Cohen Eliahu
H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL UK.
Found Phys. 2017;47(10):1261-1266. doi: 10.1007/s10701-017-0107-2. Epub 2017 Jun 16.
Despite their important applications in metrology and in spite of numerous experimental demonstrations, weak measurements are still confusing for part of the community. This sometimes leads to unjustified criticism. Recent papers have experimentally clarified the meaning and practical significance of weak measurements, yet in Kastner (Found Phys 47:697-707, 2017), Kastner seems to take us many years backwards in the the debate, casting doubt on the very term "weak value" and the meaning of weak measurements. Kastner appears to ignore both the basics and frontiers of weak measurements and misinterprets the weak measurement process and its outcomes. In addition, she accuses the authors of Aharonov et al. (Ann Phys 355:258-268, 2015) in statements completely opposite to the ones they have actually made. There are many points of disagreement between Kastner and us, but in this short reply I will leave aside the ontology (which is indeed interpretational and far more complex than that described by Kastner) and focus mainly on the injustice in her criticism. I shall add some general comments regarding the broader theory of weak measurements and the two-state-vector formalism, as well as supporting experimental results. Finally, I will point out some recent promising results, which can be proven by (strong) projective measurements, without the need of employing weak measurements.
尽管弱测量在计量学中有重要应用且有众多实验证明，但仍有部分人对其感到困惑。这有时会导致不合理的批评。近期的论文已通过实验阐明了弱测量的含义和实际意义，然而在卡斯特纳（《发现物理》47:697 - 707，2017）的文章中，她似乎让我们在这场争论中倒退了许多年，对“弱值”这一术语以及弱测量的含义提出质疑。卡斯特纳似乎既忽视了弱测量的基础内容，也无视其前沿进展，并且错误解读了弱测量过程及其结果。此外，她在陈述中指责阿哈罗诺夫等人（《物理学年鉴》355:258 - 268，2015）的观点，而这些陈述与他们实际的观点完全相反。卡斯特纳和我们之间存在许多分歧点，但在这篇简短的回复中，我将暂且搁置本体论问题（这确实涉及解释层面，且远比卡斯特纳所描述的更为复杂），主要聚焦于她批评中的不合理之处。我还将对弱测量的更广泛理论和双态矢形式主义添加一些一般性评论，以及相关的支持性实验结果。最后，我将指出一些近期有前景的结果，这些结果可以通过（强）投影测量得到证明，而无需使用弱测量。
