English News

Quantum cryptography can go the distance

Date: 2009-01-07

Nature News, Geoff Brumfiel, August 27, 2008


…Long-distance runaround
Now Chen and his colleagues have found a way to extend the entangled photons reach. Instead of photons,
communication begins with two clouds of rubidium atoms: one by the sender and the other acting as a staging  post on the way to the receiver. Stimulating these atoms makes them each release a photon, which remains  entangled with its parent cloud.…