qiskit.quantum_info.DensityMatrix.reverse_qargs

DensityMatrix.reverse_qargs()

Return a DensityMatrix with reversed subsystem ordering.

For a tensor product state this is equivalent to reversing the order of tensor product subsystems. For a density matrix \(\rho = \rho_{n-1} \otimes ... \otimes \rho_0\) the returned state will be \(\rho_0 \otimes ... \otimes \rho_{n-1}\).

Returns

the state with reversed subsystem order.

Return type

DensityMatrix