We investigate how to protect quantum correlations for two qubits each locally interacting with its own non-Markovian environment by making use of bang-bang pulses. It is shown that the quantum discord dynamics presents the phenomenon of sudden change for some certain initial states. We also find that the amount of quantum correlation between two qubits can be improved by applying a train of pulses and protected more effectively with shorter interval pulses or longer reservoir correlation time.
© 2012 Optical Society of America
Original Manuscript: April 6, 2012
Revised Manuscript: June 6, 2012
Manuscript Accepted: June 17, 2012
Published: July 20, 2012
Hang-Shi Xu and Jing-bo Xu, "Protecting quantum correlations of two qubits in independent non-Markovian environments by bang-bang pulses," J. Opt. Soc. Am. B 29, 2074-2079 (2012)