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

Relative-intensity squeezing at audio frequencies using four-wave mixing in an atomic vapor

Colin F. McCormick, Alberto M. Marino, Vincent Boyer, Paul D. Lett

Published Mar 13, 2007• 1 citation
OpenAlex

Abstract

We demonstrate the use of four-wave mixing in hot atomic vapor to generate up to -7.1 dB of measured relative-intensity squeezing. Due to its intrinsic simplicity, our system is strongly decoupled from environmental noise, and we observe more than -4 dB of squeezing down to frequencies as low as 5 kHz. This robust source of narrowband squeezed light may be useful for a variety of applications, such as coupling to atomic ensembles and enhancing the sensitivity of photothermal spectroscopy.

Related papers

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

Strong relative intensity squeezing by four-wave mixing in rubidium vapor

Colin F. McCormick, Vincent Boyer, E. Arimondo +1 more

We have measured -3.5 dB (-8.1 dB corrected for losses) relative intensity squeezing between probe and conjugate beams generated by stimulated, nondegenerate four-wave mixing in hot rubidium vapor. Unlike early observations of squeezing in atomic vapors based on saturation of a two-level system, our scheme uses a resonant nonlinearity based on ground-state coherences in a three-level system. Since this scheme produces narrowband, squeezed light near an atomic resonance, it is of interest for experiments involving cold atoms or atomic ensembles.

arXiv:physics/0607254•Optics Letters•Dec 21, 2006•393 citations

Multi-Spatial-Mode Squeezed Light from Four-Wave Mixing in Hot Rb Vapor

Paul D. Lett, Vincent Boyer, Alberto M. Marino +4 more

We demonstrate multi-spatial-mode, nondegenerate four-wave mixing in hot atomic Rb vapor. We generate images with strong intensity-difference squeezing between the amplified probe and the generated conjugate beams. Measurements to quantify the multi-mode nature of the beams will be presented. We also report on progress in improving the relative-intensity squeezing. This narrowband, squeezed light near an atomic resonance is also of interest for experiments involving atomic ensembles.

Quantum-Atom Optics Downunder (QAO)•Jan 1, 2007•0 citations

Realization of low frequency and controllable bandwidth squeezing based on a four-wave-mixing amplifier in rubidium vapor

Cunjin Liu, Jietai Jing, Zhifan Zhou +4 more

We experimentally demonstrate the creation of two correlated beams generated by a nondegenerate four-wave-mixing amplifier at λ=795 nm in hot rubidium vapor. We achieve intensity difference squeezing at frequencies as low as 1.5 kHz which is so far the lowest frequency to observe squeezing in an atomic system. The squeezing spans from 5.5 to 16.5 MHz with a maximum squeezing of -5 dB at 1 MHz. We can control the squeezing bandwidth by changing the pump power. Both low frequency and controllable bandwidth squeezing show great potential in sensitivity detection and precise control of the atom optics measurement.

Optics Letters•Aug 1, 2011•74 citations

Strong relative intensity squeezing by 4-wave mixing in Rb vapor

Colin F. McCormick, Vincent Boyer, Alberto M. Marino +2 more

We have measured -6.3 dB of relative intensity squeezing at 795 nm, generated by stimulated, nondegenerate four-wave mixing in a hot rubidium vapor. This scheme is of interest for experiments involving cold atoms or atomic ensembles.

Quantum Electronics and Laser Science Conference•May 1, 2007•3 citations

Compact sub-kilohertz low-frequency quantum light source based on four-wave mixing in cesium vapor

Rong Ma, Wei Liu, Zhongzhong Qin +4 more

Using a nondegenerate four-wave mixing (FWM) process based on a double-Λ scheme in hot cesium vapor, we demonstrate a compact diode-laser-pumped quantum light source for the generation of quantum correlated twin beams with a maximum squeezing of 6.5 dB. The squeezing is observed at a Fourier frequency in the audio band down to 0.7 kHz which, to the best of our knowledge, is the first observation of sub-kilohertz intensity-difference squeezing in an atomic system so far. A phase-matching condition is also investigated in our system, which confirms the spatial-multi-mode characteristics of the FWM process. Our compact low-frequency squeezed light source may find applications in quantum imaging, quantum metrology, and the transfer of optical squeezing onto a matter wave.

arXiv:1803.02882•Optics Letters•Mar 2, 2018•23 citations
We demonstrate the use of four-wave mixing in hot atomic vapor to generate up to -7.1 dB of measured relative-intensity squeezing. Due to its intrinsic simplicity, our system is strongly decoupled from environmental noise, and we observe more than -4 dB of squeezing down to frequencies as low as 5 kHz. This robust source of narrowband squeezed light may be useful for a variety of applications, such as coupling to atomic ensembles and enhancing the sensitivity of photothermal spectroscopy.
We have measured -3.5 dB (-8.1 dB corrected for losses) relative intensity squeezing between probe and conjugate beams generated by stimulated, nondegenerate four-wave mixing in hot rubidium vapor. Unlike early observations of squeezing in atomic vapors based on saturation of a two-level system, our scheme uses a resonant nonlinearity based on ground-state coherences in a three-level system. Since this scheme produces narrowband, squeezed light near an atomic resonance, it is of interest for experiments involving cold atoms or atomic ensembles.
We experimentally demonstrate the creation of two correlated beams generated by a nondegenerate four-wave-mixing amplifier at λ=795 nm in hot rubidium vapor. We achieve intensity difference squeezing at frequencies as low as 1.5 kHz which is so far the lowest frequency to observe squeezing in an atomic system. The squeezing spans from 5.5 to 16.5 MHz with a maximum squeezing of -5 dB at 1 MHz. We can control the squeezing bandwidth by changing the pump power. Both low frequency and controllable bandwidth squeezing show great potential in sensitivity detection and precise control of the atom optics measurement.
Using a nondegenerate four-wave mixing (FWM) process based on a double-Λ scheme in hot cesium vapor, we demonstrate a compact diode-laser-pumped quantum light source for the generation of quantum correlated twin beams with a maximum squeezing of 6.5 dB. The squeezing is observed at a Fourier frequency in the audio band down to 0.7 kHz which, to the best of our knowledge, is the first observation of sub-kilohertz intensity-difference squeezing in an atomic system so far. A phase-matching condition is also investigated in our system, which confirms the spatial-multi-mode characteristics of the FWM process. Our compact low-frequency squeezed light source may find applications in quantum imaging, quantum metrology, and the transfer of optical squeezing onto a matter wave.