Spin Environment of a Superconducting Qubit in High Magnetic Fields

Granular Aluminium nanojunction (gralmonium) superconducting qubit on large magnetic field

Not high coherence, $T_1\approx 8\mu \text{s}$ and $T_2^{\text{Echo}}\approx 3\mu \text{s}$, but beyond 1T magnetic field.

Happy to see Pop’s group continues to push the state-of-the-art of GrAl

I remember one of the first questions I had at the beginning of my PhD is why we didn’t use nanojunctions more in superconducting qubits, and why all the major implementations were SIS Josephson Junctions. It is good to see that other JJ models are being used.

Reference: arXiv:2501.03661