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Claude Cohen Tannoudji

Prix Nobel en 1997 pour le ralentissement et le piégeage des atomes par la lumière laser.

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Accueil du site > Séminaires > LKB > Superadiabatic Quantum Control tested on a Bose-Einstein condensate

Superadiabatic Quantum Control tested on a Bose-Einstein condensate

Séminaire de Ennio Arimondo, Università di Pisa.

Lundi 26 mars à 11h30 Salle de Conférence IV Département de Physique de l’ENS
24 rue Lhomond 75005 Paris

We have explored and driven the temporal quantum evolution of a Bose-Einstein condensate within a one-dimensional optical lattice under the application of various accelerations. The avoided energy crossing at the edge of the Brillouin zone is treated as an effective two-level quantum system. The optical lattices parameters were perfectly controlled both statically and dynamically. As part of the quantum control, it is usually necessary to realize the quantum manipulation in the shortest possible time in order to minimize decoherence, and with a large stability against fluctuations of the control parameters.

We have implemented optimal control schemes that achieve nearly perfect fidelity for our system. By suitably tailoring the time-dependence of the system’s parameters, an initial quantum state can be transformed into a desired final state through a short-cut protocol reaching the maximum speed compatible with the laws of quantum mechanics. In the opposite limit the transitionless superadiabatic protocols in which the system perfectly follows the nstantaneous adiabatic ground state can be implemented. These superadiabatic protocols are extremely robust against parameter variations.


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