https://www.sciencedaily.com/releases/2018/10/181029130942.htm

Now, researchers at Stevens Institute of Technology and Columbia University have developed a scalable method for creating large numbers of these quantum light sources on a chip with unprecedented precision that not only could pave the way for the development of unbreakable cryptographic systems but also quantum computers that can perform complex calculations in seconds that would take normal computers years to finish.

"The search for scalable quantum light sources has been going on for 20 years, and more recently has become a national priority," says Stefan Strauf, who led the work and is also director of Stevens' Nanophotonic Lab. "This is the first time anyone has achieved a level of spatial control combined with high efficiency on a chip that is scalable, all of which are needed to realize quantum technologies."