynamics as a benchmark [2\, 3]. I will also discuss some perspectives on the quantum simulation of quenched thermalizing dynamics on NISQ [4]. \n[1] T. Scoquart\, I. Gornyi and A. Mirlin\, Role of Fock-space correlations in many-body localization\, Physical Review B 109\, 214203\, (2024) \n[2] H. Perrin\, T. Scoquart\, A. Shnirman\, J. Schmalian\, and K. Snizhko\, Mitigating crosstalk errors by randomized compiling : Simulation of the BCS model on a superconducting quantum computer\, Phys. Rev. Research 6\, 013142 (2024) \n[3] T. Scoquart\, H. Perrin and K. Snizkho\, Noise-tailoring for error mitigation on a digital quantum computer (Soon to appear on arXiv) \n[4] H. Perrin\, T. Scoquart\, A. I. Pavlov\, N. V. Gnezdilov\, Dynamic thermalization on noisy quantum hardware\, arXiv:2407.04770
URL:https://fermi.univ-tlse3.fr/event/tba-thibault-scoquart-lpt-seminar-10-12-2024-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
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