Nonlocal magnon entanglement generation in coupled hybrid cavity systems

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 sets units, each containing a magnon (hosted by yttrium–iron–garnet sphere) and superconducting-circuit qubit. Surprisingly, it is found that stronger coupling does not necessarily mean faster entanglement generation. The proposed system allows the existence optimal fiber strength requires shortest amount time generate systematic maximal entanglement. Our theoretical results shown be within scope specific parameters can achieved with current technology. noise effects on implementation systems also treated in general environment, suggesting robustness discrete-variable qubit-like theory magnons may lead direct applications various quantum information tasks.