Bistability and macroscopic quantum coherence in BECs: the two cases of attractive and repulsive interactions
Anno: 2002
Autori: Montina A., Arecchi F.T.
Affiliazione autori: Univ. di Pisa, Dip. di Fisica, Via F. Buonarroti 2, Pisa, Italy;
Univ. di Firenze, Dip. di Fisica, Italy;
Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy
Abstract: We consider Bose-Einstein condensates (BECs) in situations where the density undergoes a symmetry breaking, either in real space or in momentum space. This occurs for a suitable number of condensed atoms in a double well potential, obtained in real space for a BEC of lithium atoms by adding a standing wave light field to the trap potential, or in momentum space for rubidium atoms by Raman coupling two BECs in different magnetic states with two tilted light fields. Evidence of bistability results from the solution of the Gross-Pitaevskii equation. By second quantization, we show that the classical bistable situation is in fact a Schrodinger cat (SC) and we evaluate the macroscopic quantum coherence between the two SC states.
Giornale/Rivista: JOURNAL OF MODERN OPTICS
Volume: 49(1/2) Da Pagina: 319 A: 331
Parole chiavi: BOSE-EINSTEIN CONDENSATIONDOI: 10.1080/09500340110077562Citazioni: 3dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-12Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui