Robust violation of a multipartite Bell inequality from the perspective
of a single-system game
- URL: http://arxiv.org/abs/2202.05980v2
- Date: Wed, 8 Jun 2022 04:29:53 GMT
- Title: Robust violation of a multipartite Bell inequality from the perspective
of a single-system game
- Authors: Gang-Gang He and Xing-Yan Fan and Fu-Lin Zhang
- Abstract summary: We map the inequality to the CHSH game, and consequently to the CHSH* game in a single-qubit system.
We show that the degeneracy of the generalized CHSH operators correspond to the symmetry of the maximally entangled two-qubit states.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Recently, Fan \textit{et al.} [Mod. Phys. Lett. A 36, 2150223 (2021)],
presented a generalized Clauser-Horne-Shimony-Holt (CHSH) inequality, to
identify $N$-qubit Greenberger-Horne-Zeilinger (GHZ) states. They showed an
interesting phenomenon that the maximal violation of the generalized CHSH
inequality is robust under some specific noises. In this work, we map the
inequality to the CHSH game, and consequently to the CHSH* game in a
single-qubit system. This mapping provides an explanation for the robust
violations in $N$-qubit systems. Namely, the robust violations, resulting from
the degeneracy of the generalized CHSH operators correspond to the symmetry of
the maximally entangled two-qubit states and the identity transformation in the
single-qubit game. This explanation enables us to exactly demonstrate that the
degeneracy is $2^{N-2}$.
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