Local transformations of superpositions of entangled states

Iulia Ghiu

Suppose that we have two entangled states $|{\varphi }_1⟩$, $|{\psi }_1⟩$ that cannot be converted to any of other two states $|{\varphi }_2⟩$, $|{\psi }_2⟩$ by local operations and classical c…