In a step toward an ultra-secure global communication network, scientists have transmitted a quantum-encrypted message through the air in real-world city conditions.
The breakthrough marks the first time researchers have demonstrated that more than one bit of information per photon could be sent across this type of environment, in a phenomenon known as 4D encryption.
The team demonstrated 4D quantum encryption between two buildings situated nearly one-fifth of a mile apart (.3 km) - and eventually, they say it could be used to link Earth with moving objects such as an airplane, or even satellites in space.
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The breakthrough marks the first time researchers have demonstrated that more than one bit of information per photon could be sent across this type of environment, in a phenomenon known as 4D encryption. An artist's impression is pictured