Faithful quantum teleportation via a nanophotonic nonlinear Bell state analyzer
Abstract
Quantum networking protocols, including quantum teleportation and entanglement swapping, use linear-optical Bell state measurements for heralding the distribution and transfer of quantum information. However, a linear-optical Bell state measurement requires identical photons and is susceptible to errors caused by multiphoton emission, fundamentally limiting the efficiency and fidelity of quantum networking protocols. Here we show a nonlinear Bell state analyzer for time-bin encoded photons based on a nanophotonic cavity with efficient sum-frequency generation to filter multiphoton emissions, and utilize it for faithful quantum teleportation involving spectrally distinct photons with fidelities down to the single-photon level. Our result demonstrates that nonlinear-optical entangling operations, empowered by our efficient nanophotonics platform, can realize faithful quantum information protocols without requiring identical photons and without the fundamental limit on the efficiency and fidelity of a Bell state measurement imposed by linear optics, which facilitates the realization of practical quantum networks.
Keywords
Cite
@article{arxiv.2411.15437,
title = {Faithful quantum teleportation via a nanophotonic nonlinear Bell state analyzer},
author = {Joshua Akin and Yunlei Zhao and Paul G. Kwiat and Elizabeth A. Goldschmidt and Kejie Fang},
journal= {arXiv preprint arXiv:2411.15437},
year = {2025}
}