Chin. Phys. Lett.  2011, Vol. 28 Issue (5): 050301    DOI: 10.1088/0256-307X/28/5/050301
Eliminating Next-Nearest-Neighbor Interactions in the Preparation of Cluster State
ZHANG Ji-Ying, ZHOU Zheng-Wei**, GUO Guang-Can
Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026
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ZHANG Ji-Ying, ZHOU Zheng-Wei, GUO Guang-Can 2011 Chin. Phys. Lett. 28 050301
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Abstract By analyzing recent schemes for preparing the chain cluster state, we find that the existence of long-range couplings between qubits will induce a quick decay of the fidelity of the cluster state. We propose some schemes for eliminating the effect of the next-nearest-neighbor interactions in the XY and Ising models by dynamical decoupling method. In our approach, the undesired next-nearest-neighbor interactions are effectively suppressed and the fidelity of the generated cluster state is greatly improved by the pulse operations.
Keywords: 03.67.Pp      03.67.Lx      03.67.-a     
Received: 22 November 2010      Published: 26 April 2011
PACS:  03.67.Pp (Quantum error correction and other methods for protection against decoherence)  
  03.67.Lx (Quantum computation architectures and implementations)  
  03.67.-a (Quantum information)  
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ZHOU Zheng-Wei
GUO Guang-Can
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