Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Toward 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 demonstrated an off-resonance intensity gain of more than 1.3 via double-ladder Four-Wave Mixing (FWM) process, and indicated preliminary evidence of beam noise correlation, suggesting the possibility of achieving bi-chromatic intensity squeezing.
DOI
10.1364/cleo_at.2024.jw2a.135

Related papers

Toward bi-chromatic intensity squeezing using double-ladder four-wave mixing in 85Rb

Ziqi Niu, Jianming Wen, Chuanwei Zhang +2 more

We optimize the strength of the Four-Wave Mixing (FWM) in warm 85Rb atoms in a double-ladder scheme to identify the optimal conditions for generating the bi-chromatic intensity squeezing. By optimizing the experimental parameters, such as laser frequency and intensity, cell temperature, beam geometry, etc., we achieved FWM gain up to 1.92 with only modest resonant optical losses, and observed some preliminary evidence of the noise correlations between the amplified probe and generated stokes optical field.

Optical and Quantum Sensing and Precision Metrology II•Mar 13, 2024•1 citation

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

Ziqi Niu, Jianming Wen, Chuanwei Zhang +2 more

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.

Frontiers in Optics•Jan 1, 2024•0 citations

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

Ziqi Niu, Jianming Wen, Chuanwei Zhang +2 more

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.

Optica Quantum•Jan 7, 2025•1 citation

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

Ziqi Niu, Jianming Wen, Chuanwei Zhang +2 more

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.

•Oct 17, 2024•0 citations

Strong Relative-Intensity Squeezing of Light from Four-Wave Mixing in Hot Rb Vapor

Paul D. Lett, Vincent Boyer, Alberto M. Marino +2 more

We use nondegenerate four-wave mixing in hot atomic vapor to generate up to −7.1dB of relative-intensity squeezing between the probe and conjugate beams. This narrowband, multispatial-mode, squeezed light near an atomic resonance is of interest for image processing as well as experiments involving atomic ensembles.

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting•Jan 1, 2007•1 citation

Twin-beam intensity-difference squeezing below 10 Hz

Meng-Chang Wu, Bonnie L. Schmittberger, Nicholas R. Brewer +3 more

We report the generation of strong, bright-beam intensity-difference squeezing down to measurement frequencies below 10 Hz. We generate two-mode squeezing in a four-wave mixing (4WM) process in Rb vapor, where the single-pass-gain nonlinear process does not require cavity locking and only relies on passive stability. We use diode laser technology and several techniques, including dual seeding, to remove the noise introduced by seeding the 4WM process as well as the background noise. Twin-beam intensity-difference squeezing down to frequencies limited only by the mechanical and atmospheric stability of the lab is achieved. These results should enable important low-frequency applications such as direct intensity-difference imaging with bright beams on integrating detectors.

arXiv:1810.09589•Optics Express•Feb 8, 2019•23 citations
We optimize the strength of the Four-Wave Mixing (FWM) in warm 85Rb atoms in a double-ladder scheme to identify the optimal conditions for generating the bi-chromatic intensity squeezing. By optimizing the experimental parameters, such as laser frequency and intensity, cell temperature, beam geometry, etc., we achieved FWM gain up to 1.92 with only modest resonant optical losses, and observed some preliminary evidence of the noise correlations between the amplified probe and generated stokes optical field.
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.
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.
We report the generation of strong, bright-beam intensity-difference squeezing down to measurement frequencies below 10 Hz. We generate two-mode squeezing in a four-wave mixing (4WM) process in Rb vapor, where the single-pass-gain nonlinear process does not require cavity locking and only relies on passive stability. We use diode laser technology and several techniques, including dual seeding, to remove the noise introduced by seeding the 4WM process as well as the background noise. Twin-beam intensity-difference squeezing down to frequencies limited only by the mechanical and atmospheric stability of the lab is achieved. These results should enable important low-frequency applications such as direct intensity-difference imaging with bright beams on integrating detectors.