Exploring Bell inequalities for the device-independent certification of multipartite entanglement depth

Pei Sheng Lin, Jui Chen Hung, Ching Hsu Chen, Yeong Cherng Liang

研究成果: Article同行評審

5 引文 斯高帕斯(Scopus)

摘要

Techniques developed for device-independent characterizations allow one to certify certain physical properties of quantum systems without assuming any knowledge of their internal workings. Such a certification, however, often relies on the employment of device-independent witnesses catered for the particular property of interest. In this work, we consider a one-parameter family of multipartite, two-setting, two-outcome Bell inequalities and demonstrate the extent to which they are suited for the device-independent certification of genuine many-body entanglement (and hence the entanglement depth) present in certain well-known multipartite quantum states, including the generalized Greenberger-Horne-Zeilinger (GHZ) states with unbalanced weights, the higher-dimensional generalizations of balanced GHZ states, and the W states. As a by-product of our investigations, we have found that, in contrast with well-established results, provided trivial qubit measurements are allowed, full-correlation Bell inequalities can also be used to demonstrate the nonlocality of weakly entangled unbalanced-weight GHZ states. Besides, we also demonstrate how two-setting, two-outcome Bell inequalities can be constructed, based on the so-called GHZ paradox, to witness the entanglement depth of various graph states, including the ring graph states, the fully connected graph states, and some linear graph states, etc.

原文English
文章編號062338
期刊Physical Review A
99
發行號6
DOIs
出版狀態Published - 2019 六月 27

All Science Journal Classification (ASJC) codes

  • 原子與分子物理與光學

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