Circuit QED and Sudden Phase Switching in a Superconducting Qubit Array

L. Tian
Phys. Rev. Lett. 105, 167001 – Published 11 October 2010

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.

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  • Received 8 March 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.167001

© 2010 The American Physical Society

Authors & Affiliations

L. Tian*

  • University of California, Merced, 5200 North Lake Road, Merced, California 95343, USA

  • *ltian@ucmerced.edu

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Vol. 105, Iss. 16 — 15 October 2010

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