Entangling two giant atoms via a topological waveguide

TL;DR

This paper investigates how two giant atoms become entangled via a topological SSH waveguide, analyzing various coupling configurations and their effects on entanglement dynamics, with implications for quantum control in topological quantum systems.

Contribution

It introduces a detailed analysis of entanglement generation between giant atoms coupled to a topological waveguide, considering multiple configurations and the influence of the waveguide's topological properties.

Findings

Entanglement depends on coupling configuration and distance.

14 configurations show entanglement dynamics influenced by the SSH dimerization.

Delayed entanglement birth is enhanced in specific configuration pairs.

Abstract

The entanglement generation of two two-level giant atoms coupled to a photonic waveguide, which is formed by a Su-Schrieffer-Heeger (SSH) type coupled-cavity array is studied. Here, each atom is coupled to the waveguide through two coupling points. The two-atom separate-coupling case is studied, and 16 coupling configurations are considered for the coupling-point distributions between the two atoms and the waveguide. Quantum master equations are derived to govern the evolution of the two atoms and characterize atomic entanglement by calculating the concurrence of the two-atom states. It is found that the two giant-atom entanglement depends on the coupling configurations and the coupling-point distance of the giant atoms. In particular, the entanglement dynamics of the two giant atoms in 14 coupling configurations depend on the dimerization parameter of the SSH waveguide. According to the self-energies of the two giant atoms, it is found that ten of these 16 coupling configurations can be divided into five pairs. It is also showed that the delayed sudden birth of entanglement between the two giant atoms is largely enhanced in these five pairs of coupling configurations. This work will promote the study of quantum effects and coherent manipulation in giant-atom topological-waveguide-QED systems.