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

Lev S. Bishop ; Lars Tornberg (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; D. Price ; E. Ginossar ; A. Nunnenkamp ; A. A. Houck ; J.M. Gambetta ; Jens Koch ; Göran Johansson (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; S.M. Girvin ; R. J. Schoelkopf
New Journal of Physics (1367-2630). Vol. 11 (2009), p. 073040.
[Artikel, refereegranskad vetenskaplig]

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.

Article Number: 073040

Denna post skapades 2009-04-30. Senast ändrad 2014-09-02.
CPL Pubid: 93322


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik


Mesoskopisk fysik

Chalmers infrastruktur

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