Topic
Coherent information
About: Coherent information is a research topic. Over the lifetime, 1225 publications have been published within this topic receiving 46672 citations.
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Papers
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21 Nov 2003TL;DR: In this paper, the classical information entropy defined by Wehrl in terms of the Husimi Q-function is discussed and generalized over the concepts of the WehrL phase distribution, and the wehrl intermode-correlation parameters.
Abstract: The classical information entropy defined by Wehrl in terms of the Husimi Q-function is discussed and generalized over the concepts of the Wehrl phase distribution, and the Wehrl intermode-correlation parameters. The classical entropic functions are applied to describe the quantum properties of single and/or two-mode optical fields.
4 citations
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TL;DR: The first experimental demonstration of the information-theoretic spin-1/2 inequality using the high-fidelity entangled state is performed and the evolution of information difference of entropy when photons passing through different noisy channels is studied.
Abstract: Inequalities of information entropic play a fundamental role in information theory and have been employed effectively in finding bounds on optimal rates of various information-processing tasks. In this paper, we perform the first experimental demonstration of the information-theoretic spin-1/2 inequality using the high-fidelity entangled state. Furthermore, we study the evolution of information difference of entropy when photons passing through different noisy channels and give the experimental rules of the information difference degradation. Our work provides an new essential tool for quantum information processing and measurement, and offers new insights into the dynamics of quantum correlation in open systems.
4 citations
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TL;DR: It is verified that the concept of the conventional error correction scheme does not play an important role to demonstrate, at least, the super additiveness of quantum channel, and that rather one can apply them to only selection of code word states with desirable Hamming distance.
Abstract: This paper presents a review and some results on problems of super additiveness in quantum channel for Shannon information. Especially, how to investigate concrete systems showing super additiveness is discussed. It is verified that the concept of the conventional error correction scheme does not play an important role to demonstrate, at least, the super additiveness of quantum channel, and that rather one can apply them to only selection of code word states with desirable Hamming distance. Finally, some properties of quantum reliability function are given, which are useful to discuss the general property of coding with super additiveness.
4 citations
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10 Jun 2007TL;DR: In this article, the authors review recent progress in mixed state discrimination, optical implementation of generalized measurements (POVMs) and selected applications and present a survey of the state discrimination literature.
Abstract: State discrimination constitutes the read-out stage of quantum information processing. Optimized discrimination strategies often involve generalized measurements (POVMs). The talk will review recent progress in mixed state discrimination, optical implementation of POVMs and selected applications. Article not available.
4 citations
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TL;DR: In this paper, an analysis of phase transitions and critical phenomena in quantum systems is presented based on geometrical considerations within the Riemannian space of thermodynamic parameters that characterize the system.
Abstract: We present, from an information theoretic viewpoint, an analysis of phase transitions and critical phenomena in quantum systems. Our study is based on geometrical considerations within the Riemannian space of thermodynamic parameters that characterize the system. A metric for the space can be derived from an appropriate definition of distance between quantum states. For this purpose, we consider generalized α-divergences that include the standard Kullback–Leibler relative entropy. The use of other measures of information distance is taken into account, and the thermodynamic stability of the system is discussed from this geometric perspective.
4 citations