Maybe I am old fashioned, but when I think encryption, I think math. Quantum encryption systems instead seem to rely on quantum mechanical effects rather than any form of computation, per se. I find them somewhat concerning, especially when a confirm security expert admits he doesn’t understand enough physics to assess a system’s security accurately.
Sure, any evolution or revolution in technology is going to invalidate some prior expertise. But the standards should be preserved. Whether mathematicians or physicists are working on information security, provable security should be a goal.