My understanding is that quantum computing has been taken into account for some modern cryptography. And that memory-hard cryptography basically defeats quantum computing solutions. There are a few methods, but one of them is just very long keys, it’s trivial to make a cryptographic key longer.
So sure, you could defeat some of that with a machine operating with 1024 entangled qbits, (which is… oh man… not an easy task), in which case, wow, congratulations. But what if I increase my key length to 100k? It might take an extra 3 seconds to check the key and log in, but it’ll take an extra 25 years for quantum computing to catch up.
I’d argue we need to advance spaceflight technology at as fast a pace as possible. Yes it does add CO2 to the atmosphere, but we’ve also gained some great advances through our exploration of space.
We’re doing a lot of things wrong on this planet, a whole fucking lot. But rocketry is one of the few things we’re starting to do right and the bottom line is this, the situation on earth is not great, and it could get worse. Ultimately, the situation on earth will get a lot worse when a huge, life ending, continent obliterating asteroid hits the planet (and not if it hits earth, but when it hits earth). We should absolutely continue living on earth and striving to make it a good place to live, but we also, desperately need to get a foothold off of earth. When the next global calamity occurs (and it will), I would prefer if it didn’t end all known intelligent life in the galaxy.