Regarding the Maximal Qubit Violations of n-Locality in Star and Chain Networks

Abstract

The nonlocal correlations of noisy quantum systems are important for both understanding nature and developing quantum technology. We consider the correlations of star and chain quantum networks where noisy entanglement sources are measured by nonsignaling parties. When pairs of local dichotomic observables are considered on qubit systems, we derive maximal n-local violations that are larger and more robust to noise than the maximal n-local violations reported previously. To obtain these larger values, we consider observables overlooked in the previous studies. Thus, we gain new insights into self-testing measurements and entanglement sources in star and chain networks.

7 pages, 3 figures

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Cited by in corpus (3)

• Variational Quantum Optimization of Nonlocality in Noisy Quantum Networks
• Proposals for ruling out the real quantum theories in an entanglement-swapping quantum network with causally independent sources
• $(n,m,p)$-type quantum network configuration and its nonlocality