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A on R, B on L
The phase of the other crossed branch pair. It is also subtracted in the local-phase-invariant combination.
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How Much of Gravitationally Induced Entanglement Is in the Eye of the Frame · Equation 7
This alternating sum isolates the branch-phase difference that local phase choices cannot remove. In the ideal balanced state, it controls whether the two path qubits are entangled.
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