Perhaps ishopaniSat (iisha upanishad) describes quantum entanglement in the 5th shloka(?):
tadejati tannaijati taddUre tadvantike | tadantarasya sarvasya tadu sarvasyAsya bAhyataH || 5|| Attempt at sandhi vigraha: tat ejati tat na ejati tat duure tat u antike | tat antaH asya sarvasya tat u sarvasya asya baahyataH || 5|| 5. That moves, yet moves not. That is far, and yet That is near. That is within everything, yet also outside everything.