# filter_function¶

Classes

 Drift A static Hamiltonian term for the coherent simulation calculation as a constant Hermitian operator $$D_{l}$$. Drive A complex control term for the filter function calculation of the form $$\gamma_{j}(t) C_{j} + \mathrm{H.c.}$$, where $$C_{j}$$ is a non-Hermitian operator and $$\gamma_{j}(t)$$ is a complex-valued piecewise-constant function between 0 and $$\tau$$. Result The filter function $$F(f)$$ sampled at the frequencies $$\{f_j\}$$ that you requested, its precision, and the Fourier transformed noise operator $$\mathcal{F} \left\{ \tilde N^\prime(t) \right\}(f)$$. ResultScope Configuration for the scope of the returned data. Sample The value of the filter function for a single frequency. Shift A real control term for the filter function calculation of the form $$\alpha_{k}(t) A_{k}$$, where $$A_{k}$$ is a Hermitian operator and $$\alpha_{k}(t)$$ is a real-valued piecewise-constant function between 0 and $$\tau$$.