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The Resonant Exchange Qubit

Published

Author(s)

Jacob M. Taylor, Medford Jim, Johannes Beil, Emmanuel Rashba, H Lu, A. C. Gossard, C. M. Marcus

Abstract

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 π/2-gate time of 2.5 ns and a coherence time of 19 μs, using multi-pulse echo, are also demonstrated. Model calculations that include effects of hyperfine noise are in excellent quantitative agreement with experiment.
Citation
Physical Review Letters

Keywords

Quantum dots, quantum computing

Citation

Taylor, J. , Jim, M. , Beil, J. , Rashba, E. , Lu, H. , Gossard, A. and Marcus, C. (2013), The Resonant Exchange Qubit, Physical Review Letters, [online], https://doi.org/10.1103/PhysRevLett.111.050501 (Accessed October 31, 2024)

Issues

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Created July 31, 2013, Updated November 10, 2018