Bi-chromatic intensity squeezing using four-wave mixing in ⁸⁵ Rb vapor

Journal Article · 30 January 2025 · Optica Quantum

DOI: https://doi.org/10.1364/OPTICAQ.545134 · OSTI ID:2507482

Niu, Ziqi ; Wen, Jianming ; Zhang, Chuanwei; Du, Shengwang ; Novikova, Irina

We experimentally investigate four-wave mixing (FWM) in a diamond interaction scheme using ⁸⁵ Rb vapor, and identify the optimal conditions for joint amplification and relative intensity squeezing of two optical fields: one near the ⁸⁵ Rb D ₁ 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 with the shot noise level, signifying the non-classical quantum correlations. The observed 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.

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0022069
• OSTI ID: 2507482
• Journal Information: Optica Quantum, Journal Name: Optica Quantum Journal Issue: 1 Vol. 3; ISSN 2837-6714
• Publisher: Optical Society of AmericaCopyright Statement
• Country of Publication: United States
• Language: English