Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevA.87.042301
Title: Vanishing quantum discord is not necessary for completely positive maps
Authors: Brodutch, A.
Datta, A.
Modi, K. 
Rivas, A.
Rodríguez-Rosario, C.A.
Issue Date: 1-Apr-2013
Citation: Brodutch, A., Datta, A., Modi, K., Rivas, A., Rodríguez-Rosario, C.A. (2013-04-01). Vanishing quantum discord is not necessary for completely positive maps. Physical Review A - Atomic, Molecular, and Optical Physics 87 (4) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.87.042301
Abstract: The description of the dynamics of a system that may be correlated with its environment is only meaningful within the context of a specific framework. Different frameworks rely upon different assumptions about the initial system-environment state. We reexamine the connections between complete positivity and quantum discord within two different sets of assumptions about the relevant family of initial states. We present an example of a system-environment state with nonvanishing quantum discord that leads to a completely positive map. This invalidates an earlier claim about the necessity of vanishing quantum discord for completely positive maps. In our final remarks, we discuss the physical validity of each approach. © 2013 American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/116673
ISSN: 10502947
DOI: 10.1103/PhysRevA.87.042301
Appears in Collections:Staff Publications

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