Universal phase shift and nonexponential decay of driven single-spin oscillations |
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Authors: | Koppens F H L Klauser D Coish W A Nowack K C Kouwenhoven L P Loss D Vandersypen L M K |
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Institution: | Kavli Institute of NanoScience Delft, P.O. Box 5046, 2600 GA Delft, The Netherlands. |
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Abstract: | We study, both theoretically and experimentally, driven Rabi oscillations of a single electron spin coupled to a nuclear-spin bath. Because of the long correlation time of the bath, two unusual features are observed in the oscillations. The decay follows a power law, and the oscillations are shifted in phase by a universal value of approximately pi/4. These properties are well understood from a theoretical expression that we derive here in the static limit for the nuclear bath. This improved understanding of the coupled electron-nuclear system is important for future experiments using the electron spin as a qubit. |
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