Physics – Quantum Physics
Scientific paper
2010-12-31
Physics
Quantum Physics
updated references
Scientific paper
Dynamical decoupling (DD) is a promising tool for preserving the quantum states of qubits. However, small imperfections in the control pulses can seriously affect the fidelity of decoupling, and qualitatively change the evolution of the controlled system at long times. Using both analytical and numerical tools, we theoretically investigate the effect of the pulse errors accumulation for two aperiodic DD sequences, the Uhrig's DD UDD) protocol [G. S. Uhrig, Phys. Rev. Lett. {\bf 98}, 100504 (2007)], and the Quadratic DD (QDD) protocol [J. R. West, B. H. Fong and D. A. Lidar, Phys. Rev. Lett {\bf 104}, 130501 (2010)]. We consider the implementation of these sequences using the electron spins of phosphorus donors in silicon, where DD sequences are applied to suppress dephasing of the donor spins. The dependence of the decoupling fidelity on different initial states of the spins is the focus of our study. We investigate in detail the initial drop in the DD fidelity, and its long-term saturation. We also demonstrate that by applying the control pulses along different directions, the performance of QDD protocols can be noticeably improved, and explain the reason of such an improvement. Our results can be useful for future implementations of the aperiodic decoupling protocols, and for better understanding of the impact of errors on quantum control of spins.
Dobrovitski Viatcheslav V.
Wang Zhi-Hui
No associations
LandOfFree
Aperiodic dynamical decoupling sequences in presence of pulse errors does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Aperiodic dynamical decoupling sequences in presence of pulse errors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aperiodic dynamical decoupling sequences in presence of pulse errors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-296456