  We propose technique of simultaneous excitation of disordered qubits
providing an effective suppression of inhomogeneous broadening in their
spectral density. The technique is based on applying of optimally chosen
$\pi$-pulse with non-rectangular smooth shape. We study excitation dynamics of
an off-resonant qubit subjected to strong classical electromagnetic driving
field with the fast reference frequency and slow envelope. Within this solution
we optimize the envelope to achieve a preassigned accuracy in qubit
synchronization.
