Publication: Quantum-Dot-Based Resonant Exchange Qubit
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Date
2013
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American Physical Society (APS)
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Medford, J., J. Beil, J. M. Taylor, E. I. Rashba, H. Lu, A. C. Gossard, and C. M. Marcus. 2013. “Quantum-Dot-Based Resonant Exchange Qubit.” Physical Review Letters 111 (5) (July). doi:10.1103/physrevlett.111.050501.
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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 multipulse echo, are also demonstrated. Model calculations that include effects of hyperfine noise are in excellent quantitative agreement with experiment.
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