\begin{document}${\rm{LG}}_0^0$\end{document} mode and \begin{document}${\rm{LG}}_1^0$\end{document} mode. However, the optimal pump mode is rather complicated and difficult to experimentally generate, in the alternative scheme the \begin{document}${\rm{LG}}_1^0$\end{document} mode is used as the pump field to obtain the optimal entanglement. In the experiment, the \begin{document}${\rm{LG}}_1^0$\end{document} mode is produced by converting the HG11 mode with a π/2 converter, and here the HG11 mode is achieved by tailoring the fundamental mode with a four-quadrant phase mask and a filtering cavity. Then the \begin{document}${\rm{LG}}_0^0$\end{document} mode or \begin{document}${\rm{LG}}_1^0$\end{document} mode is used as the pump field to drive the non-degenerate optical parametric amplifier operating in spatial multimode. When the non-degenerate optical parametric amplifier is operated in the de-amplification, the hyperentanglement with orbital angular momentum and spin angular momentum is produced. The output entangled beams pass through polarization beam splitter and are analyzed by using the balanced homodyne detection systems with the local oscillator operating in the HG01 and HG10. The noise of the phase quadrature or the amplitude quadrature is obtained, when the relative phase between the local oscillator and the signal beam is locked to π/2 or 0. Then the quantum correlations of orbital angular momentum and spin angular momentum can be deduced. The experimental results show that the continuous-variable hyperentanglement of light with a quantum correlation of (4.00 ± 0.02) dB is produced. Compared with the results of Liu et al. obtained by using the \begin{document}${\rm{LG}}_0^0$\end{document} mode, the inseparability of orbital angular momentum and spin angular momentum entanglement are enhanced by approximately 96.2% and 96.3%, respectively, through using the \begin{document}${\rm{LG}}_1^0$\end{document} mode. Such a continuous-variable hyperentanglement may have promising applications in high-dimensional quantum information and multi-dimensional quantum measurement, and this approach is potentially extended to a discrete variable domain."> - 必威体育下载

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    Li Juan, Li Jia-Ming, Cai Chun-Xiao, Sun Heng-Xin, Liu Kui, Gao Jiang-Rui
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    • Abstract views:6535
    • PDF Downloads:44
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    Publishing process
    • Received Date:31 August 2018
    • Accepted Date:04 November 2018
    • Available Online:01 February 2019
    • Published Online:05 February 2019

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