Ultracold dipolar gas in an optical lattice: The fate of metastable states

Year: 2008

Authors: Trefzger C., Menotti C., Lewenstein M.

Autors Affiliation: ICFO Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain;
CRS BEC-INFM and Dipartimento di Fisica, Universita’ di Trento, I-38050 Povo, Italy;
ICREA Instituci Catalana de Recerca i Estudis Avancats and ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain

Abstract: We study the physics of ultracold dipolar bosons in optical lattices. We show that dipole-dipole interactions lead to the appearance of many insulating metastable states. We study the stability and lifetime of these states using a generalization of the instanton theory. We also investigate possibilities to prepare, control, and manipulate these states using time-dependent superlattice modifications and modulations. We show that the transfer from one metastable configuration to another necessarily occurs via superfluid states, but can be controlled fully at the quantum level. We show how the metastable states can be created in the presence of a trapping potential. Our findings open the way toward applications of the metastable states as quantum memories.

Journal/Review: PHYSICAL REVIEW A

Volume: 78 (4)      Pages from: 043604-1  to: 043604-14

More Information: We would like to thank Sibylle Braungardt, Thierry Lahaye, Tillman Pfau, Luis Santos, Mirta Rodriguez, and Peter Zoller for useful discussions. We acknowledge financial support of ESF PESC \”QUDEDIS,\” EU IP \”SCALA,\” Spanish \” MICINN,\” under Contract No. FIS2005-04627 and Consolider-Ingenio 2010. C. T. acknowledges the support by the Commission for Universities and Research of the Department of Innovation, Universities and Enterprises of the Catalan Government and the European Social Fund. C. M. acknowledges financial support by the EU through an EIF Marie-Curie Action.
DOI: 10.1103/PhysRevA.78.043604

Citations: 46
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