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Title: Continuous quantum error correction through local operations
Authors: Mascarenhas, E.
Marques, B.
Cunha, M.T.
Santos, M.F. 
Issue Date: 28-Sep-2010
Citation: Mascarenhas, E., Marques, B., Cunha, M.T., Santos, M.F. (2010-09-28). Continuous quantum error correction through local operations. Physical Review A - Atomic, Molecular, and Optical Physics 82 (3) : -. ScholarBank@NUS Repository.
Abstract: We propose local strategies to protect global quantum information. The protocols, which are quantum error-correcting codes for dissipative systems, are based on environment measurements, direct feedback control, and simple encoding of the logical qubits into physical qutrits whose decaying transitions are indistinguishable and equally probable. The simple addition of one extra level in the description of the subsystems allows for local actions to fully and deterministically protect global resources such as entanglement. We present codes for both quantum jump and quantum state diffusion measurement strategies and test them against several sources of inefficiency. The use of qutrits in information protocols suggests further characterization of qutrit-qutrit disentanglement dynamics, which we also give together with simple local environment measurement schemes able to prevent distillability sudden death and even enhance entanglement in situations in which our feedback error correction is not possible. © 2010 The American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.82.032327
Appears in Collections:Staff Publications

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