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Effect of Absorptivity Oceanic Turbulence on the Concurrence of Spatial Two-qubit States

Wootters’s concurrence is a physical quantity that quantitatively describes the degree of entanglement of two qubit states. The concurrence of spatial entangled two-qubit states produced by spontaneous parametric down transform in turbulent adsorbent seawater is presented. The Kolmogorov ocean spectrum and structural constants of the salinity-temperature fluctuation are presented, which can simplify the complexity of the study of the turbulence effects of light wave transport in weakly turbulent oceans. The optimization parameters of the information source system corresponding to the transmission rate of high concurrence are also explored. The results show that the parameters of the spontaneous parametric down transform will make a great impact on the concurrence. The smaller interval between the two signal apertures and the interval between the signal and the idle apertures will make the communication system have higher transmission fidelity of the concurrence. The concurrence can maintain higher in the oceanic turbulence with small the rate of dissipation of mean-square temperature and large rate of dissipation of kinetic energy per unit mass of fluid. These results are of great significance for the design of an underwater optical quantum communication system with optimal concurrence transmission.