Universal optimal broadband photon cloning and entanglement creation in one dimensional atoms

TL;DR

This paper demonstrates a three-level atom in a waveguide can function as a universal photon cloning machine or an entangled photon pair source, adaptable across frequencies with current solid-state tech.

Contribution

It introduces a versatile quantum device capable of optimal photon cloning and entanglement generation using a single atom-waveguide system.

Findings

Achieves near-optimal universal photon cloning.

Efficient deterministic entangled photon pair production.

Operates over a broad frequency range.

Abstract

We study an initially inverted three-level atom in the lambda configuration embedded in a waveguide, interacting with a propagating single-photon pulse. Depending on the temporal shape of the pulse, the system behaves either as an optimal universal cloning machine, or as a highly efficient deterministic source of maximally entangled photon pairs. This quantum transistor operates over a wide range of frequencies, and can be implemented with today's solid-state technologies.