Measures of quantum correlations in infinite-dimensional systems

Abstract

Several important measures of quantum correlations of a state of a finite-dimensional composite system are defined as linear combinations of marginal entropies of this state. This paper is devoted to the infinite-dimensional generalizations of such quantities and to the analysis of their properties. We introduce the notion of faithful extension of a linear combination of marginal entropies and consider several concrete examples starting with the quantum mutual information and the quantum conditional entropy. Then we show that the conditional mutual information can be uniquely defined as a lower semicontinuous function on the set of all states of a tripartite infinite-dimensional system possessing all the basic properties valid in finite dimensions. Infinite-dimensional generalizations of some other measures of quantum correlations in multipartite quantum systems are also considered. It is shown that almost all of these generalized measures are globally lower semicontinuous and possess local continuity properties which essentially simplify their use in analysis of quantum systems. In the second part of the paper we consider applications of the general results of its first part, in particular, to the theory of infinite-dimensional quantum channels and their capacities. We also show the existence of the Fawzi-Renner recovery channel reproducing marginal states for all tripartite states (including states with infinite marginal entropies) starting with the corresponding finite-dimensional result.

59 pages, any comments are welcome, in v.2 Proposition 1 and its corollaries are strengthened by using Winter's modification of the Alicki-Fannes technic

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• Asymptotic state transformations of continuous variable resources
• Uniform continuity bounds for information characteristics of quantum channels depending on input dimension and on input energy
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• On discontinuity of information characteristics of quantum systems and channels
• Compactness criterion for families of quantum operations in the strong convergence topology and its applications
• Evolution of the holographic entanglement entropy quantities for composite quantum systems
• New monotonicity property of the quantum relative entropy
• Lower semicontinuity of the relative entropy disturbance and its corollaries