The link is, that a quantum computer can decrypt all data encrypted in blockchain. In other words, all private keys for every wallet would be known and everyone with a quantum computer could withdraw your coins.
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Oh my! A totally different ballgame, then. This technology, which is cutting edge today, would be completely obsolete!
As always. I don't see you writing this comment on a typewriter. Totally cutting edge a little while ago :P Same with data encryption. 70 years ago the Enigma machine was groundbreaking. Today every calculator would be better.