Kind of, quantum key exchange is based on the uncertainty principle. By encoding the key exchange in quantum properties of particles, any mitm observer will cha

Kind of, quantum key exchange is based on the uncertainty principle. By encoding the key exchange in quantum properties of particles, any mitm observer will change those properties, thus breaking the exchange. You don't need a quantum computer to do QKE, just the right kind of detector. There's already a bunch of people that do this without quantum computers.