Quantum Teleportation from Telecom Photons to Erbium-ion Ensembles

TL;DR

This paper demonstrates quantum teleportation from telecom-wavelength photons to erbium-ion quantum memories, using chip-scale resonators and confirming high-fidelity transfer, advancing scalable quantum network development.

Contribution

It presents the first successful teleportation from telecom photons to erbium-ion quantum memories with high fidelity, compatible with existing fiber networks.

Findings

Quantum teleportation achieved with high fidelity

Use of chip-scale silicon nitride micro-resonators

Compatibility with fiber-optic quantum networks

Abstract

To realize a quantum internet, the distribution of quantum states via quantum teleportation with quantum memories is a key ingredient. Being compatible with existing fiber networks, entangled photons and quantum memories at telecom-wavelength are of central interest for such a scalable quantum network. Here, we demonstrate quantum teleportation from a telecom-wavelength photonic qubit to a solid-state quantum memory based on erbium-ion ensembles, which have a native optical transition at 1.5 $\mu$m telecom C-band. To accomplish this, we use chip-scale silicon nitride micro-resonators to generate entangled photons with narrow linewidth, compatible with the quantum memory. We confirm the quality of the quantum teleportation procedure using quantum state and process tomography techniques, in which both the quantum state and process fidelities exceeds the classical limit. These results pave the way for the realization of scalable quantum networks based on solid-state devices.