Radio frequency methods for Majorana based quantum computing: fast charge sensing and phase diagram mapping*

We employ radio frequency techniques to demonstrate two measurements: first, by embedding an InAs/Al nanowire directly into a resonant circuit, it is possible to map key features of the conductance vs. gate-voltage phase diagram approximately 40 times faster than conventional lock-in methods; second, by capacitively coupling the same nanowire to a radio-frequency single electron transistor, fabricated from another nanowire, we demonstrate detection of single electron inter-island transitions, with signal-to-noise ratios exceeding 5 for an integration time below 1 μs at axial (parallel to nanowire) magnetic fields of 0.6T. Latter results will be the requirements for implementing Majorana based quantum computation in hybrid superconductor-semiconductor nanowire devices, and demonstrates the full compatibility of the high-bandwidth sensing techniques. Presented device geometries are similar to that have previously shown signatures of Majorana-like bound states.