[ExI] Quantum Key Distribution for Cryptography

[John Clark]

Chinese researchers report in the journal Nature that they have used
quantum entanglement and a satellite to send a Cryptographic key over a
record distance of 1120 Kilometers as securely as the laws of physics allow
and do so with unprecedented speed and low error rates. The transmission
speed was about one bit every eight seconds, that may sound slow but it's
several orders of magnitude faster than anything done before, and you'd
only be using it to send the cryptographic key, not an entire message. If
quantum computers become practical it may be the only form of cryptography
that still works. US researchers say it would take at least three years to
equal what the Chinese have done.

Entanglement-based secure quantum cryptography over 1,120 kilometres
<https://www.nature.com/articles/s41586-020-2401-y>

John K Clark
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