The logical qubit is getting cheaper by the year
the logical qubit is getting cheaper by the year: caltech cut the physical qubits needed for one logical qubit from over twelve, ibm proved error-correction decoding can run in real time, and hefei’s lab verified that more correction keeps converging on the right answer. 2026 is being called the year the field stopped faking it.
the qubit count is becoming less interesting than the error budget.
Context
Nature Communications published in June 2026 a demonstration of real-time, low-latency quantum error correction with superconducting qubits. Caltech and Oratomic's mitten qLDPC codes, reported Aug 3, 2026, reach a 20 percent encoding rate, with 975 physical qubits encoding 195 logical qubits.
An Aug 2026 arXiv paper covers real-time decoding of error correction codes on high-performance computing.
Real-time decoding and Caltech cutting the physical qubits per logical qubit match the sources; the mitten codes are the reported Caltech result. IBM proving real-time decoding, a Hefei lab verifying convergence with more correction, 'over twelve' as the prior qubit count, and 2026 being called the year the field stopped faking it were not seen in the sources read, so unsupported here, not refuted.
Related work
Watch next
- Check the Hefei lab's error correction result.
Sources
- Nature Communications, Jun 1, 2026nature.com
- Quantum Intel, Aug 3, 2026quantumintel.tech
- arXiv, high-rate qLDPC processors, Aug 5, 2026ar5iv.labs.arxiv.org
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 2 October 2026 at 14:07 IST. Sources are the papers and datasets the note draws on.
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