Fig. 3: Error population under different conditions.
From: Autonomous error correction of a single logical qubit using two transmons
Black, blue, and green points represent tomographic measurement results under free decay, 4 QQ echo, and full AQEC. The y-axes represent the combined population of error states for initial states a\(\left\vert {L}_{0}\right\rangle\), b\(\left\vert {L}_{1}\right\rangle\), and c\(\left\vert {L}_{x}\right\rangle\). Population accumulates at the error states in the free decay case, enhanced in the 4 QQ echo case, and corrected with AQEC drive on. The experimental data is explained with master equation simulations shown in solid lines. Error bars (one standard deviation) are smaller than the marker size38. Detailed fitting parameters used for the solid lines are shown in Supplementary Note 10.
