Entanglement Transfer Between Giant Atoms in Waveguide‐QED Systems

Abstract The entanglement transfer is investigated between giant atoms in waveguide‐QED systems. The two giant atom pairs, and , are independently coupled to their respective waveguides. Initially, entanglement are stored in atom pair . There three giant atom configurations are considered: separated, braided, and nested. For comparison, the small atom configuration is also studied here. The focus is on entanglement transfer from atom pair to atom pair and atom pair in these four coupling configurations. It is shown that the transfer of entanglement in each configuration strongly depends on phase shift. In particular, the braided configuration demonstrates superior performance in entanglement transfer. For the entanglement transfer from atom pair to atom pair , complete entanglement transfer is presented in braided configuration, a behavior not found in small atom or other giant atom configurations. For the entanglement transfer from atom pair to atom pair , although the maximum entanglement transferred to atom pair in the braided configuration is half of that one to atom pair , it is still higher than that in the small atom, separated, and nested configurations. This study lays the foundation for entanglement transfer between giant atoms in waveguide‐QED platforms.