Decoupling sequences Dynamical decoupling(DD) Pulse sequence Reference method CPMG(PDD) 7(2j-1)/2N even l:p1→>P Concatenated dd(cdd) PRL95,180501(2005) odd l P1-1→>丌→>P-1 Optimal DD(UDD) TSin2(jiz/2N+2)PR98100504(2007 PRL101,180403(2008) Optimization of UDD locally optimized DD(LODD) sequence for given Nature458,996(2009) noise PRL103,040501(2009)Dynamical decoupling(DD) method Pulse sequence Reference CPMG(PDD) Concatenated DD(CDD) PRL 95, 180501 (2005) Optimal DD(UDD) PRL 98, 100504 (2007) PRL 101, 180403 (2008) locally optimized DD (LODD) Optimization of UDD sequence for given noise Nature 458, 996 (2009) PRL 103, 040501 (2009) …… 1 1 1 1 : : l l l l even l p p odd l p p  − − − − → → → ( ) 2 TSin j N  / 2 2 + Decoupling sequences T j N (2 1) / 2 −