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

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

2009-02-02

arxiv.org/abs/0902.0324v1

New J. Phys. 11 (2009) 073040

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figures

Scientific paper

10.1088/1367-2630/11/7/073040

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.

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