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.
Original language | English (US) |
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Article number | 073040 |
Journal | New Journal of Physics |
Volume | 11 |
DOIs | |
State | Published - Jul 23 2009 |
ASJC Scopus subject areas
- General Physics and Astronomy