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Quantum discord and non-Markovianity of quantum dynamics

Alipour, S ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.85.052108
  3. Publisher: 2012
  4. Abstract:
  5. The problem of recognizing (non-)Markovianity of a quantum dynamics is revisited through analyzing quantum correlations. We argue that instantaneouslyvanishing quantum discord provides a necessary and sufficient condition for Markovianity of a quantum map. This is used to introduce a measure of non-Markovianity. This measure, however, requires demanding knowledge about the system and the environment. By using a quantum correlation monogamy property and an ancillary system, we propose a simplified measure with fewer requirements. Non-Markovianity is thereby decided by quantum state tomography of the system and the ancilla
  6. Keywords:
  7. Ancilla ; Ancillary system ; Quantum correlations ; Quantum discords ; Quantum dynamics ; Quantum state tomography ; Sufficient conditions ; Mathematical models ; Physics ; Quantum theory
  8. Source: Physical Review A - Atomic, Molecular, and Optical Physics ; Volume 85, Issue 5 , 2012 ; 10502947 (ISSN)
  9. URL: http://journals.aps.org/pra/abstract/10.1103/PhysRevA.85.052108