Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum bouncer: theory and experiment   The quantum bouncer (QB) concept is a known QM textbook example of confined
particle, namely, a solution to the 1D Schroedinger equation for a linear
potential (the so-called Airy equation). It would be a great methodological
challenge to create such a QM object in laboratory. An attempt of observation
of the QB ``running'' in the horizontal direction was recently made by the
international team at the Laue-Langevin Institute, Grenoble. The experiment was
performed with ultra-cold neutrons. In this paper, the experiment is analyzed
in view of the authors' claim that ``neutron quantum states in Earth
gravitational field'' are observed. The experimental apparatus is designed for
measurements of horizontal flux of neutrons passing through an absorbing wave
guide with a variable height of absorber. From our analysis, it follows,
however, that in such a layout measured data are not sensitive to quantum
probability density in the vertical direction. The overall conclusion is made
that the experimental data do not contain sufficient information to justify the
claim.

27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph