In this paper, it is proposed to improve the quality of a variational description of a closed quantum system by adding fictitious dissipation that reduces the entanglement. The proposal is implemented for a small Bose-Hubbard chain in the mean field regime, which shows chaotic behavior and associated fast growth of quantum fluctuations. For appropriately chosen dissipation, good agreement with the truncated Wigner approximation is found. This shows that, when chaos leads to the breakdown of a variational method, adding fictitious dissipation can be a cure.

中文翻译：

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封闭系统变分描述的量子轨迹：高斯态的案例研究

在本文中，提出了通过增加减少纠缠的虚拟耗散来提高封闭量子系统的变分描述的质量。该建议是针对均值场态中的小玻色-哈伯德链实施的，该链显示出混沌行为以及相关的量子涨落的快速增长。对于选择适当消散，随着截断维格纳近似一致被发现。这表明，当混乱导致变分方法崩溃时，增加虚拟耗散可以解决问题。