Table 1.

Error budget for the one-layer and two-layer QEC processes. The predicted lifetime calculated from the error model agrees well with the measured lifetimes

Error source	One-layer QEC	Two-layer QEC
Intrinsic errora	6.4%	12.4%
Detection error	1.4%	2.8%
Recovery error	2.9%	3.8%
Thermal error	0.8%	1.1%
Total error	11.5%	20.1%
Predicted lifetime	757 μs	824 μs
Measured lifetime	755 ± 9 μs	805 ± 18 μs

^aThese errors are estimated from numerical simulations.