https://www.theregister.co.uk/2019/04/09/us_researchers_create_rackmounted_quantum_networking_hardware/

American researchers have managed to successfully transfer entangled photons over a fibre network stretching approximately 11 miles, marking the longest-distance quantum entanglement experiment to take place in the US.

This is not the largest quantum network ever – that honour belongs to a project in China – but what sets this latest effort apart is the development of portable quantum entanglement sources that fit into a standard server rack and are connected to traditional fibre distribution panels. Now, the same team is working on quantum repeaters that could help create much larger networks.