Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement demonstration on board a nano-satellite   Global quantum networks for secure communication can be realised using large
fleets of satellites distributing entangled photon-pairs between ground-based
nodes. Because the cost of a satellite depends on its size, the smallest
satellites will be most cost-effective. This paper describes a miniaturised,
polarization entangled, photon-pair source operating on board a nano-satellite.
The source violates Bell's inequality with a CHSH parameter of 2.6 $\pm$ 0.06.
This source can be combined with optical link technologies to enable future
quantum communication nano-satellite missions.

4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess