Circuit QED and sudden phase switching in a superconducting qubit array

Details Circuit QED and sudden phase switching in a superconducting qubit array Circuit QED and sudden phase switching in a superconducting qubit array

2010-03-10

arxiv.org/abs/1003.2006v1

Phys. Rev. Lett. 105, 167001 (2010)

Physics

Quantum Physics

4 pages, 3 figures, submitted for publication.

Scientific paper

10.1103/PhysRevLett.105.167001

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 .

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