This is the third topic I have seen about the new quantum computer that Google has released and I'm surprised that there is so much scare mongering among a Bitcoin forum. I'm going to reiterate what I have said in previous threads that this quantum computer is not designed to be a threat to Bitcoin in anyway and is only efficient at very specific tasks so the concerns over mining are redundant as the quantum computer that Google and IBM are developing are not designed to mine Bitcoin and would not be any significant improve over dedicated mining machines.
Quantum-resistant cryptography already exists, so banks and other centralized institutions are in a much better position to recover.
With Bitcoin, we have much bigger problems. Simply switching to quantum-resistant signatures doesn't solve the issue because we can't force people to move their bitcoins to safe addresses. Something like 1/3 of the circulating supply is at risk -- quite possibly more -- due to key reuse, xpub sharing, pay-to-pubkey mining, etc. If a QC attacked Bitcoin in the wild, it would irreparably destroy faith in the currency based on that alone. I don't believe the same is true for banks.
People would be stupid not to move if the encryption was under threat and we could actually force them by requiring them to change addresses if all wallet software developers accepted this change. It would benefit the Bitcoin community and would be the only time I would suggest a forced move to prevent further loss of coins but if people don't move and lose their coins then that would be entirely their fault for refusing something which is so blatantly obvious.