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DTSTART;TZID=Europe/Paris:20230629T090000
DTEND;TZID=Europe/Paris:20230629T103000
DTSTAMP:20260423T141933
CREATED:20230629T064318Z
LAST-MODIFIED:20230629T064318Z
UID:9148-1688029200-1688034600@fermi.univ-tlse3.fr
SUMMARY:Optimal control of quantum systems: Applications to the robust control of Bose-Einstein Condensates and to quantum speed limit with piecewise constant control. - (Etienne Dionis / LCAR / Seminar). - 29/06/2023\, 9H
DESCRIPTION:Etienne Dionis (Laboratoire Interdisciplinaire Carnot de Bourgogne\, Université de Bourgogne-Franche Comté) \nSéminaire LCAR Jeudi 29 juin\, 9H00. – Nouvelle Salle de conférence\, 3R4 \nRésumé :\nThis presentation will focus on two recent applications of optimal control techniques to quantum\nsystems. \nIn the first part\, the goal is to manipulate the motional states of an atomic Bose-Einstein\ncondensate (BEC) in a one-dimensional optical lattice. This study is a joint work wit the experi-\nmental group of Pr. D. Guéry-Odelin in Toulouse University (France). The protocols operate on\nthe momentum comb associated with the lattice through its amplitude and phase [3]. A precise and\nversatile control for a wide variety of targets has been demonstrated. However\, in order to improve\nthe agreement between theory and experiment\, it is important to design control processes that are\nrobust with respect to experimental uncertainties (Figure 1). One limitation of the experimental\nsetup under study is the value of the quasi-momentum which is not exactly zero as assumed in\n[3]. Due to the large dimension of the Hilbert space\, numerical algorithms such as GRAPE [1]\nhave to be used. In the case of the simultaneous control of an ensemble of systems\, we propose\na new formulation of GRAPE with a sequential-update of the control. We show numerically the\nsuperiority of this sequential approach with respect to the standard one [2].\nIn the second part\, we apply a recent extension of the Pontryagin Maximum Principle (PMP) [4]\nto piecewise constant control. PMP\, on which optimal control theory is based\, was originally for-\nmulated for continuous functions. In practice\, experimental implementations resort to piecewise\nconstant signals. In [5]\, the authors have mathematically proved that for general non-linear dy-\nnamics\, the PMP should be modified in a non-trivial way. We have transposed this result to\nquantum systems and applied it to the time-optimal control of simple quantum systems with two\nlevels (Figure 2). In these systems\, we derive exact quantum speed limits accounting for this key\nexperimental constraint [6]. This should be an important step toward understanding the role of\ntechnological limitations in the manipulation of quantum systems\, a key issue in quantum control. \nReferences\n[1] Glaser S. J.\, Boscain U.\, Calarco T.\, Koch C.\, Kockenberger W.\, Kosloff R.\, Kuprov I.\, Luy\nB.\, Schirmer S.\, Schulte-Herbrüggen T.\, Sugny D. and Wilhelm F. 2015 Eur. Phys. J. D 69\,\n279\n[2] Dionis E. and Sugny D. 2022 J. Phys. B: At. Mol. Opt. Phys. 55\, 184006\n[3] Dupont N.\, Chatelain G.\, Gabardos L.\, Arnal M.\, Billy J.\, Peaudecerf B.\, Sugny D. and\nGuéry-Odelin D. 2021 PRX Quantum 2\, 040303\n[4] Boscain U.\, Sigalotti M. and Sugny D. 2021 PRX Quantum 2\, 030203\n[5] Bourdin L. and Trélat E. 2017 Automatica 79\, 273\n[6] Dionis E. and Sugny D. 2023 Physical Review A 107\, 032613
URL:https://fermi.univ-tlse3.fr/event/optimal-control-of-quantum-systems-applications-to-the-robust-control-of-bose-einstein-condensates-and-to-quantum-speed-limit-with-piecewise-constant-control-etienne-dionis-lcar-seminar-2/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LCAR,Seminars
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DTSTART;TZID=Europe/Paris:20230629T140000
DTEND;TZID=Europe/Paris:20230629T160000
DTSTAMP:20260423T141933
CREATED:20230620T083831Z
LAST-MODIFIED:20230621T133442Z
UID:9019-1688047200-1688054400@fermi.univ-tlse3.fr
SUMMARY:Well-defined organometallic precursors for developing tailored catalytic materials. - (Pascual Oña Burgos / LPCNO / Séminaire). – 29/06/2023\, 14H
