Experimental generation of a high-fidelity four-photon linear cluster state
Experimental generation of a high-fidelity four-photon linear cluster state
Cluster state plays a crucial role in one-way quantum computation. Here, we propose and experimentally demonstrate a scheme to prepare an ultrahigh-fidelity four-photon linear cluster state via a spontaneous parametric down-conversion process. The state fidelity is measured to be $0.9517\ifmmode\pm\else\textpm\fi{}0.0027$. Our scheme can be directly extended to more photons to …