Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observations of on-demand quantum correlation using Poisson-distributed
  photon pairs   Complementarity or wave-particle duality has been the basis of quantum
mechanics over the last century. Since the Hanbury Brown and Twiss experiments
in 1956, the particle nature of single photons has been intensively studied for
various quantum phenomena such as anticorrelation and Bell inequality
violation. Regarding the fundamental question on quantumness or
nonclassicality, however, no clear answer exists for what quantum entanglement
should be and how to generate it. Here, we experimentally demonstrate the
secrete of quantumness using the wave nature of single photons.

7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an