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How do we reconcile between these kinds of news and that Quantum Physicist who says that Quantum computers never will amount to anything? I'm confused ...

• e63f67dd-065b 4y ago
  The claim that quantum computers will never amount to anything is more nuanced than that. There is multiple parts to that claim: - Shor's algorithm is about the only productive thing we've figured out where a quantum computer has an advantage - IBM unveils 433 qbit computer, to factor 4096 RSA we're gonna need 8192 logical qbits - Those 433 qbits are physical qbits, and there's (to the best of my knowledge) no literature on their measurement fidelity, coherence timelines, etc. These are purely experimental machines, it's not like you can plug your laptop into their giant cryogenic machines and run quantum algorithms without a giant team of literal quantum physicists standing by the thing and monitoring it - How those 433 qbits actually translate into any amount of meaningful computation is up in the air - The best we figured out was 5 logical qbits running a specialised Shor's algorithm on the 127qbit computer they unveiled a few years back to factor 21=3*7 - Nobody has, to the best of my knowledge, actually run the full Shor's algorithm on anything of note, even on these systems Not a quantum physicist; I only have vague memories from a quantum computing seminar I took long ago. Feel free to correct if any of the above is incorrect.