Proposal for generating and detecting multi-qubit GHZ states in circuit QED
Artikel i vetenskaplig tidskrift, 2009

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.


Lev S. Bishop

Yale University

Lars Tornberg

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

D. Price

Yale University

E. Ginossar

Yale University

A. Nunnenkamp

Yale University

A. A. Houck

Princeton University

J.M. Gambetta

University of Waterloo

Jens Koch

Yale University

Göran Johansson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

S.M. Girvin

Yale University

RJ Schoelkopf

Yale University

New Journal of Physics

1367-2630 (ISSN)

Vol. 11 073040-


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