IBM to build first large-scale, error-corrected quantum computer by 2028

technologyreview.com

13 pointsbaruchel3 comments

200 logical qubuts

> IBM’s error correction algorithm, known as a low-density parity check code, will make it possible to use 12 physical qubits per logical qubit

They have a machine with over 1000 PHYSICAL qubits today. I'm guessing this 12 physical per one logical is some sort of theoretical possibility, not something that can actually be realized.

Then you probably need a few thousand LOGICAL qubits to do anything meaningful with a QC.

There is no evidence that any of this will scale.

Every news release seems optimized for generating hype that will produce a round of funding that will enable the next news release.

> There is no evidence that any of this will scale.

Like predicting the singularity, it's about trends not where we are today. Any exponential curve looks flat until you scale it for the critical level which does the hockey-stick thing. I've read that we needed 1000s of physical qubits per logical. Now this is saying 100 or 12--that's progress. There was another story (Microsoft Majorana-based Topological Qubits) about improvements in decoherence/stability with scale.

Reply on news.ycombinator.com