  In this work we present an algorithm of building an adequate model of
polarizing quantum state measurement. This model takes into account chromatic
aberration of the basis change transformation caused by the parasitic
dispersion of the wave plates crystal and finite radiation spectral bandwidth.
We show that the chromatic aberration reduces the amount of information in the
measurements results. Using the information matrix approach we estimate the
impact of this effect on the qubit state reconstruction fidelity for different
values of sample size and spectral bandwidth. We also demonstrate that our
model outperforms the standard model of projective measurements as it could
suppress systematic errors of quantum tomography even when one performs the
measurements using wave plates of high order.
