Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atom-interferometric test of the universality of gravitational redshift
  and free fall   Light-pulse atom interferometers constitute powerful quantum sensors for
inertial forces. They are based on delocalised spatial superpositions and the
combination with internal transitions directly links them to atomic clocks.
Since classical tests of the gravitational redshift are based on a comparison
of two clocks localised at different positions under gravity, it is promising
to explore whether the aforementioned interferometers constitute a competitive
alternative for tests of general relativity. Here we present a specific
geometry which together with state transitions leads to a scheme that is
concurrently sensitive to both violations of the universality of free fall and
gravitational redshift, two premises of general relativity. The proposed
interferometer does not rely on a superposition of internal states, but merely
on transitions between them, and therefore generalises the concept of physical
atomic clocks and quantum-clock interferometry. An experimental realisation
seems feasible with already demonstrated techniques in state-of-the-art
facilities.

20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph