The role of spin-orbit interaction in the ground state and thermal entanglement of a Heisenberg XYZ two-qubit system in the presence of an inhomogeneous magnetic field is investigated. We show that the ground state ...

A bipartite state is classical with respect to party A if and only if party A can perform nondisruptive local state identification (NDLID) by a projective measurement. Motivated by this we introduce a class of quantum ...

Due to the axioms of quantum mechanics, perfect cloning of an unknown quantum state is impossible. But

since imperfect cloning is still possible, a question arises: “Is there an optimal quantum cloning machine?”