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IBM releases first-ever 1,000-qubit quantum chip
(www.nature.com)
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this post was submitted on 04 Dec 2023
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But you have control of the network with a majority of mining right? So it's very possible that one or more organisations could control it for long enough that it's not trusted?
And how does proof of stake work cryptography?
I’m not really a great source for this stuff but I would assume that the quantum computer would have to be more powerful than all of the other mining compute combined for that to happen. Then it would have to be so far ahead that no new quantum computers were coming online to compete against it.
The other part is incentive. If you want to take over 50% of the network the incentive wouldn’t be to double spend because once it’s detected the price collapses due to lack of trust, bitcoins fundamentals change and it’s no longer decentralised effectively making it another centralised shitcoin. There could be incentive for a government to do this or a rival currency but bitcoin is fundamental to all crypto currencies so they would be damaging themselves greatly in the process.
I can’t answer your proof of stake question with any confidence