Dephasing due to Nuclear Spins in Large-Amplitude Electric Dipole Spin Resonance

We analyze effects of the hyperfine interaction on electric dipole spin resonance when the amplitude of the quantum-dot motion becomes comparable or larger than the quantum dot's size. Away from the well-known small-drive regime, the important role played by transverse nuclear fluctuations lead...

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Veröffentlicht in:Physical review letters 2016-02, Vol.116 (6), p.066806-066806, Article 066806
Hauptverfasser: Chesi, Stefano, Yang, Li-Ping, Loss, Daniel
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Sprache:eng
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Zusammenfassung:We analyze effects of the hyperfine interaction on electric dipole spin resonance when the amplitude of the quantum-dot motion becomes comparable or larger than the quantum dot's size. Away from the well-known small-drive regime, the important role played by transverse nuclear fluctuations leads to a Gaussian decay with characteristic dependence on drive strength and detuning. A characterization of spin-flip gate fidelity, in the presence of such additional drive-dependent dephasing, shows that vanishingly small errors can still be achieved at sufficiently large amplitudes. Based on our theory, we analyze recent electric dipole spin resonance experiments relying on spin-orbit interactions or the slanting field of a micromagnet. We find that such experiments are already in a regime with significant effects of transverse nuclear fluctuations and the form of decay of the Rabi oscillations can be reproduced well by our theory.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.116.066806