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

Lev S. Bishop, L. Tornberg, D. Price, E. Ginossar, A. Nunnenkamp, A. A. Houck, J. M. Gambetta, Jens Koch, G. Johansson, S. M. Girvin, R. J. Schoelkopf

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


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.

Original languageEnglish (US)
Article number073040
JournalNew Journal of Physics
StatePublished - Jul 23 2009

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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