Spin squeezing and pairwise entanglement under non-Markovian environments with dynamical decoupling pulses

Abstract

We study the effect of non-Markovian environments on spin squeezing and pairwise entanglement of a qubit ensemble in the presence of dynamical decoupling pulses. Each qubit of the ensemble interacts with its own environment, and the environments are independent and identical. It is shown that spin squeezing and entanglement may display sudden death, asymptotic vanishing and revival behaviors. Moreover, it is indicated that spin squeezing and entanglement can be protected effectively by employing appropriate pulse separate time and pulse number as well as non-Markovian properties.