Certification of Genuine Multipartite Entanglement with General and Robust Device-independent Witnesses
Chao Zhang, Wen-Hao Zhang, Pavel Sekatski, Jean-Daniel Bancal, Michael, Zwerger, Peng Yin, Gong-Chu Li, Xing-Xiang Peng, Lei Chen, Yong-Jian Han,, Jin-Shi Xu, Yun-Feng Huang, Geng Chen, Chuan-Feng Li, Guang-Can Guo

TL;DR
This paper introduces a robust, general device-independent method for certifying and quantifying genuine multipartite entanglement in quantum states using only bipartite Bell inequalities, applicable to various realistic states.
Contribution
The authors develop a new DI approach that works for arbitrary finite-dimensional multipartite states, overcoming limitations of previous methods requiring full state knowledge.
Findings
Successfully certifies genuine multipartite entanglement in various states
Detects entanglement in weakly-entangled GHZ states
Applicable to realistic, noisy quantum states
Abstract
Genuine multipartite entanglement represents the strongest type of entanglement, which is an essential resource for quantum information processing. Standard methods to detect genuine multipartite entanglement, e.g., entanglement witnesses, state tomography, or quantum state verification, require full knowledge of the Hilbert space dimension and precise calibration of measurement devices, which are usually difficult to acquire in an experiment. The most radical way to overcome these problems is to detect entanglement solely based on the Bell-like correlations of measurement outcomes collected in the experiment, namely, device-independently (DI). However, it is difficult to certify genuine entanglement of practical multipartite states in this way, and even more difficult to quantify it, due to the difficulty to identify optimal multipartite Bell inequalities and protocols tolerant to…
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Taxonomy
TopicsQuantum Information and Cryptography · Quantum Mechanics and Applications · Quantum Computing Algorithms and Architecture
