Teleportation Systems Towards a Quantum Internet

TL;DR

This paper demonstrates high-fidelity quantum teleportation of time-bin qubits over long distances using fiber optics and state-of-the-art detectors, advancing the development of practical quantum internet infrastructure.

Contribution

It presents a fiber-based quantum teleportation system achieving over 90% fidelity at telecommunication wavelengths, compatible with existing quantum networks and solid-state devices.

Findings

Teleportation fidelity >=90%

Successful teleportation over 44 km of fiber

Compatibility with solid-state quantum devices

Abstract

Quantum teleportation is essential for many quantum information technologies including long-distance quantum networks. Using fiber-coupled devices, including state-of-the-art low-noise superconducting nanowire single photon detectors and off-the-shelf optics, we achieve quantum teleportation of time-bin qubits at the telecommunication wavelength of 1536.5 nm. We measure teleportation fidelities of >=90% that are consistent with an analytical model of our system, which includes realistic imperfections. To demonstrate the compatibility of our setup with deployed quantum networks, we teleport qubits over 22 km of single-mode fiber while transmitting qubits over an additional 22 km of fiber. Our systems, which are compatible with emerging solid-state quantum devices, provide a realistic foundation for a high-fidelity quantum internet with practical devices.