We find two two-qubit bipartite states ρ1,ρ2 such that arbitrarily many copies of one or the other cannot exhibit nonlocal correlations in a two-setting-two-outcome Bell scenario. However, the bipartite state ρ1-ρ2 violates the Clauser-Horne-Shimony- Holt (CHSH) Bell inequality by an amount of 2.023. We also identify a CHSH-local state ρ such that ρ-2 is CHSH inequality-violating. The tools employed can be easily adapted to find instances of nonlocality activation in arbitrary Bell scenarios.
ASJC Scopus subject areas
- Physics and Astronomy(all)