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arXiv quant-ph/0309144quant-ph
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量子自旋的空间局域化和相对论变换

Spatial Localization and Relativistic Transformation of Quantum Spins

Hui Li, Jiangfeng Du

摘要:

在静止坐标系中纯自旋的约化态的纯度很可能会降低,因为当被移动的观察者观察时,自旋和动量变得混合。我们表明,这种助推引起的自旋纯度下降,在一个移动的参考系中观察到的波包在休息帧中观察到的空间局域化属性是内在相关的。此外,我们还证明了,对于静止坐标系中自旋和动量可分离的定域纯态,从运动参考系看,其自旋约化密度矩阵不可避免地出现混合.

英文摘要:

The purity of a reduced state for spins that is pure in the rest frame will most likely appear to degrade because spin and momentum become mixed when viewed by a moving observer. We show that such a boost-induced decrease in spin purity observed in a moving reference frame is intrinsically related to the spatial localization properties of the wave package observed in the rest frame. Furthermore, we prove that, for any localized pure state with separable spin and momentum in the rest frame, its reduced density matrix for spins inevitably appears to be mixed whenever viewed from a moving reference frame.

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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