Bachor, HansDelaubert, VHarb, CharlesHsu, MagnusLam, Ping KoyFabre, ClaudeTreps, Nicolas2015-12-070950-0340http://hdl.handle.net/1885/21039The application of quantum optics to spatial measurements with continuous-wave laser beams is discussed. In particular, we summarize the work on measuring small displacements and tilt. We present the required theoretical multi-mode model and discuss how it applies to split detectors and spatial homodyne detectors. We show how spatial measurements can be improved using squeezed light. Finally, we present a demonstration of improved spatial homodyne measurements using squeezed light in a higher order spatial mode.Keywords: Laser beams; Light; Mathematical models; Measurement theory; Photodetectors; Continuous-wave laser beams; Multi-mode model; Spatial quantum effects; Quantum optics200610.1080/095003405001676282015-12-07