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Single-qubit-gate error below 10^-4 in a trapped ion

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arxiv 1104.2552 v2 pith:WLN3K5JH submitted 2011-04-13 quant-ph

K. R. Brown , A. C. Wilson , Y. Colombe , C. Ospelkaus , A. M. Meier , E. Knill , D. Leibfried , D. J. Wineland This is my paper
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keywords belowerrorquantumsingle-qubit-gatetraptrappedaboveachievement
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With a 9Be+ trapped-ion hyperfine-states qubit, we demonstrate an error probability per randomized single-qubit gate of 2.0(2) x 10^-5, below the threshold estimate of 10^-4 commonly considered sufficient for fault-tolerant quantum computing. The 9Be+ ion is trapped above a microfabricated surface-electrode ion trap and is manipulated with microwaves applied to a trap electrode. The achievement of low single-qubit-gate errors is an essential step toward the construction of a scalable quantum computer.

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