[NTHstars (OP)]

This article ( newbielink:https://bit.ly/2DXLsxG [nonactive]) and others like it discuss entanglement across time, instead of spatially. The idea is take two entangled photons, get information on one ("killing it") and let the other keep going. Then entangle the survivor with one of a new pair of entangled photons, which now correlates our original dead photon with the new photon NOT entangled with the survivor. My question is...how long could you keep this game of information "leapfrog" going? Is there any sense if the correlations from the original photon to the "new" photons slowly decrease? I'm not sure even sure what "decrease" means technically, but hopefully my intent is clear. I assume they share a wave function. Is it binary, and they are either correlated or not? Thanks...