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Scalable simultaneous multiqubit readout with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>99</mml:mn><mml:mo>.</mml:mo><mml:mn>99</mml:mn><mml:mi>%</mml:mi></mml:mrow></mml:math>single-shot fidelity
We describe single-shot readout of a trapped-ion multi-qubit register using space and time-resolved camera detection. For a single qubit we measure 0.9(3)x10^{-4} readout error in 400us exposure time, limited by the qubit's decay lifetime. For a four-qubit register (a "qunybble") we measure an additional error of only 0.1(1)x10^{-4} per qubit, …