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

  • Chesi S Beijing Computational Science Research Center, Beijing 100084, China.
  • Yang LP Beijing Computational Science Research Center, Beijing 100084, China.
  • Loss D Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.
  • 2016-02-27
Published in:
  • Physical review letters. - 2016
English 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.
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https://sonar.ch/global/documents/232398
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