期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.010501
关键词
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资金
- NIST Quantum Information Program
- IARPA
In this experiment, high-fidelity state readout of a trapped ion qubit was reported using a trap-integrated photon detector. The average readout fidelity is 0.9991(1), with a mean readout duration of 46 mu s. The readout fidelity is limited by the polarization impurity of the readout laser beam and by off-resonant optical pumping.
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 Be-9(+) 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 mu s, 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.
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