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Quantum-limited determination of refractive index difference by means of entanglement

Quantum-limited determination of refractive index difference by means of entanglement

Abstract Shaping single-mode operation in high-power fibers requires a precise knowledge of the gain-medium optical properties. This requires precise measurements of the refractive index differences (Δ n ) between the core and the cladding of the fiber. We exploit a quantum optical method based on low-coherence Hong-Ou-Mandel interferometry to perform …