Todaro, S.
, Verma, V.
, McCormick, K.
, Allcock, D.
, Mirin, R.
, Wineland, D.
, Nam, S.
, Wilson, A.
, Leibfried, D.
and Slichter, D.
(2021),
State Readout of a Trapped Ion Qubit Using a Trap-integrated Superconducting Photon Detector, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929700
(Accessed October 3, 2025)
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State Readout of a Trapped Ion Qubit Using a Trap-integrated Superconducting Photon Detector
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Abstract
We detect fluorescence photons emitted by a single $^9$Be$^+$ ion confined in a surface- electrode rf ion trap, using a superconducting nanowire single photon detector integrated directly into the trap. We achieve a qubit readout fidelity of 99.91(1) % with an average readout duration of 46 $\mu$s, limited by the polarization impurity of the readout laser beam and off-resonant optical pumping into the fluorescing state. We use the ion fluorescence to perform an absolute calibration of the detector quantum efficiency and characterize its dependence on incidence angle and polarization.Citation
Physical Review Letters
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Journals
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Keywords
Superconducting photon detector, single photon detector, ion trap, quantum measurement, quantum computing
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Created January 6, 2021, Updated April 23, 2021