In the QuTip backend, current the the density_operator method takes one qubit at a time. This prevents getting the density matrix of a joint system. This can be easily modified to get the density matrix for a list of qubits which would make it more useful.
In the QuTip backend, current the the
density_operatormethod takes one qubit at a time. This prevents getting the density matrix of a joint system. This can be easily modified to get the density matrix for a list of qubits which would make it more useful.