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Prospects for reaching persistent entanglement between two spatiallyseparated atomic Bose-Einstein condensates are outlined. The system set-upcomprises of two condensates loaded in an optical lattice, which, in return, isconfined within a high-Q optical resonator. The system is driven by an externallaser that illuminates the atoms such that photons can scatter into the cavity.In the superradiant phase a cavity field is established and we show that theemerging cavity mediated interactions between the two condensates is capable ofentangling them despite photon losses. This macroscopic atomic entanglement issustained throughout the time-evolution apart from occasions of suddendeaths/births. Using an auxiliary photon mode and coupling it to a collectivequadrature of the two condensates we demonstrate that the auxiliary mode'ssqueezing is proportional to the atomic entanglement and as such it can serveas a probe field of the macroscopic entanglement.

Cavity assisted generation of sustainable macroscopic entanglement of ultracold gases