Characterizing the nonlocal correlations of particles that never interacted

Quantum systems that have never interacted can become nonlo cally correlated through a process called entanglement swapping. To characterize nonlocality in this c ontext, we introduce local models where quantum systems that are initially uncorrelated are described by un correlated local variables. While a pair of maximally entangled qubits prepared in the usual way (i.e., emitted fr om a common source) requires a visibility close to 70% to violate a Bell inequality, we show that an entangled pair g enerated through entanglement swapping will already violate a Bell inequality for visibilities as low as 50% under our assumption.