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The linked paper touches on quantum error correction but doesn't explain what the state of the art is. Has any team successfully demonstrated a single usable lo
by AlanYx 2y ago
The linked paper touches on quantum error correction but doesn't explain what the state of the art is. Has any team successfully demonstrated a single usable logical error-corrected qubit yet? I saw this article two months ago https://physicsworld.com/a/why-error-correction-is-quantum-computings-defining-challenge/ https://physicsworld.com/a/why-error-correction-is-quantum-c... discussing the topic, but the writing makes it unclear exactly what was achieved by the various groups. Is recovery from a finite number of errors sufficient to make a usable logical cubit, or is more work still left to be done?
- sebzim4500 2y agoI think this is the SOTA https://s7d9.scene7.com/is/content/quantum/LQ_ErrorCorrectionpdf https://s7d9.scene7.com/is/content/quantum/LQ_ErrorCorrectio... the corrections significantly decrease the error rate but they need to do a lot of preselection, so it isn't quite useful yet.
- AlanYx 2y agoThanks! If I'm reading that correctly, their best error rate with pre and post selection is 0.03%, but they end the paper with the statement "A significant milestone will be to demonstrate a universal family of quantum circuits with logical error rates approaching 10^−8." Seems like we're still six orders of magnitude off.
- sebzim4500 2y agoIIRC We're just over 1 order of magnitude on the physical qbit error before we should see the exponential gains from error correction that theory predicts.