Quantum computation in the decoherence-free subspaces with cavity QED
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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.
KeywordsCavity Mode Phase Gate Cavity Decay Logical Qubit Physical Qubits
This work is supported by the NSFC under Grant No. 11074079, the Ph.D. Programs Foundation of Ministry of Education of China, and National Research Foundation and Ministry of Education, Singapore, under research Grant No. WBS: R-710-000-008-271.
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