Sequential Quantum Teleportation of Optical Coherent States

TL;DR

This paper reports the successful implementation of sequential quantum teleportation of optical coherent states, demonstrating fidelities surpassing classical limits and approaching the performance of initial quantum teleportation experiments.

Contribution

It presents the first experimental realization of sequential quantum teleportation of optical coherent states with high fidelity.

Findings

Sequential teleportation fidelities exceed classical limits.

Fidelity between input and sequentially teleported states is 0.57.

Approaches the fidelity of initial quantum teleportation experiments.

Abstract

We demonstrate a sequence of two quantum teleportations of optical coherent states, combining two high-fidelity teleporters for continuous variables. In our experiment, the individual teleportation fidelities are evaluated as F_1 = 0.70 \pm 0.02 and F_2 = 0.75 \pm 0.02, while the fidelity between the input and the sequentially teleported states is determined as F^{(2)} = 0.57 \pm 0.02. This still exceeds the optimal fidelity of one half for classical teleportation of arbitrary coherent states and almost attains the value of the first (unsequential) quantum teleportation experiment with optical coherent states.