We propose methods for the preparation and entanglement detection of multi-qubit GHZ states in circuit quantum electrodynamics. Using quantum trajectory simulations appropriate for the situation of a weak continuous measurement, we show that the joint dispersive readout of several qubits can be utilized for the probabilistic production of high-fidelity GHZ states. When employing a nonlinear filter on the recorded homodyne signal, the selected states are found to exhibit values of the Bell-Mermin operator exceeding 2 under realistic conditions. We discuss the potential of the dispersive readout to demonstrate a violation of the Mermin bound, and present a measurement scheme avoiding the necessity for full detector tomography.
@article{arxiv.0902.0324,
title = {Proposal for generating and detecting multi-qubit GHZ states in circuit QED},
author = {Lev S. Bishop and L. Tornberg and D. Price and E. Ginossar and A. Nunnenkamp and A. A. Houck and J. M. Gambetta and Jens Koch and G. Johansson and S. M. Girvin and R. J. Schoelkopf},
journal= {arXiv preprint arXiv:0902.0324},
year = {2009}
}