New all-fiber device simplifies free-space based quantum key distribution

Rather than relying on math, quantum key distribution uses quantum properties of light such as polarization to encode and send a random key needed to decrypt encoded data. "Our scheme simplifies quantum key distribution for free-space communication -- such as from satellites to Earth or between moving terminals-- which is required to achieve a global quantum network." Developing a global network Because quantum encryption doesn't work well over long-distance fiber networks there is now a push to develop a satellite-based quantum communication network to link various ground-based quantum encryption networks around the world. 

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