title: Circuit QED and sudden phase switching in a superconducting qubit array.
abstract: Superconducting qubits connected in an array can form quantum many-body systems such as the quantum Ising model. By coupling the qubits to a superconducting resonator, the combined system forms a circuit QED system. Here, we study the nonlinear behavior in the many-body state of the qubit array using a semiclassical approach. We show that sudden switchings as well as a bistable regime between the ferromagnetic phase and the paramagnetic phase can be observed in the qubit array. A superconducting circuit to implement this system is presented with realistic parameters.
authors.affiliation: University of California, Merced, 5200 North Lake Road, Merced, California 95343, USA. ltian@ucmerced.edu
authors.forename: L
authors.initials: L
authors.lastname: Tian