The linked article says that they've achieved "the baseline necessary to perform error correction". With the stated error rate, roughly how many physical qubits would be required to produce one error-corrected logical qubit?
Actually, because "in theory there's no difference between theory and practice but in practice there is", the number is probably still infinity. Like, if you look at figure 4 of their paper [0], you can see one device of the three is well above threshold at 1.5% error. They need sufficient quality more consistently before a large system built out of the pieces they are benchmarking would be below threshold.
[1]: https://www.nature.com/articles/s41567-024-02614-w/figures/4
[wiki]: https://en.wikipedia.org/wiki/Five-qubit_error_correcting_co...