Quantum physicists determine how to control two quantum light sources rather than one

https://phys.org/news/2023-01-quantum-physicists-sources.html

"colossal breakthrough enables quantum mechanical entanglement... also revealed key to scaling... using 20-30 entangled quantum light sources, potential to build universal error-corrected quantum computer, the holy grail... has made it necessary for researchers to develop extremely quiet nanochips and have precise control over each light source"