Our paper titled “High-πΈπ½/πΈπΆ transmon qudits with up to 12 levels” is now published in Phys. Rev. Applied.
https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.23.034046
We engineer a circuit with a very deep potential well to observe up to 12 levels in a single transmon and demonstrate single-shot readout and high-fidelity control of the lowest ten levels. The work was highlighted in a recent
article.