Phys. Rev. A 80, 042103 (2009) [15 pages]Two-qubit decoherence mechanisms revealed via quantum process tomographyReceived 30 March 2009; published 5 October 2009 We analyze the quantum process tomography (QPT) in the presence of decoherence, focusing on distinguishing local and nonlocal decoherence mechanisms for a two-partite system from experimental QPT data. In particular, we consider the √iSWAP gate realized with superconducting phase qubits and calculate the QPT matrix χ in the presence of several local and nonlocal decoherence processes. We determine specific patterns of these decoherence processes, which can be used for a fast identification of the main decoherence mechanisms from an experimental χ matrix. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.80.042103
DOI:
10.1103/PhysRevA.80.042103
PACS:
03.65.Wj, 03.65.Yz, 85.25.Cp
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