Multi-qubit entanglement in bi-directional chiral waveguide QED

TL;DR

This paper investigates how a single-photon Gaussian wavepacket can generate and enhance entanglement among multiple atoms in bi-directional chiral waveguide QED, with implications for quantum networks.

Contribution

It demonstrates that entanglement survival and maximum levels can be significantly increased by optimizing decay rates and waveguide chirality, regardless of atom number.

Findings

Entanglement survival times can be increased by at least 50%.

Maximum entanglement levels are improved by a factor of 1.5.

Robustness of entanglement is affected by detuning and delays.

Abstract

We study the generation of entanglement induced by a single-photon Gaussian wavepacket in multi-atom bi-directional waveguide QED. In particular, we investigate the effect of increasing the number of atoms on the average pairwise entanglement. We demonstrate by selecting smaller decay rates and in chiral waveguide settings, that both entanglement survival times and maximum generated entanglement can be increased by at least a factor of 3/2, independent of the number of atoms. In addition, we analyze the influence of detuning and delays on the robustness of the generated entanglement. There are potential applications of our results in entanglement based multi-qubit quantum networks