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Guided tour · Error correction · step 7 of 11

Above threshold, more qubits make it worse

Error correction is not a dial you turn up. Below the threshold it works and above it actively harms.

Now go and look

Compare decoder results measured at different physical error rates, and note which side of ~1% each sits on.

Open the example

What you should see

Results from above the threshold do not extend the curve from below it. They are a different regime, where adding code distance increases the logical error rate.