High-flux sub-Poissonian twin-beam generation from warm atomic vapor

• URL: http://arxiv.org/abs/2604.18832v1
• Date: Mon, 20 Apr 2026 20:55:31 GMT
• Title: High-flux sub-Poissonian twin-beam generation from warm atomic vapor
• Abstract summary: We demonstrate sub-Poissonian twin-beam generation via near-degenerate spontaneous four-wave mixing in warm $85mathrmRb$ at 795 nm.<n>Time-resolved photon counting Mandel yields parameters of $Q approx -0.7$ for each beam, revealing strong photon-number squeezing in each beam individually.<n>This fiber-compatible, near atomic-resonance, high-flux sub-Poissonian twin-photon source is well suited for integration into scalable quantum-enhanced sensing and information processing applications.
• Score: 3.8758414726088204
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate sub-Poissonian twin-beam generation via near-degenerate spontaneous four-wave mixing in warm $^{85}\mathrm{Rb}$ at 795 nm. The twin beams exhibit approximately $5.5~\mathrm{dB}$ of intensity-difference squeezing in free space and about $3~\mathrm{dB}$ after coupling into polarization-maintaining fibers. Time-resolved photon counting yields Mandel parameters of $Q \approx -0.7$ for each beam, revealing strong photon-number squeezing in each beam individually. The temporal correlation between the twin photons exhibits a distinctive flat-topped profile, reflecting multiple $χ^{(3)}$ processes in the atomic medium and showing excellent agreement with theory. This fiber-compatible, near atomic-resonance, high-flux sub-Poissonian twin-photon source is well suited for integration into scalable quantum-enhanced sensing and information processing applications.

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