DESCRIPTION:Pascual Oña Burgos (Instituto de Tecnología Química\, Valencia\, Spain) \nSéminaire LPCNO\, GP seminar room\, INSA\, Bât. 27\, Salle 2.20  \nSummary :\nSmall molecule activation\, such as H2O\, H2\, N2\, O2 or CO2\, constitutes a critical frontier of chemical science\, potentially removing the hazardous global warming gases and providing chemical precursors from Earth’s most abundant molecules. In this talk\, we shall explore how homo and heterometallic complexed can be used as building blocks to achieve different solid materials\, ranging from MOFs to supported metal nanoparticles\, showing enhanced efficiency in these processes.\nSpecifically\, Water splitting is one of the key processes for many energy storage and conversion applications\, being water oxidation or oxygen evolution reaction (OER) still considered the most challenging step. In this regard\, cobalt-based metal-organic frameworks (MOFs) have recently attracted great interest due to their notable electrocatalytic OER activity and the abundance of this metal on Earth.1\,2 Based on that idea\, we developed a new cobalt metal−organic framework (2D-Co-MOF) with well-defined layered double cores strongly connected by intermolecular bonds (Figure 1a). In situ electrochemically activated 2D-Co-MOF@Nafion exhibits an outstanding electrocatalytic performance for the OER at neutral pH and a high robustness. The particular coordination chemistry of the MOF consisting of a regular arrangement of multiple Co(II) redox metal sites connected by appropriate organic ligands explains the higher catalytic activity of this MOF.\nAnother challenge still to be met in water splitting is finding a multifunctional electrocatalyst. In that sense\, the benchmark HER electrocatalysts are Pt-based materials. However\, they are not suitable for OER. On the other hand\, Ir and Ru oxides are state-of-art OER electrocatalysts. Unfortunately\, they show insufficient activity toward HER.\nOn the lookout for these multifunctional systems\, we reported a supported Fe-doped Pd-nanoparticles (NPs) prepared via soft transformation of a PdFe-MOF.3 The thus synthesized bimetallic PdFe NPs are supported on FeOx@C layers\, essential for developing well-defined and distributed small NPs. The application of this material (PdFe@FeOx-C) as a multifunctional nanocatalyst for the electrocatalytic water splitting process has been investigated with promising results in terms of favourable intrinsic activity\, wide pH window and high stability (Figure 2b).4 More recently\, we developed a straightforward\, efficient\, and robust synthesis of mono- and bimetallic nanoparticles promoted through a commercially available metallic source\, the Wilkinson complex\, in order to prepare Rh2P nanoparticles\, which have high crystallinity and are coated with graphitic carbon patches.5 The resulting materials have been tested in electrocatalytic HER and OER processes at acid\, alkaline and neutral media\, providing superb HER activity and competitive OER performance\, particularly at neutral and alkaline media\, compared to the benchmark HER and OER electrocatalysts Pt and RuOx/IrOx\, respectively.6 \nReferences\n[1] Gutiérrez Tarriño\, S.; Olloqui-Sariego\, J. L.; Calvente\, J. J.; Palomino\, M.; Minguez Espallargas\, G.; Jorda\, J. L.; Rey\, F.; Oña-Burgos\, P. ACS Appl. Mat. and Interfaces\, 2019\, 11\, 46658-46665.\n[2] Gutiérrez-Tarriño\, Olloqui-Sariego\, J. L.; Calvente\, J. J.; Minguez Espallargas\, G.; Rey\, F.; Corma\, A.; Oña-Burgos\, P. J. Am. Chem. Soc. 2020\, 142\, 19198−19208.\n[3] Martínez\, J.; Mazarío\, J.; Mínguez\, G. E.; Oña-Burgos\, P. Chem. A Eur. J. 2020\, 26\, 13659.\n[4] Martínez\, J.; Mazarío\, J.; Olloqui-Sariego\, J. L.; Oña-Burgos\, P. Adv. Sustainable Syst. 2022\, 6\, 2200096.\n[5] Galdeano-Ruano\, C.; Corma\, A.; Oña-Burgos\, P. ACS Appl. Nano Mater. 2021\, 4\, 10743.\n[6] Galdeano-Ruano\, C.; Olloqui-Sariego\, J. L.; Oña-Burgos\, P. J. of Catalysis submitted.
URL:https://fermi.univ-tlse3.fr/event/well-defined-organometallic-precursors-for-developing-tailored-catalytic-materials-pascual-ona-burgos-lpcno-seminaire-29-06-2023-14h/
LOCATION:Salle 220\, LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, toulouse\, 31077\, France
CATEGORIES:Events,LPCNO,Seminars
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