Lemaitre I think was the first to notice the connection between Gravity and Quantum Entanglement. This later was called ER=EPR and by Susskind you see there is an approach in which there are worm holes between entangled states. But in a paper sometime after 1930 [after Lemaitre predicted the Big Bang] he wrote that only after there were enough quanta round could space time begin to exist.
This was basically forgotten until Yaakov Beckstein saw that the area of a black hole is the same as its entropy. --suggesting that black holes have entropy which means that there is a connection between curved space and ensembles of entangled states.
[But in 1972, when he showed this, not one knew what the entangled states were.] Only much later did Susskind come along and show that ER [worm holes]= EPR [quantum entangled states]
