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!


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.


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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