M-Flip Concurrence in the Framework of Multipartite Spin Coherent States
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In this paper, we propose a useful practical way to investigate and control the amount of entanglement in multipartite systems using the spin coherent states (SCSs). Using the M-Flip concurrence as a measure of entanglement, we derive the amount of entanglement and examine its properties in terms of different parameters involved in the SCSs and giving conditions under which tripartite entangled states become sparable and maximally entangled states. It is shown that these entangled SCSs provide a good candidate and richer structure for understanding the entanglement distribution in GHZ states. Finally, a useful relationship of the entanglements between multipartite systems containing different number of qubits is given in terms of bipartite entanglement in this representation of entangled multipartite SCSs. Our result may open new perspectives in different tasks of quantum information processing.