Ciampini, Donatella and Morsch, Oliver and Arimondo, Ennio (2011) Experimental investigation of tunneling times using Bose-Einstein condensates. Journal of physics: conference series . ISSN 1742-6596
Full text not available from this repository.Abstract
The time it takes a quantum system to complete a tunneling event (which in the case of cross-barrier tunneling can be viewed as the time spent in a classically forbidden area) is related to the time required for a state to evolve to an orthogonal state, and an observation, i.e., a quantum mechanical projection on a particular basis, is required to distinguish one state from another. We have performed time-resolved measurements of Landau-Zener tunneling of Bose-Einstein condensates in accelerated optical lattices, clearly resolving the steplike time dependence of the band populations. The use of different protocols enabled us to access the tunneling probability, in two different bases, namely, the adiabatic basis and the diabatic basis. The adiabatic basis corresponds to the eigenstates of the lattice, and the diabatic one to the freeparticle momentum eigenstates. Our findings pave the way towards more quantitative studies of the tunneling time for LZ transitions, which are of current interest in the context of optimal quantum control and the quantum speed limit.
Item Type: | Article |
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Additional Information: | Imported from arXiv |
Subjects: | Area02 - Scienze fisiche > FIS/03 - Fisica della materia |
Divisions: | Dipartimenti (until 2012) > DIPARTIMENTO DI FISICA " E. FERMI" |
Depositing User: | dott.ssa Sandra Faita |
Date Deposited: | 07 Apr 2015 17:37 |
Last Modified: | 07 Apr 2015 17:37 |
URI: | http://eprints.adm.unipi.it/id/eprint/1365 |
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