Editorial equation guide
Entangling phase difference
The phase combination left after local phases of A and B cancel. It compares matching branch pairs (LL and RR) with crossed pairs (LR and RL). In an ideal balanced, pure two-branch state, its value modulo 2π determines the generated two-qubit entanglement.
Read equation 7 in How Much of Gravitationally Induced Entanglement Is in the Eye of the Frame →