Séminaire Général de Physique

"Séminaire Général de Physique"

AMPHI PGG
(café à partir de 10h10)

A l'amphithéâtre Pierre-Gilles de Gennes
Bâtiment Condorcet, niveau -1

Prochain séminaire :  Zaki Leghtas (LPENS)  - Vendredi 11 octobre 2024

Titre : Vers l'ordinateur quantique : un qubit de chat de Schrödinger à long temps de vie

Résumé :

Quantum computers might be capable of solving computational problems that are intractable to classical computers. Common examples are the simulation of chemical reactions or exotic materials. In the last two decades, the progress towards building a quantum computer has been outstanding. In the early 2000s, physicists were learning how to build and control single quantum bits : the elementary system that encodes a single bit of quantum information, also known as "qubit". In 2024, chips of hundreds of qubits are now available, that even outperform classical computers on very specific tasks. In this seminar, I will describe the hopes and challenges in building a quantum computer. I will delve into a particularly successful platform for quantum computing, known as superconducting circuits. Finally, I will describe some of my own research on constructing a "Schrödinger cat-qubit", a promising candidate for universal quantum computing [Nature 629 778-783 (2024)].

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Rendez-vous pour le café à partir de 10h10 :
Bâtiment Condorcet - Espace de convivialité du niveau -1 (en bas de l'escalier à vis)
10, rue Alice Domon et Léonie Duquet
Université Paris Cité - UFR de Physique Paris 13ème

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Dernier séminaire :  Catherine Villard (LIED - UPC-CNRS) - Vendredi 21 juin 2024

Titre : Helical fungi under physical constraints

Résumé :

Helical filaments are represented in living organisms from the molecular to the multi-cellular scale. Described by Darwin in aerial and underground parts of plants as early as the 19th century, they still raise fundamental questions about their roles and their underlying mechanisms. We here focus on the helicity of the filaments (hyphae) of Fungi, taking as an example the fungus Candida albicans, an opportunistic pathogen of humans.
The question guiding us in the ANR HelPath project involving the Institut Pasteur (S.BB) and the Institut Charles Sadron in Strasbourg (Igor Kulic) is the link between virulence and helicity. I will present how this question has led us to use the concept of squeelix ("squeezedhelix") developed by Igor Kulic and coll. to understand and model the oscillatory behavior of hyphae under z confinement provided by microfluidic channels.
To evaluate the possible advantages of these oscillatory growth modalities in the colonization of complex environments, we also challenge the path finding properties of hyphae within micro-pillar arrays. Strikingly, hyphae use a logic pattern to invade such structured spaces, highlighting an elementary sense of proprioception in these filamentous organisms.

Lors des derniers Séminaires Généraux de Physique nous ravons reçu :

• 24 novembre 2023 : Alexandre Le Tiec (LUTH, Observatoire de Paris)
• 22 décembre 2023 : Mathilde Badoual (IJCLab, Université Paris Saclay)
• 26 janvier 2024 : Joël Laillier et Christian Topalov (CMH, EHESS)
• 1er mars 2024 : François Forget (LMD, Institut P.S. Laplace)
• 5 avril 2024 : Alain Aspect (LCF, Université Paris Saclay)
• 21 juin 2024 : Catherine Villard (LIED, Université Paris Cité)

L'équipe du séminaire Général : Edouard Boulat, Alexis Coleiro, Cassandra Mercier, Charlotte Py

Archives des anciens séminaires