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We show that the recently proposed scheme of teleportation of continuousvariables [S.L. Braunstein and H.J. Kimble, Phys. Rev. Lett. 80, 869 (1998)]can be improved by a conditional measurement in the preparation of theentangled state shared by the sender and the recipient. The conditionalmeasurement subtracts photons from the original entangled two-mode squeezedvacuum, by transmitting each mode through a low-reflectivity beam splitter andperforming a joint photon-number measurement on the reflected beams. In thisway the degree of entanglement of the shared state is increased and so is thefidelity of the teleported state.Comment: 7 pages REVTeX, 7 figure

Improvement on teleportation of continuous variables by photon subtraction via conditional measurement