The quantum laser pointer and other applications of squeezed light

Abstract

The quantum nature of light imposes a limit to the detection of all properties of a laser beam. We show how we can reduce this limit for a measurement of the position of a light beam on a quadrant detector, simultaneously in two transverse directions. This quantum laser pointer can measure the beam direction with greater precision than a usual laser. We achieve this by combining three beams, one intense coherent and two vacuum squeezed beams, with minimum losses into one spatially multimode beam optimized for this application. Show more