QM Talks@CBPF: Bruno Juliá-Díaz — 28.04, 16h

Update (29.04.14): Here are the slides from the excellent talk given by Bruno. Lot’s of results and new ideas to work on!

bjulia-cbpf

Bruno, thank you for your talk and visit!

—————————————-
Our next QM Talk@CBPF will be given by Bruno Juliá-Diaz, from the University of Barcelona. Bruno is currently visiting the qig@CBPF, more specifically he is collaborating with Itzhak Roditi, and will stay here up to 05.05. You can find the details of his talk below.

See you there!

Speaker: Bruno Juliá-Diaz (U. Barcelona)

Coordinates: auditorium 5th floor, CBPF. 28.04, 16h

Title: Bosonic Josephson junctions: Spin-squeezing, fragmentation and shortcuts to adiabaticity

Abstract: I will consider a gas of ultracold atoms at zero temperature trapped in a double-well potential. In the simplest case the system can be described using just two modes. I ll go through the different quantum many-body correlations present in the ground state of the system depending on the character of the atom-atom interactions.
Afterwards, I ll discuss the presence of pseudo-spin squeezed states in the spectrum and a way to produce them in fast times using a protocol to shortcut the adiabatic following useful for the Hamiltonian describing the system.

References:

Shortcut to adiabaticity in internal bosonic Josephson junctions
A. Yuste, B. Juliá-Díaz, E. Torrontegui, J. Martorell, J. G. Muga, A. Polls
Phys. Rev. A 88, 043647 (2013)

Dynamic generation of spin-squeezed states in bosonic Josephson junctions
B. Juliá-Díaz, T. Zibold, M. K. Oberthaler, M. Melé-Messeguer, J. Martorell, A. Polls
Phys. Rev. A 86, 023615 (2012)

Macroscopic self trapping in BECs: analysis of a dynamical quantum phase transition
B. Julia-Diaz, D. Dagnino, M. Lewenstein, J. Martorell, A. Polls
Phys. Rev. A 81, 023615 (2010)

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