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The Resonant Exchange Qubit

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arxiv 1304.3413 v2 pith:2RGCJBGG submitted 2013-04-11 cond-mat.mes-hall quant-ph

J. Medford , J. Beil , J. M. Taylor , E. I. Rashba , H. Lu , A. C. Gossard , C. M. Marcus This is my paper
classification cond-mat.mes-hallquant-ph
keywords exchangequbitcontrolfieldhyperfinetimeagreementallowing
verification ladder T0 review T1 audit T2 compute T3 formal
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We introduce a solid-state qubit in which exchange interactions among confined electrons provide both the static longitudinal field and the oscillatory transverse field, allowing rapid and full qubit control via rf gate-voltage pulses. We demonstrate two-axis control at a detuning sweet-spot, where leakage due to hyperfine coupling is suppressed by the large exchange gap. A {\pi}/2-gate time of 2.5 ns and a coherence time of 19 {\mu}s, using multi-pulse echo, are also demonstrated. Model calculations that include effects of hyperfine noise are in excellent quantitative agreement with experiment.

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