Physics – Quantum Physics
Scientific paper
2011-07-05
Physics
Quantum Physics
To be published in Springer's Lecture Notes in Computer Science as proceedings of The sixth Conference on the Theory of Quantu
Scientific paper
Positivity of quantum discord is shown to be equivalent to the strong sub additivity of the Von-Nuemann entropy. This leads to a connection between the mother protocol of quantum information theory [A. Abeyesinghe, I. Devetak, P. Hayden, and A. Winter, Proc. R. Soc. A 465, 2537, (2009)] and quantum discord. We exploit this to show that quantum discord is a measure coherence in the performance of the mother protocol. Since the mother protocol is a unification of an important class of problems (those that are bipartite, unidirectional and memoryless), we show quantum discord to be a measure of coherence in these protocols. Our work generalizes an earlier operational interpretation of quantum discord provided in terms of quantum state merging [V. Madhok and A. Datta, Phys. Rev. A 83, 032323, (2011)].
Datta Animesh
Madhok Vaibhav
No associations
LandOfFree
Role of quantum discord in quantum communication does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Role of quantum discord in quantum communication, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Role of quantum discord in quantum communication will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-677405