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

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arXiv:2604.18832v1 Announce Type: new 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 i

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Quantum Physics [Submitted on 20 Apr 2026] High-flux sub-Poissonian twin-beam generation from warm atomic vapor Priya Drashni, Hari P. Lamsal, Belle A. White, Noah A. Crum, George Siopsis, Tian Li 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 \chi^{(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. Comments: 10 pages, 6 figures, 3 tables Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.18832 [quant-ph] (or arXiv:2604.18832v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.18832 Focus to learn more Submission history From: Tian Li [view email] [v1] Mon, 20 Apr 2026 20:55:31 UTC (502 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev | next > new | recent | 2026-04 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)

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