Generation and optimization of entanglement between atoms chirally coupled to spin cavities

TL;DR

This paper investigates how to efficiently generate and optimize entanglement between atoms coupled to spin cavities, revealing effects of parity, chirality, and disorder on entanglement dynamics and speed.

Contribution

It introduces a detailed analysis of entanglement generation in chiral spin cavities, highlighting the impact of parity, driving fields, and disorder on entanglement speed and quality.

Findings

Chiral coupling accelerates entanglement generation by ~50%.

Resonant dips in concurrence occur at specific driving strengths.

Disorder can be controlled to enhance and speed up entanglement creation.

Abstract

We explore the generation and optimization of entanglement between atoms chirally coupled to finite 1D spin chains, functioning as {\it spin cavities}. By diagonalizing the spin cavity Hamiltonian, we identify a parity effect that influences entanglement, with small even-sized cavities chirally coupled to atoms expediting entanglement generation by approximately $50\%$ faster than non-chiral coupling. Applying a classical driving field to the atoms reveals oscillations in concurrence, with resonant dips at specific driving strengths due to the resonances between the driven atom and the spin cavity. Extending our study to systems with energetic disorder, we find that high concurrence can be achieved regardless of disorder strength when the inverse participation ratio of the resulting eigenstates is favorable. Finally, we demonstrate that controlled disorder within the cavity significantly enhances and expedites entanglement generation, achieving higher concurrences up to four times faster than those attained in ordered systems.