Detection of multipartite entanglement via quantum Fisher information
Yan Hong, Xianfei Qi, Ting Gao, Fengli Yan · Europhysics Letters (EPL) · 2021
In this paper, we focus on two different kinds of multipartite correlation, k -nonseparability and k -partite entanglement, both of which can describe the essential characteristics of multipartite entanglement. We propose effective methods to detect k -nonseparability and k -partite entanglement in terms of quantum Fisher information. We illustrate the significance of our results and show that they identify some k -nonseparability and k -partite entanglement that cannot be identified by known criteria by several concrete examples.