Experimental realization of robust dynamical decoupling with bounded   controls in a solid-state spin system
  We experimentally demonstrate a robust dynamical decoupling protocol with bounded controls using long soft pulses, eliminating a challenging requirement of strong control pulses in conventional implementations. This protocol is accomplished by designing the decoupling propagators to go through a Eulerian cycle of the coupler group [Phys. Rev. Lett. 90, 037901(2003)]. We demonstrate that this Eulerian decoupling scheme increases the coherence time by two orders of magnitude in our experiment under either dephasing or a universal noise environment. 
F. Wang, C. Zu, L. He, W.-B. Wang, W.-G. Zhang, L.-M. Duan
quant-ph