Strong low-frequency quantum correlations from a four-wave mixing amplifier

Abstract

We show that a simple scheme based on nondegenerate four-wave mixing in a hot atomic vapor behaves like a near-perfect phase-insensitive optical amplifier, which can generate bright twin beams with a measured quantum noise reduction in the intensity difference of more than 8 dB, close to the best optical parametric amplifiers and oscillators. The absence of a cavity makes the system immune to external perturbations, and the strong quantum noise reduction is observed over a large frequency range.

4 pages, 4 figures. Major rewrite of the previous version. New experimental results and further analysis

References in corpus (4)

• Observation of squeezed light with 10dB quantum noise reduction
• Strong relative intensity squeezing by 4-wave mixing in Rb vapor
• Generation of spatially broadband twin beams for quantum imaging
• Ultraslow propagation of matched pulses by four-wave mixing in an atomic vapor