Researchers in New York have developed a system that sends large numbers of entangled photons through commercial fiber optic cables with high fidelity, a crucial step for secure quantum networks. This breakthrough allows for continuous transmission of 20,000 entangled photons per second over a 34-km network for two weeks without frequent recalibrations. The team achieved an uptime of 99.84% and compensation fidelity of 99%. Their system compensates for disturbances in the photons’ polarization caused by stresses on the fiber optics. This innovation marks a significant advancement towards the commercialization of quantum networks and impresses experts in the field.
https://physics.aps.org/articles/v17/125