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) |
|---|---|
| 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
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Cite this
Lidar, D. A., Bacon, D., Kempe, J., & Whaley, K. B. (2000). Protecting quantum information encoded in decoherence-free states against exchange errors. Physical Review A - Atomic, Molecular, and Optical Physics, 61(5), 523071-523075. [052307]. https://doi.org/10.1103/physreva.61.052307