Correction of Arbitrary Errors in Population Inversion of Quantum   Systems by Universal Composite Pulses
  We introduce universal broadband composite pulse sequences for robust high-fidelity population inversion in two-state quantum systems, which compensate deviations in any experimental parameter (e.g. pulse amplitude, pulse duration, detuning from resonance, Stark shifts, unwanted frequency chirp, etc.) and are applicable with any pulse shape. We demonstrate the efficiency and universality of these composite pulses by experimental data on rephasing of atomic coherences in a $\text{Pr}^{3+}\text{:}\text{Y}_2\text{SiO}_5$ crystal. 
Genko T. Genov, Daniel Schraft, Thomas Halfmann and Nikolay V. Vitanov
quant-ph