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BB84 is like the first flight at kittyhawk. QM has been around (theoretically) since the big E - 1930's; BB84 was the first use of QM for a practical application. That was in 1984 (it is not cheap or easy, but if you don't think it is being used today by those that really need and can afford to do it- ie. Uncle S, think again)
Advances in QM are not coming quickly, but it will be worth the wait. If you want a steady job in the future, start studying QM. It isn't that difficult, it is just extremely "unfamiliar." The math of E's theory of relativity (differential geometry) is much more difficult than the math of QM.
Shut up and calculate!
Charles
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"Igneous Aquam et Laudi semper"
Carl Muckley
Last edited by charlesbahn; 10-25-2019 at 07:23 PM..
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