Qubism: Self-similar visualization of many-body wavefunctions in Python (2014)

If the plot is a product of them, the state is a product state. As writing a wavefunction as a matrix $|\psi\rangle_{ij}$ is the the crucial step in Schmidt decomposition, we call such plots Schmidt plots. Let us consider two states:

They may look seamingly similar, but the later can be decomposed into a product $|0\rangle(|1\rangle – |0\rangle)/\sqrt{2}$.

Source: nbviewer.jupyter.org