Sending Quantum Messages Through Space


Fragile photon states useful for quantum communication can be faithfully transmitted and distinguished over a link between an orbiting satellite and a telescope on Earth.

Paolo Villoresi and colleagues at the University of Padova in Italy report [1] that photons—acting as carriers of quantum information—preserve their state, on which such information is encoded, even after having been reflected by satellites located more than a thousand kilometers away from Earth. Read more at