Quantum computation in the decoherence-free subspaces with cavity QED

  • Authors:

  • Yue-Yue Chen;Xun-Li Feng;C. H. Oh

  • Affiliations:

  • State Key Laboratory for High-Field Laser Physics, Shanghai Institute of Optical and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China 201800 and Laboratory of Photonic Information Tech ...;State Key Laboratory for High-Field Laser Physics, Shanghai Institute of Optical and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China 201800 and Department of Physics and Centre for Qu ...;Department of Physics and Centre for Quantum Technologies, National University of Singapore, Singapore, Singapore 117542

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2014

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Abstract

We present a scheme to implement quantum computation in decoherence-free subspaces (DFSs) with four atoms in a single-mode cavity. A four-dimensional DFS is constituted to protect quantum information when the full symmetry of interaction between system and environment is broken in a specific way, and entangling two-qubit logic gates and noncommuting single-qubit gates are implemented in such DFS. The gate fidelity is numerically calculated, and the feasibility of the approximations taken in this work is verified based on the numerical calculations.