Incomplete pure dephasing of N-qubit entangled W states

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dc.creatorDoll, Roland
dc.creatorWubs, Martijn
dc.creatorHanggi, Peter
dc.creatorKohler, Sigmund
dc.date2007-03-02
dc.date2007-06-21
dc.date.accessioned2026-07-07T08:19:06Z
dc.date.available2026-07-07T08:19:06Z
dc.descriptionWe consider qubits in a linear arrangement coupled to a bosonic field which acts as a quantum heat bath and causes decoherence. By taking the spatial separation of the qubits explicitly into account, the reduced qubit dynamics acquires an additional non-Markovian element. We investigate the time evolution of an entangled many-qubit W state, which for vanishing qubit separation remains robust under pure dephasing. For finite separation, by contrast, the dynamics is no longer decoherence-free. On the other hand, spatial noise correlations may prevent a complete dephasing. While a standard Bloch-Redfield master equation fails to describe this behavior even qualitatively, we propose instead a widely applicable causal master equation. Here we employ it to identify and characterize decoherence-poor subspaces. Consequences for quantum error correction are discussed.
dc.description14 pages, 6 figures, revised version, to appear in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0703075
dc.identifierhttp://arxiv.org/abs/cond-mat/0703075
dc.identifierPhys. Rev. B 76, 045317 (2007)
dc.identifierdoi:10.1103/PhysRevB.76.045317
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/134657
dc.subjectMesoscale and Nanoscale Physics
dc.subjectQuantum Physics
dc.titleIncomplete pure dephasing of N-qubit entangled W states
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