Entanglement, purity and fidelity in the anisotropy mixed-spin system

✍ Scribed by Zhe Sun; Xiaoguang Wang; Heng-Na Xiong

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 577 KB
• Volume: 388
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/j.physa.2008.12.054

✦ Synopsis

We study entanglement, purity and fidelity in the anisotropy (1/2, 1) mixed-spin Heisenberg chain. We find that negativity, as a measure of entanglement, displays a dip at the SU(2) isotropic point of the system, which is in contrast to the peak appearance of concurrence in the spin-1/2 XXZ chain. Moreover, at the isotropic point, purity gives a minimum, while the mixed-state fidelity susceptibility emerges a maximum.