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Partial entropy change and entanglement in the mixed state for a Jaynes-Cummings model with Kerr medium 下载免费PDF全文
By using the algebraic dynamical approach, an atom--field
bipartite system in mixed state is employed to investigate the
partial entropy change and the entanglement in a cavity filled with
Kerr medium. The effects of different nonlinear intensities are
studied. One can find that the Kerr nonlinearity can reduce the
fluctuation amplitudes of the partial entropy changes and the
entanglement of the two subsystems, and also influence their
periodic evolution. Meanwhile, increasing the Kerr nonlinear
strength can convert the anti-correlated behaviour of the partial
entropy change to the positively correlated behaviour. Furthermore,
the entanglement greatly depends on the temperature. When the
temperature or the nonlinear intensity increases to a certain value,
the entanglement can be suppressed greatly. 相似文献
2.
In this paper, with the full field operator \hat ψ
expressed in terms of a particle-number-conserving mean-field ansatz,
we investigate the dynamical behaviour of Bose--Einstein condensates
from microscopic physics. Including the first-order term
correction from single-particle excitation and the remaining
higher-order term correction from collective excitations
simultaneously, we obtain the formulation for a closed local
expression of quantum backreaction Q, and discuss the influence on
static Bose--Einstein condensates. Even though the quantum
backreaction is small, it still has some influence on its dynamics. 相似文献
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