TY - JOUR
T1 - Monte Carlo wavefunction approach to the dissipative quantum-phase dynamics of two-component Bose-Einstein condensates
AU - Nakano, M.
AU - Ohta, S.
AU - Kishi, R.
AU - Takahashi, H.
AU - Furukawa, S.
PY - 2006/6/1
Y1 - 2006/6/1
N2 - We investigate the relaxation effects on the dynamics of two-component dilute gas Bose-Einstein condensates (BEC) with relatively different two-body interactions and Josephson couplings between the two components. Three types of relaxation effects, i.e., one- and three-body losses and a pure phase relaxation caused by elastic two-body collision between condensed and noncondensed atoms, are examined on the dynamical behavior of a macroscopic superposition, i.e., Schrödinger cat state, of two states with atom-number differences between the two components, which is known to be created by the time evolution in certain parameter regimes. Although three-body losses show a relatively large suppression of the revival behavior- of Schrödinger cat state and the Pegg-Barnett phase-difference distribution between the two components for a small-size Schrödinger cat state, one- and three-body loss effects are not shown to directly depend on the size of Schrödinger cat state. In contrast, the pure-phase relaxation effects, causing a reduction of phase-difference distribution and then decaying the Schrödinger cat state, significantly increase with the increase of the size of Schrödinger cat state. These features suggest that a detection of damped collapse-revival behavior is highly possible for medium-size Schrödinger cat states in small-size two-component BECs.
AB - We investigate the relaxation effects on the dynamics of two-component dilute gas Bose-Einstein condensates (BEC) with relatively different two-body interactions and Josephson couplings between the two components. Three types of relaxation effects, i.e., one- and three-body losses and a pure phase relaxation caused by elastic two-body collision between condensed and noncondensed atoms, are examined on the dynamical behavior of a macroscopic superposition, i.e., Schrödinger cat state, of two states with atom-number differences between the two components, which is known to be created by the time evolution in certain parameter regimes. Although three-body losses show a relatively large suppression of the revival behavior- of Schrödinger cat state and the Pegg-Barnett phase-difference distribution between the two components for a small-size Schrödinger cat state, one- and three-body loss effects are not shown to directly depend on the size of Schrödinger cat state. In contrast, the pure-phase relaxation effects, causing a reduction of phase-difference distribution and then decaying the Schrödinger cat state, significantly increase with the increase of the size of Schrödinger cat state. These features suggest that a detection of damped collapse-revival behavior is highly possible for medium-size Schrödinger cat states in small-size two-component BECs.
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U2 - 10.1140/epjd/e2006-00049-7
DO - 10.1140/epjd/e2006-00049-7
M3 - Article
AN - SCOPUS:33646483532
VL - 38
SP - 523
EP - 532
JO - European Physical Journal D
JF - European Physical Journal D
SN - 1434-6060
IS - 3
ER -