Improved measurement of two-mode quantum correlations using a phase-sensitive amplifier

• Published in: Optics express Vol. 25; no. 18; pp. 21301 - 21311
• Main Authors: Li, Tian, Anderson, Brian E, Horrom, Travis, Schmittberger, Bonnie L, Jones, Kevin M, Lett, Paul D
• Format: Journal Article
• Language: English
• Published: United States 04-09-2017
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.25.021301

We demonstrate the ability of a phase-sensitive amplifier (PSA) to pre-amplify a selected quadrature of one mode of a two-mode squeezed state in order to improve the measurement of two-mode quantum correlations that exist before degradation due to optical and detection losses. We use four-wave mixing (4WM) in
Rb vapor to generate bright beams in a two-mode squeezed state. One of these two modes then passes through a second 4WM interaction in a PSA configuration to noiselessly pre-amplify the desired quadrature of the mode before loss is intentionally introduced. We demonstrate an enhancement in the measured degree of intensity correlation and intensity-difference squeezing between the two modes.