# Drift¶

class qctrl.dynamic.types.filter_function.Drift(*, operator, noise=False)

A static Hamiltonian term for the coherent simulation calculation as a constant Hermitian operator $$D_{l}$$.

Variables:
• operator (ndarray) – The Hermitian matrix $$D_{l}$$ that represents the term.

• noise (bool, optional) – Whether you want the noise operator to correspond to this term. If True, the noise operator is $$D_l$$. Defaults to False.