Protecting Quantum Information Encoded in Decoherence Free States Against Exchange Errors

Details Protecting Quantum Information Encoded in Decoherence Free States Against Exchange Errors Protecting Quantum Information Encoded in Decoherence Free States Against Exchange Errors

1999-07-29

arxiv.org/abs/quant-ph/9907096v3

Phys. Rev. A Vol. 61(5), p. 52307 (2000)

Physics

Quantum Physics

7 pages, no figures. Discussion in section V.A. significantly expanded. Several small changes. Two authors added

Scientific paper

10.1103/PhysRevA.61.052307

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. {\bf 82}, 4556 (1999)].

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