This. Anyone interested in quantum computing owes it to themselves to watch this Caltech conference keynote:

Quantum Computing: Reality vs. Hype - John Preskill

Exec summary: For QC to “break RSA”, we need 7-8 orders of magnitude more physical qbits than we had in 2019.

Error correction cleverness and better controls have knocked down 3-4 of those. Which is impressive. Now just 1,000x - 100,000x more improvement needed. When you hear a QC advance, remember the questions are

  • how many logical qbits? (error correction is a bitch)

  • how long to get data into/out of the QC? (actually a major issue)