Kevin Vynck

Author's posts

Café Entrepreneurial à l’IOA – Jeudi 24 Mars de 12h30 à 14h30

Les étudiants de la Filière Innovation Entrepreneurs (FIE) de l’Institut d’Optique Graduate School ont le plaisir de vous inviter à prendre un café le jeudi 24 mars dans le hall de l’IOA.

 

Ils vous attendrons de 12h30 à 14h30 pour vous présenter leur projet de start-up innovante et discuter avec vous des opportunités de leurs idées ! Passez les challenger, ils seront ravis de discuter avec vous !

 

Pour venir découvrir leurs projets, rien de plus simple. Inscrivez-vous sur le lien suivant: http://www.eventbrite.com/e/cafe-entrepreneurial-ioa-tickets-23043120594
L’inscription est gratuite et rapide.

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Lecture series on “Macroscopic quantum phenomena in Josephson junctions (and related structures)” by Dr. Edward Goldobin


Lecture series on « Macroscopic quantum phenomena in Josephson junctions (and related structures) » by Dr. Edward Goldobin (University of Tübingen, Germany)

 

Date: March 10th, 24th and 31th 2016 at 2.00 pm
Location: A1 room, Institut d’Optique d’Aquitaine, rue François Mitterrand, 33400 Talence

 

Abstract:

Although Josephson junction are already quantum mechanical devices, their behavior is often described by the classical equations, which link, for example, the supercurrent through the junction with the phase across it. However, in certain conditions, these macroscopic variables can again exhibit quantum mechanical properties. For example, the phase across the junction may be not well defined, but smeared and described by a probability cloud in a quantum mechanical sense. Then it can also tunnel through the barrier from one state to the other or even form a coherent superposition of these two states.

During the last 15 years enormous progress was achieved in the field of macroscopic quantum effects, in particular, using Josephson junctions. Several types of qubits – coherent quantum mechanical two-level systems – were experimentally demonstrated by different groups. Decoherence, which spoils coherent quantum evolution, was drastically reduced allowing many quantum operations to be performed coherently in a row.

In these lectures, I will introduce the basic concepts and will show how one can build simple qubits and perform trivial quantum manipulations/computations, on the basis of Josephson junctions. These lectures will be structured in four chapters:

  1. From single Josephson junction to phase-qubit
  2. From single electron tunneling to charge-qubit
  3. Cavity and Circuit QED
  4. Fractional flux quanta in novel Josephson devices

Publication in Physical Review Letters: « Direct Evidence of Flexomagnetoelectric Effect Revealed by Single-Molecule Spectroscopy »

img_lounis_1015Physicists have for the first time demonstrated the possibility to create an electric polarizability from a magnetic field inhomogeneity. To this aim, they have employed an imaging technique using single molecules as local nanoprobes of the electric field.

 

I. S. Veshchunov, S. V. Mironov, W. Magrini, V. S. Stolyarov, A. N. Rossolenko, V. A. Skidanov, J.-B. Trebbia, A. I. Buzdin, Ph. Tamarat et B. Lounis, Direct Evidence of Flexomagnetoelectric Effect Revealed by Single-Molecule Spectroscopy, Physical Review Letters 115, 027601 (2015). (link)

 

See also the news from the Institut de Physique (in french): http://www.cnrs.fr/inp/spip.php?article4055