Open AccessEntanglement protection of Ince-Gauss modes in atmospheric turbulence using adaptive optics
Author(s) -
Kuntuo Zhu,
Zili Lin,
Liuguo Yin,
Chuan Wang,
Gui Lu Long
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.408934
Subject(s) - physics , paraxial approximation , quantum entanglement , adaptive optics , angular momentum , geometrical optics , orbital angular momentum multiplexing , optics , orbital angular momentum of light , quantum optics , quantum mechanics , physical optics , classical mechanics , total angular momentum quantum number , quantum , beam (structure)
In this paper, we describe the study of the faithful propagation of entangled orbital angular momentum states of light under atmospheric turbulence. The spatial mode is encoded in the Ince-Gauss modes that constitute a complete family of exact and orthogonal solutions of the paraxial wave equation in an elliptic coordinate system. Adaptive optics is employed to protect the entanglement from degradation, in which the threshold of turbulence strength could be enhanced for a reliable entanglement distribution. We find that the evolution of entanglements relies on ellipticity and shows the opposite trend when adopting adaptive optics. The turbulence strengths, at which the concurrences of various entangled states become zero, are different without adaptive optics but almost the same with adaptive optics. The trace of the density matrix is independent of the different ellipticity with or without adaptive optics. We believe that this investigation is useful for long-distance quantum communications and quantum networks using orbital angular momentum as information carriers.