  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.
