🔄FROM THE ARCHIVE Two separate teams used fiber optics networks to transmit small units of information across cities via quantum entanglement.
promises to offer important advancements for communications and encryption technologies. Both experiments encode a message into a photon and send it to a way station of sorts.
The two experiments weren't able to transmit very much information — the Calgary experiment was the quickest, and they only managed 17 photons a minute. The Hefei experiment was able to guess the state of the photons with better accuracy, however. While the Calgary researchers succeeded about 25 percent of the time, the Hefei researchers were right at most 50 percent of the time, due to their inclusion of an extra, albeit time-consuming, step in the process.
One of the largest hurdles for both teams to overcome was the tendency of fiber optic cables to stretch and compress due to temperature changes. While this doesn't matter for regular telecommunications, for quantum communication, the photons that are sent must arrive at precisely the same time. Both teams of researchers used additional complex data inputs to ensure that their photons were arriving exactly the same as they started out.
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