Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines cond-mat
Date Lundi 28 Mars 2022
Heure 13:30
Institut LPENS
Salle L378
Nom de l'orateur Roch
Prenom de l'orateur Nicolas
Addresse email de l'orateur
Institution de l'orateur Institut Néel, Grenoble
Titre Josephson junction metamaterials: quantum simulation and metrology
Résumé Given their weak dissipation, large non-linearity and versatility, Josephson junction metamaterials constitute a promising platform to explore a large class of physical phenomena, from quantum phase transitions to non-linear quantum optics in the microwave domain. In this talk I will discuss two recent experiments. First, I will report on the measurement of a fully-tunable model system where a long chain of several thousands linear Josephson elements, acting as a strongly dissipative environment, is terminated by a small Josephson junction endowed with a strong non- linearity, acting as a single impurity. Using this quantum simulator we could test predictions of the Boundary Sine Gordon model, including non-perturbative renormalization of the Josephson energy or many-body dissipation. It is interesting to note that, in some parameter ranges, the explanation of our data exceeds the capabilities of the most advanced many-body numerical techniques. Then, I will discuss our observation of quantized current steps in the current-voltage characteristic of these Josephson junction metamaterials and their interpretation in the context of Bloch oscillations and quantum metrology.
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