3 ms·
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
by AlanYx 2y ago
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?
- crdrost 2y agoSo it can be as low as 3 if you're only concerned with some of the noise, but if you're trying to correct both for bit flips (0 exchanged for 1 and vice versa) and phase drift (0 + 1 being exchanged for 0 – 1 and vice versa) then you need at least 5 physical qubits to create one logical qubit, see [wiki] for details. [wiki]: https://en.wikipedia.org/wiki/Five-qubit_error_correcting_code https://en.wikipedia.org/wiki/Five-qubit_error_correcting_co...
- Strilanc 2y agoThe threshold is where you transition from needing infinite qubits to make an error corrected logical qubit, to needing a mere finite number. So... somewhere between 1 and infinity (exclusive). 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 https://www.nature.com/articles/s41567-024-02614-w/figures/4