TY - JOUR
T1 - Protecting quantum information encoded in decoherence-free states against exchange errors
AU - Lidar, Daniel A.
AU - Bacon, David
AU - Kempe, Julia
AU - Whaley, K. Birgitta
PY - 2000/5
Y1 - 2000/5
N2 - The exchange interaction between identical qubits in a quantum-information processor gives rise to unitary two-qubit errors. It is shown here that decoherence-free subspaces (DFSs) for collective decoherence undergo Pauli errors under exchange, which, however, do not take the decoherence-free states outside of the DFS. In order to protect DFSs against these errors it is sufficient to employ a recently proposed concatenated DFS quantum-error-correcting code scheme [D. A. Lidar, D. Bacon, and K.B. Whaley, Phys. Rev. Lett. 82, 4556 (1999)].
AB - The exchange interaction between identical qubits in a quantum-information processor gives rise to unitary two-qubit errors. It is shown here that decoherence-free subspaces (DFSs) for collective decoherence undergo Pauli errors under exchange, which, however, do not take the decoherence-free states outside of the DFS. In order to protect DFSs against these errors it is sufficient to employ a recently proposed concatenated DFS quantum-error-correcting code scheme [D. A. Lidar, D. Bacon, and K.B. Whaley, Phys. Rev. Lett. 82, 4556 (1999)].
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U2 - 10.1103/physreva.61.052307
DO - 10.1103/physreva.61.052307
M3 - Article
AN - SCOPUS:0347741640
SN - 1050-2947
VL - 61
SP - 523071
EP - 523075
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 5
M1 - 052307
ER -