Another enlightening point is that there is a significant loss in the optic fibers: > The whole process was horribly inefficient, with a success rate of 6.4 ×

Another enlightening point is that there is a significant loss in the optic fibers: > The whole process was horribly inefficient, with a success rate of 6.4 × 10−9, mostly because photons kept getting lost in the fiber optic cables. But, over the course of nine days, the setup managed to successfully entangle the nitrogen vacancies 245 times.