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Entanglement swapping in presence of dephasing
Author(s) -
Dajka J.,
Łuczka J.,
Hänggi P.
Publication year - 2009
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200881551
Subject(s) - quantum entanglement , dephasing , qubit , quantum mechanics , physics , squashed entanglement , w state , statistical physics , quantum
Entanglement which originates from a pair of non‐interacting qubits by means of entanglement swapping is discussed when dephasing mechanisms are present. Then, the exact reduced dynamics can be evaluated for two pairs of independent qubits which each are coupled to their own bosonic environment. Each of two pairs of qubits is initially maximally entangled. The conditions for the entanglement survival at asymptotic long times in terms of environment spectral properties are elaborated. It is shown that these conditions hold true also for the inter–pair entanglement stemming. Entanglement swapping can effectively been controlled by a proper choice of initial state of the finite environment (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)