Bistability and macroscopic quantum coherence in a Bose-Einstein condensate of Li-7
Anno: 2002
Autori: Montina A., Arecchi F.T.
Affiliazione autori: Dipartimento di Fisica, Università di Pisa, Via F. Buonarroti 2, 56127 Pisa, Italy;
Dipartimento di Fisica, Università di Firenze;
Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy
Abstract: We consider a Bose-Einstein condensate of Li-7 in a situation where the density undergoes a symmetry breaking in real space. This occurs for a suitable number of condensed atoms in a double-well potential, obtained by adding a standing-wave light field to the trap potential. Evidence of bistability results from the solution of the Gross-Pitaevskii equation. By second quantization, we show that the classical bistable situation leads, in fact, to a macroscopic quantum superposition or Schrodinger cat (SC) and evaluate the tunneling rate between the two SC states. The oscillation between the two states is called macroscopic quantum coherence (MQC); we study the effects of losses on MQC.
Giornale/Rivista: PHYSICAL REVIEW A
Volume: 66 (1) Da Pagina: 013605-1 A: 013605-8
Parole chiavi: ATTRACTIVE INTERACTIONS; ATOMS; GASDOI: 10.1103/PhysRevA.66.013605Citazioni: 13dati 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