Quantum teleportation with independent sources over an optical fibre network

TL;DR

This study demonstrates quantum teleportation over 30 km of optical fiber using independently prepared sources, achieving high fidelity that surpasses classical limits, and advancing the development of quantum internet.

Contribution

First demonstration of quantum teleportation with independent sources over a long optical fiber network, with active feed-forward and fidelity surpassing classical bounds.

Findings

Quantum teleportation achieved over 30 km fiber

Fidelity exceeds classical limits (0.85 and 0.77)

Statistical test confirms quantum nature

Abstract

Quantum teleportation faithfully transfers a quantum state between distant nodes in a network, enabling revolutionary information processing applications. Here we report teleporting quantum states over a 30 km optical fiber network with the input single photon state and the EPR state prepared independently. By buffering photons in 10 km coiled optical fiber, we perform Bell state measurement after entanglement distribution. With active feed-forward operation, the average quantum state fidelity and quantum process fidelity are measured to be 0.85 and 0.77, exceeding classical limits of 0.67 and 0.5, respectively. The statistical hypothesis test shows that the probability of a classical process to predict an average state fidelity no less than the one observed in our experiment is less than 2.4E-14, confirming the quantum nature of our quantum teleportation experiment. Our experiment marks a critical step towards the realization of quantum internet in the future.