Proposal for generating and detecting multi-qubit GHZ states in circuit QED

Lev S. Bishop, L. Tornberg, David J. Price, Eran Ginossar, Andreas Nunnenkamp, Andrew Houck, Jay Gambetta, Jens Koch, Göran Johansson, S. M. Girvin

Abstract

We propose methods for the preparation and entanglement detection of multi-qubit Greenberger–Horne–Zeilinger (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.

Locations

• New Journal of Physics - View - PDF
• arXiv (Cornell University) - View - PDF
• Surrey Open Research repository (University of Surrey) - View - PDF
• DataCite API - View