if you really have quantum power you can over come 120 in blink of eye
I don't know why people keep assuming that quantum computers will be able to overcome 120 bits instantly - notwithstanding they don't exist yet - but let's be real here. A GPU can tackle about 40 bits very quickly. That's the cube root of the search space of #120. Hardware improvements can only do so much to improve the speed and I wouldn't be surprised if 60 or even 70 bits at an instant will be possible on QCs. But 120 bits is a bit of a stretch at this point especially without any algorithms specifically for QC (Shor will not work against ECDSA).
I'm not saying that quantum computers won't be able to crack #120, I'm just saying it won't be instant.
lets talk about it
" Google announced it has a quantum computer that is 100 million times faster than any classical computer in its lab. "
https://bernardmarr.com/15-things-everyone-should-know-about-quantum-computing/
so assume world super computer can do max 20 Qubits calculations but google created with 50 Qubits , which is almost 3 time faster than any super computer on earth and what about D-Wave?
do you know D-wave offering quantum solution with 5000+ Qubits. only thing matter now is how to keep them cool and how to effectively get speed benefits , of course there will be time required to bring them
in full form with correct programming but dont forget first IBM pc was just doing some flops 7 calculations / running on shit OS and now where we are and doing CPU or GPU calculations in tera flops.
i told you before and will repeat it again its just matter of time 256bit algo will be piece of shit in front of quantum
trust me. its not looks simple but i have believe that optimization and improvements will bring this all in coming 50 years. time to say good bye BITCOIN.BTC