title: Universal phase shift and nonexponential decay of driven single-spin oscillations.
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.
authors.affiliation: Kavli Institute of NanoScience Delft, P.O. Box 5046, 2600 GA Delft, The Netherlands.
authors.forename: F H L
authors.initials: FH
authors.lastname: Koppens
authors.forename: D
authors.initials: D
authors.lastname: Klauser
authors.forename: W A
authors.initials: WA
authors.lastname: Coish
authors.forename: K C
authors.initials: KC
authors.lastname: Nowack
authors.forename: L P
authors.initials: LP
authors.lastname: Kouwenhoven
authors.forename: D
authors.initials: D
authors.lastname: Loss
authors.forename: L M K
authors.initials: LM
authors.lastname: Vandersypen