Quantum computers have nothing to do with QKD as far as I know. Instead you need things like this : https://www.toshiba.eu/eu/Cambridge-Research-Laboratory/Quan

Quantum computers have nothing to do with QKD as far as I know. Instead you need things like this : https://www.toshiba.eu/eu/Cambridge-Research-Laboratory/Quantum-Information/Quantum-Key-Distribution/Toshiba-QKD-system/ https://www.toshiba.eu/eu/Cambridge-Research-Laboratory/Quan... Which detect photon's one at a time (also there is spitting out of photons via lasers) The idea is that you have an infallible alarm for when the optics have been tapped, which means that you can then send lots of symmetric keys and know that they can't be intercepted (provided you are only sending them ~50km. So it's nothing to do with cryptography (really) either - which explains why cryptographers aren't that interested in it. Also it's not a fugazzi as there are several working testbeds in the wild.