Vacuum-induced symmetry breaking in a superconducting quantum circuit
Vacuum-induced symmetry breaking in a superconducting quantum circuit
The ultrastrong-coupling regime, where the atom-cavity coupling rate reaches a considerable fraction of the cavity or atom transition frequencies, has been reported in a flux qubit superconducting quantum circuit coupled to an on-chip coplanar resonator. This regime enables the possibility of manipulating the cavity quantum electrodynamic ground state with controllable …