Abstract
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)].
Original language | English (US) |
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Article number | 052307 |
Pages (from-to) | 523071-523075 |
Number of pages | 5 |
Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
Volume | 61 |
Issue number | 5 |
DOIs | |
State | Published - May 2000 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics