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 S. W. Nam and A. C. 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… Expand

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