The Resonant Exchange Qubit

TitleThe Resonant Exchange Qubit
Publication TypeJournal Article
Year of Publication2013
AuthorsMedford, J, Beil, J, Taylor, JM, Rashba, EI, Lu, H, Gossard, AC, Marcus, CM
JournalPhysical Review Letters
Date Published2013/7/31

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.

Short TitlePhys. Rev. Lett.