Sharing quantum nonlocality and teleportation over long distance using optical hybrid states

TL;DR

This paper demonstrates that optical hybrid states can effectively share nonlocal correlations and enable high-fidelity quantum teleportation over long distances, even with realistic device imperfections.

Contribution

It introduces a method using entanglement swapping with optical hybrid states to achieve long-distance Bell nonlocality and quantum teleportation.

Findings

Bell inequality violation over metropolitan distances

High-quality quantum teleportation with realistic device parameters

Effective sharing of nonlocal correlations using hybrid states

Abstract

We analyze sharing Bell-type nonlocal correlation between two distant parties with optical hybrid states comprising a single photon polarization state and a multiphoton coherent state. By deploying entanglement swapping over the coherent state parts at the middle station, we show that the optical hybrid states can efficiently generate a polarization-entangled state that violates Clauser-Horne-Shimony-Holt (CHSH) Bell-inequality well over a metropolitan distance. We further assess the quality of the shared entangled state in the information processing task of quantum teleportation of an unknown polarization qubit. Our results with realistic devices, embedding detection inefficiency and transmission losses, indicate the viability of faithful quantum teleportation over large distances, consistent with the quality of the shared correlation.