Universal Fast-Flux Control of a Coherent, Low-Frequency Qubit

  title={Universal Fast-Flux Control of a Coherent, Low-Frequency Qubit},
  author={Helin Zhang and Srivatsan Chakram and Tanay Roy and Nathan Earnest and Yao Lu and Ziwen Huang and Daniel Weiss and Jens Koch and David I. Schuster},
  journal={arXiv: Quantum Physics},
The \textit{heavy-fluxonium} circuit is a promising building block for superconducting quantum processors due to its long relaxation and dephasing time at the half-flux frustration point. However, the suppressed charge matrix elements and low transition frequency have made it challenging to perform fast single-qubit gates using standard protocols. We report on new protocols for reset, fast coherent control, and readout, that allow high-quality operation of the qubit with a 14 MHz transition… 

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