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The Sudden Change Phenomenon of Quantum Discord

  • Lucas C. CéleriEmail author
  • Jonas Maziero
Chapter
Part of the Quantum Science and Technology book series (QST)

Abstract

Even if the parameters determining a system’s state are varied smoothly, the behavior of quantum correlations alike to quantum discord, and of its classical counterparts, can be very peculiar, with the appearance of non-analyticities in its rate of change. Here we review this sudden change phenomenon (SCP) discussing some important points related to it: Its uncovering, interpretations, and experimental verifications, its use in the context of the emergence of the pointer basis in a quantum measurement process, its appearance and universality under Markovian and non-Markovian dynamics, its theoretical and experimental investigation in some other physical scenarios, and the related phenomenon of double sudden change of trace distance discord. Several open questions are identified, and we envisage that in answering them we will gain significant further insight about the relation between the SCP and the symmetry-geometric aspects of the quantum state space.

Keywords

Quantum discord Open systems Decoherence Sudden change 

Notes

Acknowledgements

We acknowledge financial support from the Brazilian funding agencies CNPq (Grants No. 401230/2014-7, 445516/2014-3, 305086/2013-8, 441875/2014-9 and 303496/2014-2) and CAPES (Grant No. 6531/2014-08), the Brazilian National Institute of Science and Technology of Quantum Information (INCT/IQ). JM gratefully acknowledges the hospitality of the Physics Institute and Laser Spectroscopy Group at the Universidad de la República, Uruguay.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Instituto de FísicaUniversidade Federal de GoiásGoiâniaBrazil
  2. 2.Departamento de Física, Centro de Ciências Naturais e ExatasUniversidade Federal de Santa MariaSanta MariaBrazil
  3. 3.Instituto de Física, Facultad de IngenieríaUniversidad de la RepúblicaMontevideoUruguay

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