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