Experimental investigation of continuous-variable quantum teleportation

Abstract

We report the experimental demonstration of quantum teleportation of the quadrature amplitudes of a light field. Our experiment was stably locked for long periods, and was analyzed in terms of fidelity $\mathcal{F}$ and with signal transfer $T_q{=T}^{+}{+T}^{-}$ and noise correlation $V_q{=V}_{\mathrm{in}\mathrm{|}\mathrm{}\mathrm{out}}^{+}{V}_{\mathrm{in}\mathrm{|}\mathrm{}\mathrm{out}}^{-}.$ We observed an optimum fidelity of $0.64\pm 0.02,$ $T_q=1.06\mathrm{}\pm 0.02,$ and $V_q=0.96\mathrm{}\pm \mathrm{0.10.}$ We discuss the significance of both $T_q>1\mathrm{}$ and $V_q<1\mathrm{}$ and their relation to the teleportation no-cloning limit.