Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevA.75.052312
Title: Scheme for unconventional geometric quantum computation in cavity QED
Authors: Feng, X.-L. 
Wang, Z. 
Wu, C. 
Kwek, L.C. 
Lai, C.H. 
Oh, C.H. 
Issue Date: 9-May-2007
Citation: Feng, X.-L., Wang, Z., Wu, C., Kwek, L.C., Lai, C.H., Oh, C.H. (2007-05-09). Scheme for unconventional geometric quantum computation in cavity QED. Physical Review A - Atomic, Molecular, and Optical Physics 75 (5) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.75.052312
Abstract: In this paper, we present a scheme for implementing the unconventional geometric two-qubit phase gate with nonzero dynamical phase based on two-channel Raman interaction of two atoms in a cavity. We show that the dynamical phase and the total phase for a cyclic evolution are proportional to the geometric phase in the same cyclic evolution; hence they possess the same geometric features as does the geometric phase. In our scheme, the atomic excited state is adiabatically eliminated, and the operation of the proposed logic gate involves only the metastable states of the atoms; thus the effect of the atomic spontaneous emission can be neglected. The influence of the cavity decay on our scheme is examined. It is found that the relations regarding the dynamical phase, the total phase, and the geometric phase in the ideal situation are still valid in the case of weak cavity decay. Feasibility and the effect of the phase fluctuations of the driving laser fields are also discussed. © 2007 The American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/97867
ISSN: 10502947
DOI: 10.1103/PhysRevA.75.052312
Appears in Collections:Staff Publications

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