Parity-preserving light-matter system mediates effective two-body   interactions
  We study the equilibrium and non-equilibrium physics of two qubits interacting through an ultrastrong coupled qubit-cavity system. By tuning the qubits energy gap while keeping the ultrastrong coupling system to its ground state, we demonstrate a strong two-qubit interaction as well as an enhanced excitation transfer between the two qubits. Our proposal has twofold implications: a means to attain multipurpose parity-protected quantum information tasks in superconducting circuits, and a building block for ultrastrong coupled cavity-enhanced exciton transport in disordered media. 
Thi Ha Kyaw, Sebastian Allende, Leong-Chuan Kwek, Guillermo Romero
quant-ph cond-mat.mes-hall cond-mat.supr-con