BBC:
Canada has invested $2.7m (£1.93m) into developing quantum radar – a new technology that would greatly improve the detection of stealth aircraft.
The technology is being developed by the University of Waterloo to replace existing Arctic radar stations.
Quantum radar can theoretically detect objects with a greater level of accuracy than conventional radar.
It makes use of quantum illumination – the process of isolating pairs of entangled photons.
So far, the technology has been tested only in laboratories.
Canada and the US jointly maintain 54 North Warning System (NWS) radar stations in the Arctic, which act as the first line of early warning atmospheric air defence for North America.
These radar stations are approaching the end of their life spans, and could need to be replaced as early as 2025.
Several other countries are also interested in developing quantum radar, including China and Russia…
