A sufficient entanglement criterion based on quantum fisher information and variance. (6th May 2020)

• Record Type: Journal Article
• Authors: Zhang, Qing-Hua; Fei, Shao-Ming
• Is Part Of: Laser physics letters. Volume 17:Number 6(2020:Jun.)
• Publication Date: 2020-05-06
• Subjects: multipartite entanglement -- separability criterion -- quantum Fisher information -- variance; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/ab8793
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: We derive criterion in the form of inequality based on quantum Fisher information and quantum variance to detect multipartite entanglement. It can be regarded as complementary of the well-established positive partial transpose criterion in the sense that it can also detect bound entangled states. The inequality is motivated by Y Akbari-Kourbolagh et al [Phys. Rev A. 99, 012304 (2019)], which introduced a multipartite entanglement criterion based on quantum Fisher information. Our criterion is experimentally measurable for detecting any N -qudit pure state mixed with white noisy. We take several examples to illustrate that our criterion has good performance for detecting certain entangled states.