Monte Carlo wavefunction approach to the dissipative quantum-phase
dynamics of two-component Bose-Einstein condensates |
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Authors: | M Nakano S Ohta R Kishi H Takahashi S Furukawa |
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Institution: | (1) Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan |
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Abstract: | 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., Schr?dinger 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 Schr?dinger cat state and the Pegg-Barnett phase-difference
distribution between the two components for a small-size Schr?dinger cat
state, one- and three-body loss effects are not shown to directly depend on
the size of Schr?dinger cat state. In contrast, the pure-phase
relaxation effects, causing a reduction of phase-difference distribution and
then decaying the Schr?dinger cat state, significantly increase with the
increase of the size of Schr?dinger cat state. These features suggest
that a detection of damped collapse-revival behavior is highly possible for
medium-size Schr?dinger cat states in small-size two-component BECs. |
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Keywords: | 03 75 Gg Entanglement and decoherence in Bose-Einstein condensates 03 75 Mn Multicomponent condensates spinor condensates 03 75 Kk Dynamic properties of condensates collective and hydrodynamic excitations superfluid flow 03 67 Mn Entanglement production characterization and manipulation |
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