Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.050501
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Funding
- Office of the Director of National Intelligence, Intelligence Advanced Research Projects Activity (IARPA), through the Army Research Office Grant [W911NF-12-1-0354]
- National Science Foundation Materials World Network Program
- Villum Foundation
- Danish National Research Foundation
- NSF Physics Frontier Center at the JQI
- Harvard University
- DARPA MTO
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0908070] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [822671] Funding Source: National Science Foundation
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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 multipulse echo, are also demonstrated. Model calculations that include effects of hyperfine noise are in excellent quantitative agreement with experiment.
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