this post was submitted on 16 Apr 2024
326 points (98.8% liked)
Technology
59534 readers
3195 users here now
This is a most excellent place for technology news and articles.
Our Rules
- Follow the lemmy.world rules.
- Only tech related content.
- Be excellent to each another!
- Mod approved content bots can post up to 10 articles per day.
- Threads asking for personal tech support may be deleted.
- Politics threads may be removed.
- No memes allowed as posts, OK to post as comments.
- Only approved bots from the list below, to ask if your bot can be added please contact us.
- Check for duplicates before posting, duplicates may be removed
Approved Bots
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
And then there's some people (me included) who bet a whole beer on quantum computers being inherently impossible. Not the "get them to calculate" part, but the "shave a factor off the asymptotics of computers using ordinary physics" part. The argument is simple: It could very well be that the more data you try to squeeze into a qbit, the fuzzier the result is going to get, so if you put ten million numbers each into two qbits and somehow make the qbits add them, you'll get ten million results that are ten million times fuzzier than if you'd put in a single number. To the best of my knowledge I've not yet lost that bet, it has not been demonstrated that researchers won't run against a wall, there, essentially that the universe has a limited computation capacity per volume of space (or however you measure things at that scale).
Other fun thing to annoy people with: Claim that deciding between P = NP and P /= NP is undecidable.
I think in general the goal is not to stuff more information into fewer qubits, but to stabilize more qubits so you can hold more information. The problem is in the physics of stabilizing that many qubits for long enough to run a meaningful calculation.
Argh it's been a while. The question is whether an n-qbit system actually can contain arbitrary (k <= 2^n^) amounts of n-bit states for arbitrary values of n and k: Such a system might work up to a certain number, but then lose coherence once you try to exceed what the universe can actually compute. As far as I know we simply don't know because noone has yet built a system that actually pushes boundaries in earnest. The limiting factor is more n than k I think but then I'm not a quantum physicist.
It would still mean ludicrously miniaturised computing, in fact, minimised to a maximum extent, but it would not give the asymptotic speedup cryptologists are having nightmares about.