Nonideal teleportation in coherent-state basis

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Abstract
A coherent representation has been developed for entanglement and measurement, which is an elegant approach to continuous variable quantum teleportation. In the present paper this frame is used to deal with nonideal elements of the experimental situation, such as inefficiencies of the Bell measurement, loss, and thermal noise in the nonlinear crystal used for producing entangled pairs. A measure of fidelity is introduced for characterizing the quality of nonideal schemes.