The quantum limit for phase-gradient measurement scales inversely with beam width, with a factor-of-2 improvement from a maximally entangled two-photon state, but the paper's interferometer precision formulas contain algebraic errors.
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Quantum-Limited Estimation of Phase Gradient
The quantum limit for phase-gradient measurement scales inversely with beam width, with a factor-of-2 improvement from a maximally entangled two-photon state, but the paper's interferometer precision formulas contain algebraic errors.