[Todos] HOY - Coloquios DF: Cristian Urbina (CEA-CNRS): 14hs, Aula Seminario, 2do piso, Pab. I

[Augusto Roncaglia]

 COLOQUIOS DEL DEPARTAMENTO DE F�SICA FCEYN - UBA


              En el Aula Seminario, 2do piso, Pab. I,

              Jueves 14/8, 14hs:

              CRISTIAN URBINA

              CEA-CNRS


           *   Manipulating the quantum state of a single cooper pair in a
one-atom contact*

Nowadays experiments with Josephson circuits that behave as artificial
atoms rival and even surpass their atomic physics counterparts.
Nevertheless, these circuits exploit only partially the richness of the
Josephson effect, as they overlook the existence of an internal, spin-like
degree freedom, inherent to all Josephson structures. We spotlight this
pseudospin with experiments on the simplest Josephson weak-link: a one-atom
contact between two superconductors. The pseudospin represents here the two
possible states of a Cooper pair localized around the contact. We will
describe in particular experiments in which the atomic contact is coupled
to a microwave resonator and show the coherent manipulation of the quantum
state of the pseudospin, illustrated by Rabi oscillations and Ramsey
fringes, as done for atoms and qubits.
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