Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A proof-of-principle quantum-optical experiment challenging the import
  of the 'no-signaling' theorem   We present, and mathematically describe, a proof-of-principle quantum-optical
experiment that seemingly enables superluminal signaling, contrary to the
import of the 'no-signaling' theorem.

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex