量子光学的经典极限:不是乍看之下的样子
The classical limit of quantum optics: not what it seems at first sight
摘要:
什么是光以及如何描述它一直是物理学的中心课题。随着我们的理解的增加,我们的理论也发生了变化:几何光学、波动光学和量子光学都是越来越复杂的描述,每一种都涉及比其前身更大的一类现象。但这些理论到底有什么联系呢?波动光学如何以及何时归结为几何光学是一个相当简单的问题。同样,量子光学如何简化为波动光学也被认为是一件非常简单的事情。不是这样的正如我们在这里所展示的,量子光学的经典极限是一个复杂得多的问题;事实上,它的复杂性要大得多,需要我们对所有的直觉进行彻底的修正。修正后的直觉可以作为寻找新的量子效应的指南。
英文摘要:
What is light and how to describe it has always been a central subject in physics. As our understanding has increased, so have our theories changed: Geometrical optics, wave optics and quantum optics are increasingly sophisticated descriptions, each referring to a larger class of phenomena than its predecessor. But how exactly are these theories related? How and when wave optics reduces to geometric optics is a rather simple problem. Similarly, how quantum optics reduces to wave optics has been considered to be a very simple business as well. It's not so. As we show here the classical limit of quantum optics is a far more complicated issue; it is in fact dramatically more involved and it requires a complete revision of all our intuitions. The revised intuitions can then serve as a guide to finding novel quantum effects.
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