Generation of unconventional geometric phase gates in ion trap-optical cavity system by squeezed operators
Zhang Ying-Qiao(张英俏)a)b)†, Jin Xing-Ri(金星日)b), and Zhang Shou(张寿)a)b)‡
a Center for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China; b Department of Physics, College of Science, Yanbian University, Yanji 133002, China
Abstract Based on squeezed operators this paper has implemented an ideal unconventional geometric quantum gate (GQG) in ion trap-optical cavity system by radiating the trapped ions with the cavity field of frequency $\omega_{\rm c}$ and an external laser field of frequency $\omega_{\rm L}$. It can ensure that the gate time is shorter than the coherence time for qubits and the decay time of the optical cavity by appropriately tuning the ionic transition frequency $\omega_{0}$, the frequencies of the cavity mode $\omega_{\rm c}$ and the vibrational mode $\nu$. It has also realized the unconventional GQG under the influence of the cavity decay based on the squeezed-like operators and found that the present scheme works well for the smaller cavity decay by investigating the corresponding fidelity and success probability.
Received: 11 April 2007
Revised: 03 July 2007
Accepted manuscript online:
PACS:
03.67.Lx
(Quantum computation architectures and implementations)
Fund: Project supported by the National
Natural Science Foundation of
China (Grant No 60667001) and the Science Foundation of Yanbian University
in China (Grant No 2007-31).
Cite this article:
Zhang Ying-Qiao(张英俏), Jin Xing-Ri(金星日), and Zhang Shou(张寿) Generation of unconventional geometric phase gates in ion trap-optical cavity system by squeezed operators 2008 Chin. Phys. B 17 424
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