Partially separable criterion and classification of states in multipartite systems with an arbitrary finite number of qubits
Abstract
Description
After introducing the partially separable concept, we proved the equivalence between the partial separability of a given $m$-partite subsystem with $m$ qubits and the purity of states of this $m$-partite subsystem for a pure state in multipartite systems with arbitrary finite $n(>m)$ qubits. Furthermore, we give out the operational realizations (corollaries) of our theorem, which are the sufficient and necessary criterions of partial separability of states and can be used to classification of states. Our results are helpful to understand and describe quantum entanglement in multipartite systems.
Revised Version, 8 pages, no fig. Improved the expression of our theorem and brought our key conclusion into prominence
Revised Version, 8 pages, no fig. Improved the expression of our theorem and brought our key conclusion into prominence