Fast Optimal Frictionless Atom Cooling in Harmonic Traps: Shortcut to Adiabaticity
Xi ChenDepartamento de Química-Física, UPV-EHU, Apartado 644, 48080 Bilbao, SpainA. RuschhauptInstitut für Theoretische Physik, Leibniz Universität Hannover, Appelstraβe 2, 30167 Hannover, GermanySebastian SchmidtInstitut für Theoretische Physik, Leibniz Universität Hannover, Appelstraβe 2, 30167 Hannover, GermanyAdolfo del CampoQOLS, Blackett Laboratory, Imperial College, Prince Consort Road, SW7 2BW London, United KingdomDavid Guéry-OdelinLaboratoire Collisions Agrégats Réactivité, CNRS UMR 5589, IRSAMC, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex 4, FranceJ. G. MugaDepartamento de Química-Física, UPV-EHU, Apartado 644, 48080 Bilbao, Spain
2010en
ABI
Аннотация
A method is proposed to cool down atoms in a harmonic trap without phase-space compression as in a perfectly slow adiabatic expansion, i.e., keeping the same populations of instantaneous levels in the initial and final traps, but in a much shorter time. This may require that the harmonic trap become transiently an expulsive parabolic potential. The cooling times achieved are shorter than those obtained using optimal-control bang-bang methods and real frequencies.
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