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In this paper, we first design a type of Bang-Bang (BB) operation group toreduce the phase decoherence in a {\Xi}-type n-level quantum system based onthe dynamical decoupling mechanism. Then, we derive two kinds of dynamicaldecoupling schemes: periodic dynamical decoupling (PDD) and Uhrig dynamicaldecoupling (UDD). We select the non-diagonal element of density matrix as areference index, and investigate the behavior of quantum coherence of the{\Xi}-type n-level atom under these two dynamical decoupling schemes proposed.At last, we choose a {\Xi}-type six-level atom as a system controlled, and usethe decoupling schemes proposed to suppress the phase decoherence. Thesimulation experiments and the comparison results are given.

Optimized Dynamical Decoupling in {\Xi}-Type n-Level Quantum Systems