Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-03-17
J. Mod. Opt. 54, 2629 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 3 figures. Invited talk at the XXXVII Winter Colloquium on the Physics of Quantum Electronics, Snowbird, Jan 2007. Su
Scientific paper
The dominant source of decoherence for an electron spin in a quantum dot is the hyperfine interaction with the surrounding bath of nuclear spins. The decoherence process may be slowed down by subjecting the electron spin to suitable sequences of external control pulses. We investigate the performance of a variety of dynamical decoupling protocols using exact numerical simulation. Emphasis is given to realistic pulse delays and the long-time limit, beyond the domain where available analytical approaches are guaranteed to work. Our results show that both deterministic and randomized protocols are capable to significantly prolong the electron coherence time, even when using control pulse separations substantially larger than what expected from the {\em upper cutoff} frequency of the coupling spectrum between the electron and the nuclear spins. In a realistic parameter range, the {\em total width} of such a coupling spectrum appears to be the physically relevant frequency scale affecting the overall quality of the decoupling.
Dobrovitski Viatcheslav V.
Harmon Bruce N.
Santos Lea F.
Viola Lorenza
Zhang Wenxian
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