Quantum encryption or cryptography is a specialized niche. I am not sure
how a classical system can be robust against interlopers in the way a
quantum channel is, for such would results in a disruption of the wave
function. Maybe some clever use of a quantum eraser might get around this.
I view quantum cryptography as mostly hype.
Quantum cryptography doesn't solve the problem of authentication which is
the main challenge when distributing keys (i.e., ensuring the right person
is getting them, rather than merely ensuring they weren't intercepted).
The other reason I think it is
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
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