qiskit.opflow.state_fns.CircuitStateFn.to_density_matrix¶

CircuitStateFn.to_density_matrix(massive=False)[source]¶

Return numpy matrix of density operator, warn if more than 16 qubits to force the user to set massive=True if they want such a large matrix. Generally big methods like this should require the use of a converter, but in this case a convenience method for quick hacking and access to classical tools is appropriate.