Physics – Quantum Physics
Scientific paper
2011-01-22
Phys. Rev. A 83, 042313 (2011)
Physics
Quantum Physics
6 pages, 5 figures
Scientific paper
10.1103/PhysRevA.83.042313
In solid-state circuit QED system, we extend the previous study of generating and stabilizing two-qubit Bell state [Phys. Rev. A 82, 032335 (2010)], to three-qubit GHZ state. In dispersive regime, we employ the homodyne joint readout for multiple qubits to infer the state for further processing, and in particular use it to stabilize the state directly by means of an alternate-flip-interrupted Zeno (AFIZ) scheme. Moreover, the state-of-the-art feedback action based on the filtered current enables not only a deterministic generation of the pre-GHZ state in the initial stage, but also a fast recovery from the environment-caused degradation in the later stabilization process. We show that the proposed scheme can maintain the state with high fidelity if the efficient quantum measurement and rapid single-qubit rotations are available.
Ding Xinmei
Feng Wei
Li Xin-Qi
Wang Peiyue
Xu Luting
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