Continuous variable quantum teleportation with noiseless linear amplifier

Continuous variable quantum teleportation (CVQT) plays an important role in practical quantum communication. However, the noise and loss in the actual environment will lead to the degradation ofentanglement, which has an effect on the performance of the system in terms of the transmission distance andhence hinders its implementations. In this paper, we suggest an approach to improving the performance of theCVQT system with an embedded noiseless linear amplifier (NLA). By using the NLA, one can amplify thedegenerated entangled source to compensate for the attenuation of the fiber. Then we consider the influences ofthe available gains of the NLA on the performance of the proposed scheme under different lossy channels andentangled sources. The simulation results show that the performance is improved in fidelity and transmissiondistance, which may provide a feasible and effective method of putting the long-distance CVQT into practical application