Observation of nonclassical correlations in biphotons generated from an ensemble of pure two-level atoms

• URL: http://arxiv.org/abs/2108.05407v2
• Date: Mon, 17 Jan 2022 17:28:38 GMT
• Title: Observation of nonclassical correlations in biphotons generated from an ensemble of pure two-level atoms
• Authors: Michelle O. Ara\'ujo, Lucas S. Marinho and Daniel Felinto
• Abstract summary: We report the experimental verification of nonclassical correlations for a four-wave-mixing process in an ensemble of cold two-level atoms. Quantum correlations are observed in a nano-seconds timescale, in the interference between the central exciting frequency and sidebands dislocated by the detuning to the atomic resonance.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We report the experimental verification of nonclassical correlations for a four-wave-mixing process in an ensemble of cold two-level atoms, confirming theoretical predictions by Du et al. in 2007 for the violation of a Cauchy-Schwarz inequality in the system, and obtaining $R = (1.98\pm0.03) \nleq 1$. Quantum correlations are observed in a nano-seconds timescale, in the interference between the central exciting frequency and sidebands dislocated by the detuning to the atomic resonance. They prevail without filters over the noise background coming from linear scattering from the same optical transition. These correlations are fragile with respect to processes that disturb the phase of the atomic excitation, but are robust to variations in number of atoms and to increasing light intensities.

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