An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Strong Low-Frequency Quantum Correlations From a Four-Wave Mixing Amplifier
Published
Author(s)
C F. McCormick, Alberto M. Marino, V Boyer, Paul D. Lett
Abstract
Quantum-correlated light displays sub-classical noise fluctuations between frequency sidebands on a single beam (quadrature squeezing) or between the intensities or phases of different beams (two-mode squeezing). Exploiting this noise reduction can improve the accuracy of optical measurements or enable quantum information processing. We have developed a simple and robust source for generating quantum-correlated light based on single-pass four-wave-mixing amplification in an atomic vapor. Pairs of light beams from the source are narrowband, tuned near an atomic resonance, and display more than 8 dB of noise reduction in their intensity difference. In addition, the source's immunity to environmental noise permits the noise reduction to extend deep into the audio range, making it useful for a number of applications. Most notably, it is suitable for use with atom-based quantum memories. A distributed gain/loss model quantitatively fits our measurements and allows us to predict the optimum conditions for the source's operation. The present phase-insensitive amplifier should be easily adaptable to phase-sensitive amplification and the generation of bright-beam and vacuum quadrature squeezing.
McCormick, C.
, Marino, A.
, Boyer, V.
and Lett, P.
(2008),
Strong Low-Frequency Quantum Correlations From a Four-Wave Mixing Amplifier, Nature Physics
(Accessed December 10, 2023)