State Readout of a Trapped Ion Qubit Using a Trap-Integrated Superconducting Photon Detector.

@article{Todaro2021StateRO,
  title={State Readout of a Trapped Ion Qubit Using a Trap-Integrated Superconducting Photon Detector.},
  author={Susanna L. Todaro and Varun B. Verma and Katherine C McCormick and D. T. C. Allcock and Richard P. Mirin and David J. Wineland and Sae Woo Nam and Alex Wilson and Dietrich Leibfried and D. H. Slichter},
  journal={Physical review letters},
  year={2021},
  volume={126 1},
  pages={
          010501
        }
}
We report high-fidelity state readout of a trapped ion qubit using a trap-integrated photon detector. We determine the hyperfine qubit state of a single ^{9}Be^{+} ion held in a surface-electrode rf ion trap by counting state-dependent ion fluorescence photons with a superconducting nanowire single-photon detector fabricated into the trap structure. The average readout fidelity is 0.9991(1), with a mean readout duration of 46  μs, and is limited by the polarization impurity of the readout laser… 

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