Statut  Confirmé 
Série  LPENSMDQ 
Domaines  condmat 
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 nonlinearity and versatility, Josephson junction metamaterials constitute a promising platform to explore a large class of physical phenomena, from quantum phase transitions to nonlinear quantum optics in the microwave domain. In this talk I will discuss two recent experiments. First, I will report on the measurement of a fullytunable 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 nonperturbative renormalization of the Josephson energy or manybody dissipation. It is interesting to note that, in some parameter ranges, the explanation of our data exceeds the capabilities of the most advanced manybody numerical techniques. Then, I will discuss our observation of quantized current steps in the currentvoltage characteristic of these Josephson junction metamaterials and their interpretation in the context of Bloch oscillations and quantum metrology. 
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