Nanowire Superinductance Fluxonium Qubit

T. M. Hazard, A. Gyenis, A. Di Paolo, A. T. Asfaw, S. A. Lyon, A. Blais, A. A. Houck

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Abstract

We characterize a fluxonium qubit consisting of a Josephson junction inductively shunted with a NbTiN nanowire superinductance. We explain the measured energy spectrum by means of a multimode theory accounting for the distributed nature of the superinductance and the effect of the circuit nonlinearity to all orders in the Josephson potential. Using multiphoton Raman spectroscopy, we address multiple fluxonium transitions, observe multilevel Autler-Townes splitting and measure an excited state lifetime of T1=20 μs. By measuring T1 at different magnetic flux values, we find a crossover in the lifetime limiting mechanism from capacitive to inductive losses.

Original languageEnglish (US)
Article number010504
JournalPhysical review letters
Volume122
Issue number1
DOIs
StatePublished - Jan 10 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Hazard, T. M., Gyenis, A., Di Paolo, A., Asfaw, A. T., Lyon, S. A., Blais, A., & Houck, A. A. (2019). Nanowire Superinductance Fluxonium Qubit. Physical review letters, 122(1), [010504]. https://doi.org/10.1103/PhysRevLett.122.010504