2002/04/04 by Nicolas Treps, N. Treps, Ulrik L. Andersen +11 · 10 citations
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Mechanical and Optical Resonators #Photonic and Optical Devices #quant-ph
paper · pdf · doi:10.1103/physrevlett.88.203601
published as Phys. Rev. Lett. 88, 203601 (2002) · 4 pages, 5 figures
arxiv created 2002/04/04 · openalex publication_date 2002/05/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Using continuous wave superposition of spatial modes, we demonstrate experimentally displacement measurement of a light beam below the standard quantum limit. Multimode squeezed light is obtained by mixing a vacuum squeezed beam and a coherent beam that are spatially orthogonal. Although the resultant beam is not squeezed, it is shown to have strong internal spatial correlations. We show that the position of such a light beam can be measured using a split detector with an increased precision compared to a classical beam. This method can be used to improve the sensitivity of small displacement measurements.