Hybrid quantum magnetism in circuit QED: from spin-photon waves to many-body spectroscopy.

@article{Kurcz2014HybridQM,
  title={Hybrid quantum magnetism in circuit QED: from spin-photon waves to many-body spectroscopy.},
  author={Andreas Kurcz and Alejandro Bermudez and Juan J. Garc{\'i}a-Ripoll},
  journal={Physical review letters},
  year={2014},
  volume={112 18},
  pages={180405}
}
We introduce a model of quantum magnetism induced by the nonperturbative exchange of microwave photons between distant superconducting qubits. By interconnecting qubits and cavities, we obtain a spin-boson lattice model that exhibits a quantum phase transition where both qubits and cavities spontaneously polarize. We present a many-body ansatz that captures this phenomenon all the way, from a the perturbative dispersive regime where photons can be traced out, to the nonperturbative ultrastrong… CONTINUE READING