Fig. 3: Prediction of transmon loss. | Nature Communications

Fig. 3: Prediction of transmon loss.

From: Surpassing millisecond coherence in on chip superconducting quantum memories by optimizing materials and circuit design

Fig. 3: Prediction of transmon loss.

a 3D transmon qubit design, from which the participation ratios were calculated. Inset: SEM of Josephson junction and near-junction region on a tantalum-based transmon. Ta leads to connect to the Al junction through an overlapping Ta/Al contact region. b Predicted loss and expected T1 for transmons made using different materials and processes (Al vs. Ta capacitor pads). The loss budget is also computed, showing the dominant sources of loss in Al- and Ta-based transmons.

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