High-fidelity quantum teleportation toward cubic phase gates beyond the no-cloning limit
Qingwei Wang, Yuhang Tian, Wei Li, Long Tian, Yajun Wang, Yaohui Zheng
Abstract
High-fidelity quantum teleportation is necessary to configure a cubic phase gate that enables the processing of the nonclassicality in an input quantum state. The noise variance of the antisqueezing component, which increases rapidly with a higher pump factor, contaminates the squeezing component due to the phase fluctuation and results in a reduction of the fidelity. Here, we balance the influence of the extraction loss and phase fluctuation on the fidelity and optimize the performance of quantum teleportation. As a result, a fidelity $F=0.905\ifmmode\pm\else\textpm\fi{}0.022$ is experimentally achieved. The ultrahigh fidelity is expected to configure a cubic phase gate involving four-time sequential teleportation to perform universal continuous-variable quantum information processing.