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Entangling two unequal atoms through a common bath

Source: Phys. Rev. A 81, 012105 (2010); doi:10.1103/PhysRevA.81.012105

Published 7 January 2010

PACS
  • 03.65.Yz
    Decoherence; open systems; quantum statistical methods
  • 03.67.Bg
    Entanglement production and manipulation (quantum information)
  • YEAR: 2010
PUBLICATION DATA
Publisher:
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F. Benatti,1,2 R. Floreanini,2 and U. Marzolino1,2
1Dipartimento di Fisica Teorica, Universit di Trieste, I-34014 Trieste, Italy
2Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34014 Trieste, Italy
The evolution of two, noninteracting, two-level atoms immersed in a weakly coupled bath can be described by a refined, time-coarse-grained Markovian evolution, still preserving complete positivity. We find that this improved, reduced dynamics is able to entangle the two atoms even when their internal frequencies are unequal, an effect that appears impossible in the standard weak-coupling-limit approach. We study in detail this phenomenon for an environment made of quantum fields. ©2010 The American Physical Society
History: Received 15 July 2009; published 7 January 2010
Permalink: http://link.aps.org/abstract/PRA/v81/e012105
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