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Two-qubit decoherence mechanisms revealed via quantum process tomography

Source: Phys. Rev. A 80, 042103 (2009); doi:10.1103/PhysRevA.80.042103

Published 5 October 2009

KEYWORDS and PACS
Keywords
PACS
  • 03.65.Wj
    State reconstruction, quantum tomography
  • 03.65.Yz
    Decoherence; open systems; quantum statistical methods
  • 85.25.Cp
    Josephson devices
  • YEAR: 2009
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PUBLICATION DATA
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A. G. Kofman and A. N. Korotkov
Department of Electrical Engineering, University of California, Riverside, California 92521, USA
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 sqrt(iSWAP) gate realized with superconducting phase qubits and calculate the QPT matrix chi 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 chi matrix. ©2009 The American Physical Society
History: Received 30 March 2009; published 5 October 2009
Permalink: http://link.aps.org/abstract/PRA/v80/e042103

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