On variational definition of quantum entropy
Conference paper
Belavkin, R. 2014. On variational definition of quantum entropy. 34th International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering (MaxEnt 2014). Clos Lucé, Amboise, France 21 - 26 Sep 2014 American Institute of Physics (AIP). https://doi.org/10.1063/1.4905979
Type | Conference paper |
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Title | On variational definition of quantum entropy |
Authors | Belavkin, R. |
Abstract | Entropy of distribution $P$ can be defined in at least three different ways: 1) as the expectation of the Kullback-Leibler (KL) divergence of $P$ from elementary $\delta$-measures (in this case, it is interpreted as expected surprise); 2) as a negative KL-divergence of some reference measure $\nu$ from the probability measure $P$; 3) as the supremum of Shannon's mutual information taken over all channels such that $P$ is the output probability, in which case it is dual of some transportation problem. In classical (i.e. commutative) probability, all three definitions lead to the same quantity, providing only different interpretations of entropy. In non-commutative (i.e. quantum) probability, however, these definitions are not equivalent. In particular, the third definition, where the supremum is taken over all entanglements of two quantum systems with $P$ being the output state, leads to the quantity that can be twice the von~Neumann entropy. It was proposed originally by V.~Belavkin and Ohya \cite{Belavkin-Ohya02:_entan} and called the \emph{proper} quantum entropy, because it allows one to define quantum conditional entropy that is always non-negative. Here we extend these ideas to define also quantum counterpart of proper cross-entropy and cross-information. We also show inequality for the values of classical and quantum information. |
Keywords | Quantum information; von Neumann entropy; Entanglement; Quantum channel; Quantum entropy |
Research Group | Artificial Intelligence group |
Conference | 34th International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering (MaxEnt 2014) |
Proceedings Title | Bayesian Inference and Maximum Entropy Methods in Science and Engineering (MAXENT 2014) |
ISSN | 0094-243X |
ISBN | |
Hardcover | 9780735412804 |
Publisher | American Institute of Physics (AIP) |
Publication dates | |
24 Sep 2014 | |
Publication process dates | |
Deposited | 27 Apr 2015 |
Output status | Published |
Additional information | Published in: AIP Conference Proceedings, 1641, 197-204 (2015) |
Digital Object Identifier (DOI) | https://doi.org/10.1063/1.4905979 |
Web of Science identifier | WOS:000354648400020 |
Language | English |
https://repository.mdx.ac.uk/item/851x9
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