2007/08/02 by T. Wang, L. Zhao, Lu Zhao +4
Computer Science · Physics and Astronomy · #Coherence (philosophical gambling strategy) #Coherence time #Condensed matter physics #Diffusion #Mechanical and Optical Resonators #Mechanics #Optical vortex #Physics #Quantum #Quantum Information and Cryptography #Quantum decoherence #Quantum mechanics #Quantum optics and atomic interactions #Vortex #quant-ph
paper · pdf · doi:10.1103/physreva.77.043815
5 pages, 2 figures
arxiv created 2007/08/02 · openalex publication_date 2008/04/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the coherence properties of optical vortices stored in atomic ensembles. In the presence of thermal diffusion, the topological nature of stored optical vortices is found not to guarantee slow decoherence. Instead the stored vortex state's decoherence is surprisingly larger than the stored Gaussian mode. Furthermore, calculation of the coherence factor shows that the center of the stored vortex becomes completely incoherent once diffusion begins and, when a reading laser is applied, the optical intensity at the center of the vortex becomes nonzero. Its implication for quantum information is discussed. A comparison of classical diffusion and quantum diffusion is also presented.