A quantum communication experiment tucked inside a tiny satellite could someday lead to a global network for sending or receiving unbreakable codes. One of the first steps came during a weather balloon flight to test whether a quantum experiment's hardware could survive near-space conditions.
Several groups around the world are racing to launch quantum experiments aboard satellites or even the International Space Station. But Singapore's Centre for Quantum Technologies has worked hard to shrink the usual quantum lab equipment down to the size of a sandwich — the space available for science experiments aboard a cheaper "CubeSat" that can piggyback on rocket launches for bigger missions.
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