Realistic continuous-variable quantum teleportation with non-Gaussian resources

TL;DR

This paper investigates how non-Gaussian entangled resources improve the efficiency and robustness of continuous-variable quantum teleportation under realistic, nonideal conditions, including decoherence and measurement imperfections.

Contribution

It provides an analytical framework for optimizing non-Gaussian resources in realistic teleportation scenarios, demonstrating their advantages over Gaussian resources.

Findings

Non-Gaussian resources significantly enhance teleportation efficiency.

Non-Gaussian resources are more robust against decoherence.

Partial input information further improves teleportation performance.

Abstract

We present a comprehensive investigation of nonideal continuous-variable quantum teleportation implemented with entangled non-Gaussian resources. We discuss in a unified framework the main decoherence mechanisms, including imperfect Bell measurements and propagation of optical fields in lossy fibers, applying the formalism of the characteristic function. By exploiting appropriate displacement strategies, we compute analytically the success probability of teleportation for input coherent states, and two classes of non-Gaussian entangled resources: Two-mode squeezed Bell-like states (that include as particular cases photon-added and photon-subtracted de-Gaussified states), and two-mode squeezed cat-like states. We discuss the optimization procedure on the free parameters of the non-Gaussian resources at fixed values of the squeezing and of the experimental quantities determining the inefficiencies of the non-ideal protocol. It is found that non-Gaussian resources enhance significantly the efficiency of teleportation and are more robust against decoherence than the corresponding Gaussian ones. Partial information on the alphabet of input states allows further significant improvement in the performance of the non-ideal teleportation protocol.