This comment reminded me of the TV show I've been recently watching on Netflix, Pantheon. It's about a different technical breakthrough (I don't want to put any spoilers), but it's also something that completely alters society, no security is able to deal with that new technology, first thing that happens is that the technology is weaponized... etc.

Idk enough about quantum computing to even understand this... but a technology that turns, say, AES or Blowfish, suddenly trivial to crack would very likely change the world