Robust Distant Entanglement Generation Using Coherent Multiphoton Scattering

TL;DR

This paper presents a robust protocol for entangling distant qubits using resonance fluorescence and multiphoton scattering, achieving high success probability and fidelity despite photon fluctuations, suitable for current experimental setups.

Contribution

It introduces a new entanglement scheme leveraging multiphoton signals and postselection, enhancing robustness and efficiency over previous methods.

Findings

High success probability and fidelity achieved.

Robust against photon fluctuations across various driving fields.

Entanglement duration compatible with qubit decoherence times.

Abstract

We describe a protocol to entangle two qubits at a distance by using resonance fluorescence. The scheme makes use of the postselection of large and distinguishable fluorescence signals corresponding to entangled and unentangled qubit states and has the merits of both high success probability and high entanglement fidelity owing to the multiphoton nature. Our result shows that the entanglement generation is robust against photon fluctuations in the fluorescence signals for a wide range of driving fields. We also demonstrate that this new protocol has an average entanglement duration within the decoherence time of corresponding qubit systems, based on current experimental photon efficiency.