Qubit Zoo

Coulomb blockade spectroscopy as a probe of topological Majorana zero modes

1 min read

Coulomb blockade spectroscopy in semiconductor-superconductor hybrid islands provides a key diagnostic for topological Majorana zero modes. By measuring 2e-periodic to 1e-periodic transitions in Coulomb oscillations as a function of magnetic field, this technique probes subgap state parity and near-zero-energy modes in InAs-Al nanowire devices. The method is central to the “topological gap protocol” developed by Microsoft’s topological qubit program.

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