DIY Single Photon Generator

Photons usually come in packs. Single Photons are cool. Where to get them?

Seeing low light:

Of cones and rods:
http://math.ucr.edu/home/baez/physics/Quantum/see_a_photon.html

Neuroscience: Humans can detect single photonsAdd:
http://www.natureasia.com/en/research/highlight/10786

Literature:
https://www.amazon.com/Single-photon-Devices-Applications-Charles-Santori/dp/352740807X
https://www.lap-publishing.com/catalog/details//store/gb/book/978-3-659-50846-2/towards-single-photon-sources
http://www.photonicsolutions.co.uk/company.php?comp=5765
http://www.micro-photon-devices.com/Products/Photon-Counters/InGaAs-InP

Papers:
http://www.sciencedirect.com/science/article/pii/S0168900214014041