Abstract

We report the first experimental demonstration of a cancellation of back-action noise in ultra-sensitive interferometric measurements. Our setup is based upon a high-finesse optical cavity with movable mirrors and achieved a sensitivity of 1×10⁻²⁰ m/√Hz. Using an intensity-modulated intracavity light beam to mimic the quantum noise of radiation-pressure we demonstrate a sensitivity improvement both in displacement and weak force measurements. Further improvements will allow to observe quantum effects of radiation pressure.

© 2007 Optical Society of America