Multipartite entanglement serves as a faithful detector for quantum phase transitions

Multipartite entanglement serves as a faithful detector for quantum phase transitions

Blog Article

We investigate quantum phase transitions (QPTs) in various spin chain systems using the multipartite entanglement measure $ au_mathrm{SEF}$ based on the monogamy inequality of squared entanglement of formation (EOF).Our results demonstrate that $ au_mathrm{SEF}$ is more effective and reliable than bipartite entanglement or bipartite correlation measures such as EOF, von Neumann Car Model Kit entropy, and quantum discord in characterizing QPTs.$ au_mathrm{SEF}$ not only detects critical points that may go unnoticed by other detectors but also avoids the issue Armored Vehicle of singularity at non-critical points encountered by other measures.Furthermore, by applying $ au_mathrm{SEF}$ , we have obtained the phase diagram for the XY spin chain with three and four interactions and discovered a new quantum phase.