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In telecom networks connected by fiber optic cable, transmitted photons tend to be absorbed by the material that comprises the cable after traveling just a few kilometers. To prevent the signal from deteriorating, repeaters are placed at regular intervals of the cable to amplify the signal.
Efforts to transmit photons over a quantum internet will face a similar challenge. Professor Tomoyuki Horikiri and colleagues at Yokohama National University are tackling this issue by developing a new source of entangled photons.
While entangled photons could be used to transfer information, long-distance quantum communication could suffer from optical fiber losses, with entangled photons becoming disentangled due to interaction with their…READ MORE