In an article from science alert:
Scientists have discovered a material that could create quantum optical computers
"The material is layered hexagonal boron nitride, which is a bit of a mouthful, but all you really need to know about it is that it's only one atom thick – just like graphene – and it has the ability to emit a single pulse of quantum light on demand at room temperature, making it ideal to help build a quantum optical computer chip."
http://www.sciencealert.com/scientists-have-discovered-a-material-that-could-create-quantum-optical-computers