scqubits.core.operators.cos_theta_harmonic¶

scqubits.core.operators.cos_theta_harmonic(dimension, prefactor=None)[source]¶

Operator matrix for cos(prefactor(\(a+a^\dagger\))) of size dimension x dimension in sparse matrix representation.

Parameters:

dimension (int) – matrix size
prefactor (Optional[Union`[:py:class:`float, complex]]) – prefactor multiplying the number operator matrix (if not given, this defaults to 1)

Return type:

Returns:

prefactor * (\(a+a^\dagger\)) as ndarray, size dimension x dimension