Long-distance quantum communication with "polarization" maximally entangled states

TL;DR

This paper proposes a robust scheme for long-distance quantum communication using polarization-entangled atomic ensembles, leveraging two-photon and one-photon interference to improve speed and fidelity.

Contribution

It introduces a novel method combining two-photon interference and quantum swapping with atomic ensembles for efficient long-distance entanglement.

Findings

Robust against phase fluctuations in quantum channels

Speeds up high-fidelity entanglement generation

Utilizes on-demand single-photon sources for entanglement

Abstract

We propose a scheme for long-distance quantum communication where the elementary entanglement is generated through two-photon interference and quantum swapping is performed through one-photon interference. Local "polarization" maximally entangled states of atomic ensembles are generated by absorbing a single photon from on-demand single-photon sources. This scheme is robust against phase fluctuations in the quantum channels, moreover speeds up long-distance high-fidelity entanglement generation rate.