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Frontiers in Optics

Bi-chromatic Intensity Squeezing at Telecom Wavelength using Four-Wave Mixing in Rb Vapor

Ziqi Niu, Jianming Wen, Chuanwei Zhang, Shengwang Du, Irina V. Novikova

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We optimized four-wave mixing gain in a double-ladder system in Rb vapor, and observed more than 2dB of two-mode intensity squeezing between amplified 795nm probe and generated 1324nm conjugate optical fields.
DOI
10.1364/fio.2024.jw5a.53

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We experimentally investigate four-wave mixing (FWM) in a diamond interaction scheme using ⁸⁵Rb vapor, and identify the optimal conditions for joint amplification and relative intensity squeezing of two optical fields: one near the ⁸⁵Rb D1 optical transition (λ = 794.6 nm) and the other in the telecom O-band (λ = 1324 nm). We achieved a reduction of relative intensity noise by up to 2.6 ± 0.4 dB compared to the shot noise level, signi- fying the non-classical quantum correlations. The ob- served level of intensity squeezing is primarily limited by the available pump laser power, which constrains the achievable FWM gain. Numerical simulations show good agreement with the experimental results.