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arXiv 2402.05352quant-ph
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主方程退纠缠的非线性泛函

Nonlinear functionals of master equation unravelings

Dustin Keys, Jan Wehr

AI总结:

本文研究主方程退纠缠轨迹的非线性泛函(方差和熵),利用伊藤公式计算泊松和维纳过程两类退纠缠的修正项,并证明熵修正为负,体现林德布拉德算子的局域化效应。

摘要:

退纠缠提供了主方程解的概率表示以及密度算子动力学计算方法。退纠缠生成的轨迹也可被视为真实的——如同随机坍缩模型中的情形。虽然退纠缠轨迹的线性泛函平均值可由主方程计算,但由于伊藤公式带来的非零期望值修正,非线性泛函的情况则不同。本文考虑两类非线性泛函:方差和熵。针对基于泊松过程和维纳过程的两种退纠缠类型,明确计算了这些修正。在熵的情形下,这些修正被证明为负值,表达了林德布拉德算子引入的局域化。

英文摘要:

Unravelings provide a probabilistic representation of solutions of master equations and a method of computation of the density operator dynamics. The trajectories generated by unravelings may also be treated as real -- as in the stochastic collapse models. While averages of linear functionals of the unraveling trajectories can be calculated from the master equation, the situation is different for nonlinear functionals, thanks to the corrections with nonzero expected values, coming from the Itô formula. Two types of nonlinear functionals are considered here: variance, and entropy. The corrections are calculated explicitly for two types of unravelings, based on Poisson and Wiener processes. In the case of entropy, these corrections are shown to be negative, expressing the localization introduced by the Lindblad operators.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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