Unitary transfer of entanglement in multipartite two-level systems

TL;DR

This paper presents an exact study of entanglement transfer in a four-atom system, demonstrating periodic transfer of entanglement between non-interacting pairs and discussing experimental observability.

Contribution

It provides an exact analysis of entanglement transfer dynamics in a multipartite two-level system, highlighting the conditions for observable and stable transfer.

Findings

Entanglement fully transfers between atom pairs periodically.

Transfer is observable within specific temporal scales.

System stability against parameter uncertainties is discussed.

Abstract

The dynamics of a system composed by two pairs of dipolarly coupled two-level atoms is exactly studied. We show that the initial entanglement stored in a couple of atoms not directly interacting is fully transferred to the other pair in a periodic way. The observability of this phenomenon in laboratory is briefly discussed both in terms of its temporal scale and of its stability against uncertainties in the geometrical parameters defining the physical system.