The move is important because it moves humanity one stage close to building a quantum internet which is a good thing as it is only potentially on and off.
While other scientists have worked on similar projects, this group is the first to beam quantum information across such a great distance. They did it over two separate networks and with a fidelity greater than 90 percent and used "off-the-shelf" components using tech is compatible with existing telecommunications equipment.
In PRX Quantum, which should be delivered and has already been delivered, they say their work provides "a realistic foundation for a high-fidelity quantum Internet with practical devices".
They wrote: "This is a key achievement on the way to building a technology that will redefine how we conduct global communication."
Experts believe a quantum internet could revolutionise a variety of computing fields, including cryptography and search. With two 13-mile networks under their belts, the Caltech and Fermilab teams plan to build a city-scale network called the Illinois Express Quantum Network in Chicago next.