Quantum encryption is theoretically a dream for security, as you can’t even inspect the data without altering it. However, it’s currently several times slower than the conventional kind, which makes it impractical for voice calls or streaming video
Researchers have developed a quantum encryption key distribution system that promises to be five to 10 times faster than existing methods.
https://www.engadget.com/2017/11/26/scientists-develop-fast-quantum-encryption/
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