Abstract
The validity of quantum-mechanical predictions has been confirmed with a high degree of accuracy in a wide range of experiments. Although the statistics of the outcomes of a measuring apparatus have been studied intensively, little has been explored and is known regarding the accessibility of quantum dynamics. For these sorts of fundamental studies of quantum mechanics, interferometry using neutron matter-waves in particular, provides almost ideal experimental circumstances. In this device quantum interference between spatially separated beams occurs on a macroscopic scale. Recently, the full determination of weak-values of neutrons 1 2 - spin adds a new aspect to the study of quantum dynamics. Moreover, a new counter-intuitive phenomenon, called quantum Cheshire Cat, is observed in an interference experiment. In this article, we present an overview of these experiments.
Highlights
Double-slit experiments, in particular with massive particles, demonstrate a major peculiarity of quantum mechanics
Our results show that weak measurements combined with neutron interferometry allows to demonstrate the quantum Cheshire Cat, where a property of a quantum system can behave as being spatially separated from the place of the particle’s presence
One cannot emphasize the importance of studies of quantum dynamics enough
Summary
Double-slit experiments, in particular with massive particles, demonstrate a major peculiarity of quantum mechanics. If one takes a look at the interference fringes in more detail, one notices a significant difference between interference outcomes due to classical and quantum consequences. That is, in the former, interference fringes are immediately visible. In the latter, only statistically distributed detection-spots appear at the first stage, and interference fringes can be recognized only after an accumulation of enough particles or rather detection-signals [1] These are the reasons why the double-slit experiment has been one of the best examples demonstrating the central mystery in quantum mechanics from the early stage of the development of quantum theory [2]
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