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Physicists at Ludwig Maximilian University (LMU), with colleagues at Saarland University, have demonstrated the transport of an entangled state between an atom and a photon via an optical fiber over a distance of up to 20 km. According to the researchers, this is a new record for distance traveled by an atom and a photonic channel in an entangled state — the previous record was 700 meters. “The experiment represents a milestone, insofar as the distance covered confirms that quantum information can be distributed on a large scale with little loss,” professor Harald Weinfurter said.
The researchers entangled a rubidium (Rb) atom with a photon. Following targeted excitation, the Rb atom emitted a photon with a…READ MORE