For non-degenerate two-photon absorption, intensity-correlation measurements with double-seeded two-mode squeezed light achieve the best precision scaling (1/n^3.5), while normalized intensity correlation trades away quantum enhancement for robustness to photon loss.
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Enhancing Measurement Precision of Non-Degenerate Two-Photon Absorption
For non-degenerate two-photon absorption, intensity-correlation measurements with double-seeded two-mode squeezed light achieve the best precision scaling (1/n^3.5), while normalized intensity correlation trades away quantum enhancement for robustness to photon loss.