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arXiv · 2512.15655

Characterization of Generalized Coherent States through Intensity-Field Correlations

Ignacio Salinas Valdivieso·Victor Gondret·Gerd Hartmann S.·Mariano Uria·Pablo Solano·Carla Hermann-Avigliano
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Abstract

Non-Gaussian quantum states of light are essential resources for quantum information processing and precision metrology. Among them, generalized coherent states (GCS), which naturally arise from the evolution of a coherent state with a nonlinear medium, exhibit useful quantum features such as Wigner negativity and metrological advantages [Phys. Rev. Res. 5, 013165 (2023)]. Because these states remain coherent to all orders, their nonclassical character cannot be revealed through standard intensity-intensity correlation measurements. Here, we demonstrate that the intensity-field correlation function alone provides a simple and experimentally accessible witness of nonclassicality. For GCSs, any deviation of this normalized correlation from unity signals nonclassical behavior. We derive analytical results for Kerr-generated states and extend the analysis to statistical mixtures of GCSs. The proposed approach enables real-time, low-complexity detection of quantum signatures in non-Gaussian states, offering a practical tool for experiments across a broad range of nonlinear regimes.

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Ignacio Salinas Valdivieso, Victor Gondret, Gerd Hartmann S., Mariano Uria, Pablo Solano, Carla Hermann-Avigliano. 2026-06-07. Characterization of Generalized Coherent States through Intensity-Field Correlations. https://doi.org/10.1103/lykp-833h

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