Journal of Russian Laser Research

, Volume 36, Issue 6, pp 550–561 | Cite as

Quantum Discord and Entanglement Distribution as the Flow of Correlations Through a Dissipative Quantum System

  • N. Quinn
  • C. Croal
  • N. KorolkovaEmail author


In this paper, we study the propagation of quantum correlations in open quantum systems using quantum discord as their measure. The role of system–environment correlations in discord dynamics and some operational interpretations of discord are discussed, in particular, activation of correlations into entanglement. The quantum nature of correlations is studied in systems of optical modes, that is, Gaussian quantum states. A counter-intuitive scheme of entanglement distribution by an auxiliary mode, which remains separable at all times, is analyzed to unveil the synergy of coherence and dissipation in quantum protocols with mixed states.


quantum communication quantum discord quantum correlations open systems entanglement 


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.School of Physics and AstronomyUniversity of St. AndrewsScotlandUK

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