Entanglement performance of light through the composite free space channel

Abstract Entanglement transmission is utilized widely in quantum communication. In this paper we establish a model, which characterizes the performance of entanglement state passing through composite free space channel. This channel compounded with atmosphere, sea surface and underwater Based on photon pairs transmitted are simulated. Simulation results show that beam wandering, incident angle surface, concentration chlorophyll seawater other factors will lead to degradation these have nonlinear relationship transmittance. Moreover, increase found be relatively heavy impact entanglement. addition, expanding aperture size receiving telescope improve The research has momentous meaning space. What’s more, an extremely vital reference value for communications diverse natural environments.