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Orsay (France) -Quantum communication still suffers from the drawback that it only works over limited distances. Quantum repeaters could tackle the problem of signal loss by temporarily storing the state of each photon. This allows generating new photons with the same state at each repeater, dividing the long travel distance into a number of short steps. Thierry Chanelière of CNRS in Orsay, France and his colleagues now developed a light storage method that could be the base for quantum repeaters. The technique involves reversible mapping of a light field onto a thulium-doped crystal using an atomic frequency comb (AFC). Thulium has a better frequency match with laser diodes than other rareearth ions, allowing for a better preparation of AFCs, which in turn is a key condition for high-efficiency light storage, i.e, quantum field storage.
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