期刊
PHYSICAL REVIEW B
卷 82, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.115445
关键词
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资金
- DFG [SPP 1285, FOR 912, SFB 767]
- Sloan and Packard Foundations, DARPA [N66001-09-1-2020]
- NSF [DMR-0819860, DMR-0846341]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [819860] Funding Source: National Science Foundation
We theoretically demonstrate that nuclear spins can be harnessed to coherently control two-electron spin states in a double quantum dot. Hyperfine interactions lead to an avoided crossing between the spin singlet state and the m(s)=+1 triplet state, T(+). We show that a coherent superposition of singlet and triplet states can be achieved using finite-time Landau-Zener-Stuckelberg interferometry. In this system the coherent rotation rate is set by the Zeeman energy, resulting in similar to 1 ns single spin rotations. We analyze the coherence of this spin qubit by considering the coupling to the nuclear spin bath and show that T(2)* similar to 16 ns, in good agreement with experimental data. Our analysis further demonstrates that efficient single qubit and two-qubit control can be achieved using Landau-Zener-Stuckelberg interferometry.
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