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We introduce three tunable parameters to optimize the fidelity of quantumteleportation with continuous-variable in nonideal scheme. Using thecharacteristic function formalism, we present the condition that theteleportation fidelity is independent of the amplitude of input coherent statesfor any entangled resource. Then we investigate the effects of tunableparameters on the fidelity with or without the presence of environment andimperfect measurements, by analytically deriving the expression of fidelity forthree different input coherent state distributions. It is shown that, for thelinear distribution, the optimization with three tunable parameters is the bestone with respect to single- and two-parameter optimization. Our results revealthe usefulness of tunable parameters for improving the fidelity ofteleportation and the ability against the decoherence.

Optimal fidelity of teleportation with continuous-variable using three-tunable parameters in realistic environment