Nonlocal magnon entanglement generation in coupled hybrid cavity systems

TL;DR

This paper explores how to generate and optimize nonlocal entanglement between remote magnon-superconducting hybrid systems using fiber-coupled microwave cavities, revealing an optimal coupling strength for fastest entanglement creation.

Contribution

It introduces a theoretical model for entanglement generation in hybrid magnon-circuit systems and identifies optimal coupling conditions within current technological capabilities.

Findings

Optimal fiber coupling strength minimizes entanglement generation time

Entanglement remains robust against environmental noise

System parameters are feasible with current technology

Abstract

We investigate dynamical generation of macroscopic nonlocal entanglements between two remote massive magnon-superconducting-circuit hybrid systems. Two fiber-coupled microwave cavities are employed to serve as an interaction channel connecting two sets of macroscopic hybrid units each containing a magnon (hosted by a Yttrium-Iron-Garnet sphere) and a superconducting-circuit qubit. Surprisingly, it is found that stronger coupling does not necessarily mean faster entanglement generation. The proposed hybrid system allows the existence of an optimal fiber coupling strength that requests the shortest amount of time to generate a systematic maximal entanglement. Our theoretical results are shown to be within the scope of specific parameters that can be achieved with current technology. The noise effects on the implementation of systems are also treated in a general environment suggesting the robustness of entanglement generation. Our discrete-variable qubit-like entanglement theory of magnons may lead to direct applications in various quantum information tasks.