Quantum Teleportation with Imperfect Quantum Dots

TL;DR

This paper demonstrates that even imperfect quantum dots can achieve high-fidelity quantum teleportation, relaxing the stringent requirements for ideal photon sources in quantum communication.

Contribution

It introduces protocols that improve teleportation fidelity using sub-optimal quantum dot sources, supported by a theoretical model explaining the experimental results.

Findings

Teleportation fidelity improved from below classical limit to 0.842(14).

Imperfect quantum dots can still be effective in quantum teleportation.

Theoretical model matches experimental data.

Abstract

Efficient all-photonic quantum teleportation requires fast and deterministic sources of highly indistinguishable and entangled photons. Solid-state-based quantum emitters--notably semiconductor quantum dots--are a promising candidate for the role. However, despite the remarkable progress in nanofabrication, proof-of-concept demonstrations of quantum teleportation have highlighted that imperfections of the emitter still place a major roadblock in the way of applications. Here, rather than focusing on source optimization strategies, we deal with imperfections and study different teleportation protocols with the goal of identifying the one with maximal teleportation fidelity. Using a quantum dot with sub-par values of entanglement and photon indistinguishability, we show that the average teleportation fidelity can be raised from below the classical limit to 0.842(14). Our results, which are backed by a theoretical model that quantitatively explains the experimental findings, loosen the very stringent requirements set on the ideal entangled-photon source and highlight that imperfect quantum dots can still have a say in teleportation-based quantum communication architectures.