Quantum Dense coding and Quantum Teleportation

StateTeleportation of a composite system----ResultFidelityFidelity withnoise reductionFidelity:HVHV-VH0.86±0.030.60±0.030.97±0.030.71±0.03Pure stateF=iniψψTel2(H+V)(H-iV)0.75±0.020.83±0.02Mixed stateF = Tr( ρ ψ ψ )iniAverage0.74±0.030.84±0.03Well beyond theclone limit 0.40[A. Hayashi et al., Phys. Rev. A. 72, 032325 (2005).]Teleported State of HV-VH is Still Entangled!Tr(ρW)1= Tr[ρ(HH2+ − − − − −HHRL= −0.23± 0.04 < 0+RLVV−LRVV[M. Barbieri, et al. Phys. Rev. Lett. 91, 227901 (2003).]+LR+ +)]+ +