Table 3.
Two qubit characterization
| Gate | CX length (ns) | EPG (%) | EPG_simul (%) |
|---|---|---|---|
| 11_14 | 483.6 | 0.53 | 0.95 |
| 12_15 | 433.8 | 0.78 | 1.42 |
| 12_10 | 334.2 | 0.42 | 1.02 |
| 12_13 | 519.1 | 0.61 | 1.03 |
| 14_13 | 504.9 | 0.77 | 1.49 |
| 15_18 | 469.3 | 0.49 | 1.10 |
| 16_14 | 440.9 | 0.50 | 0.82 |
| 16_19 | 696.9 | 2.09 | 1.14 |
| 18_17 | 426.7 | 4.03 | 3.96 |
| 18_21 | 348.4 | 0.56 | 0.73 |
| 2_1 | 362.7 | 0.34 | 0.55 |
| 21_23 | 519.1 | 0.65 | 0.67 |
| 22_19 | 362.7 | 0.50 | 0.94 |
| 22_25 | 412.4 | 0.47 | 0.57 |
| 24_23 | 384.0 | 0.64 | 0.81 |
| 24_25 | 384.0 | 0.69 | 0.91 |
| 3_2 | 426.7 | 0.52 | 0.53 |
| 3_5 | 391.1 | 0.40 | 0.64 |
| 4_1 | 547.6 | 0.46 | 0.49 |
| 5_8 | 348.4 | 0.47 | 0.71 |
| 7_10 | 362.7 | 1.42 | 0.76 |
| 7_4 | 426.7 | 0.39 | 0.54 |
| 8_11 | 526.2 | 1.16 | 1.39 |
| 9_8 | 384.0 | 0.58 | 0.84 |
| Mean | 437.3 | 0.81 | 1.00 |
| Std. | 82.5 | 0.77 | 0.68 |
The two qubit CX gates are constructed from the echoed cross-resonance gate46, with lengths and gate directions optimized for overall device performance. EPG is measured with spectator qubits idling while simultaneous EPG is taken with spectator qubits undergoing single qubit RB. Mean and standard deviation are across all CX gates listed.