Decoding Qubit Decoherence: The Role of Material Defects
![Computed tunnel splitting for oxygen-hydrogen and oxygen-deuterium defects exhibits an exponential dependence on the mass-scaled phonon coordinate $Q^{\prime}=Q\sqrt{m/m\_{\mathrm{Nb}}}$, as demonstrated using a four-dimensional Hamiltonian, with distinct behaviors observed for vibrational masses corresponding to vanadium (circles), niobium (squares), and tantalum (triangles), aligning with existing experimental data from reference [29].](https://arxiv.org/html/2512.18156v1/x3.png)
A new theoretical framework details how lattice distortions and anharmonic couplings within superconducting qubit materials drive decoherence, offering insights for improved qubit design.
Science
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