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

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-...

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Bibliographic Details
Published in:Physical review letters 2021-01, Vol.126 (1), p.010501-010501, Article 010501
Main Authors: Todaro, S L, Verma, V B, McCormick, K C, Allcock, D T C, Mirin, R P, Wineland, D J, Nam, S W, Wilson, A C, Leibfried, D, Slichter, D H
Format: Article
Language:English
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Summary: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 beam and by off-resonant optical pumping. Because there are no intervening optical elements between the ion and the detector, we can use the ion fluorescence as a self-calibrated photon source to determine the detector quantum efficiency and its dependence on photon incidence angle and polarization.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.126.010501