Symbol in context
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Editorial equation guide
The gravitational phase when A takes its L branch and B takes its L branch. It enters with a plus sign in the invariant combination.
Read equation 7 in How Much of Gravitationally Induced Entanglement Is in the Eye of the Frame →
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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