论文标题
崩溃动态是扩散的
Collapse dynamics are diffusive
论文作者
论文摘要
非接触测量实验已成功地用于约束自发波函数崩溃的模型，这预测了大型系统的量子叠加原理的违反。这些实验的基础是基于以下事实：根据这些模型，动力学是由噪声驱动的，除了使空间中的波函数崩溃，它还具有具有特征性特征的散射运动，尽管可以测试，但它可以测试。非接触方法似乎仅适用于那些通过嘈杂的动力学实现崩溃的模型，而不是任何模型，这些模型折叠了空间中的波函数。在这里，我们表明事实并非如此：在合理的假设下，任何崩溃的动态（在太空中）都是扩散的。具体而言，我们证明，任何符合无信号约束的空间变换不变动力学，如果在空间中崩溃的波函数，都必须改变系统的平均动量和/或其传播。
Non-interferometric experiments have been successfully employed to constrain models of spontaneous wave function collapse, which predict a violation of the quantum superposition principle for large systems. These experiments are grounded on the fact that, according to these models, the dynamics is driven by a noise that, besides collapsing the wave function in space, generates a diffusive motion with characteristic signatures, which, though small, can be tested. The non-interferometric approach might seem applicable only to those models which implement the collapse through a noisy dynamics, not to any model, which collapses the wave function in space. Here we show that this is not the case: under reasonable assumptions, any collapse dynamics (in space) is diffusive. Specifically, we prove that any space-translation invariant dynamics which complies with the no-signaling constraint, if collapsing the wave function in space, must change the average momentum of the system, and/or its spread.
