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Once I saw that the rebuttal is "quantum communications" I just laughed.

Yes. Quantum encryption requires a fiber hard-line with polarized photons. You can't hand-wave that into a wireless network.

I suspect it's about connection to BTS or at least core network which already is often fiber.

Not out of realm of possibility but would take a long time to fully develop and deploy.

Based on the article's conclusion, I thought it was part of a funding campaign by the US R&D complex:

One solution might be to cut $60 billion or so out of the US intelligence budget and divert it to a crash R&D program to bring America up to speed in quantum communications and fifth-generation broadband, technologies in which China presently has the lead.

Haven't even read it yet and thought the same based on the title alone.