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How can one prove that a given state is entangled? In this paper we review different methods that have been proposed for… Expand Preface 1. Convexity, colours and statistics 2. Geometry of probability distributions 3. Much ado about spheres 4. Complex… Expand All our former experience with application of quantum theory seems to say that what is predicted by quantum formalism must occur… Expand This special issue of Mathematical Structures in Computer Science contains several contributions related to the modern field of… Expand Quantum entanglement is the main resource to endow the field of quantum information processing with powers that exceed those of… Expand Meeting the Universe Halfway is an ambitious book with far-reaching implications for numerous fields in the natural sciences… Expand Entanglement is a fundamental resource in quantum information theory. It allows performing new kinds of communication, such as… Expand The entanglement of a pure state of a pair of quantum systems is defined as the entropy of either member of the pair. The… Expand The optimal precision of frequency measurements in the presence of decoherence is discussed. We analyze different preparations of… Expand We propose a scheme to utilize photons for ideal quantum transmission between atoms located at spatially separated nodes of a… Expand