1999/05/31 by Augusto Smerzi, S. Raghavan, Srikanth Raghavan · 74 citations
Physics and Astronomy · #Amplitude #Bose–Einstein condensate #Coherence (philosophical gambling strategy) #Cold Atom Physics and Bose-Einstein Condensates #Josephson effect #Observable #Oscillation (cell signaling) #Physics #Quantum #Quantum dynamics #Quantum electrodynamics #Quantum fluctuation #Quantum mechanics #Quantum, superfluid, helium dynamics #Strong Light-Matter Interactions #Superconductivity #Superfluidity #cond-mat.mes-hall #cond-mat.soft #cond-mat.stat-mech #cond-mat.supr-con
paper · pdf · doi:10.1103/physreva.61.063601
published in Physical Review A 61(6) (American Physical Society) · Submitted
arxiv created 1999/07/12 · openalex publication_date 2000/05/04 · arxiv updated 2016/08/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study analytically the quantum corrections to the Gross-Pitaevskii equation for two weakly linked Bose-Einstein condensates. The goals are (1) to investigate dynamical regimes at the borderline between the classical and quantum behavior of the bosonic field, and (2) to search macroscopic quantum coherence phenomena not observable with other superfluid/superconducting systems. Quantum fluctuations renormalize the classical Josephson oscillation frequencies. Large amplitude phase oscillations are modulated, exhibiting collapses and revivals. We describe an interwell oscillation mode with a vanishing (ensemble averaged) mean value of the observables, but with oscillating mean square fluctuations. We finally discuss the limit in which the classical Gross-Pitaevskii (Josephson) dynamics is recovered.