https://techmonitor.ai/hardware/quantum/first-quantum-communications-link-tested-between-uk-and-ireland

Bits of data secured using quantum cryptography have been sent from the UK to the Republic of Ireland for the first time in a new quantum communications test. Using a fibre optic cable -dubbed Rockabill - running under the Irish Sea, researchers were able to overcome long-standing data leakage issues with the technology thanks to sensitive detectors at the cable endpoint.

The fibre optic cable used by researchers from the University of York’s Institute for Safe Autonomy forms part of a new 224km network between Portrane in Ireland and Southport in the UK. It is owned and operated by infrastructure provider euNetworks and is one of the newest commercial optical fibre systems in the region.