Propagation of perfect Laguerre–Gaussian entangled states in non-Kolmogorov atmospheric turbulence

Abstract

We investigate the impacts of backward scattering (BS) of non-Kolmogorov turbulence on the entangled perfect Laguerre–Gaussian (PLG) beams. The explicit expressions for PLG quantum entanglement and quantum coherence are derived in the BS case. We find that the introduction of BS reduces the entanglement and coherence, disrupts the initial decay characteristics, and induces the revival of entanglement and coherence, in which sense turbulence may possess a non-Markovian (memory) effect. As the OAM number increases, the non-Markovian feature increases logarithmically. In addition, the universal decay of entanglement and coherence and the non-Kolmogorov effects are also explored.

Transmission characteristics of partially coherent pin-like optical vortex beams in oceanic turbulence

“…Underwater wireless optical communication (UWOC), which has the advantages of large bandwidth, high transmission rate and good confidentiality, has attracted the attention of a wide range of researchers [1,2]. Vortex beams, characterized by their possession of orbital angular momentum (OAM), with each photon carrying an OAM value of m 0 ÿ, where unlimited index m 0 represents the topological charge and ÿ is reduced Planck constant, can provide another degree of freedom for multiplexing applications due to the orthogonality among different OAM indexes [3][4][5][6][7][8]. It has been shown that the OAM multiplexing technique can significantly enhance the transmission efficiency of UWOC systems [9][10][11][12][13].…”