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Optimal Eavesdropping in Quantum Cryptography with Six States
TLDR
A generalization of the quantum cryptographic protocol by Bennett and Brassard is discussed, using three conjugate bases, i.e. six states, and it is shown that this scheme is safer against eavesdropping on single qubits than the one based on two conjugates.
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Classification of mixed three-qubit states.
TLDR
A classification of mixed three-qubit states is introduced, in which the classes of separable, biseparable, W, and Greenberger-Horne-Zeilinger states are successively embedded into each other.
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Quantum Correlations in Systems of Indistinguishable Particles
We discuss quantum correlations in systems of indistinguishable particles in relation to entanglement in composite quantum systems consisting of well separated subsystems. Our studies are motivated…
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Distillability and partial transposition in bipartite systems
Institut fu¨r Theoretische Physik, Universit¨at Hannover, D-30167 Hannover, Germany(February 1, 2008)We study the distillability of a certain class of bipartitedensity operators which can be obtained…
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Characterizing Entanglement
Quantum entanglement is at the heart of many tasks in quantum information. Apart from simple cases (low dimensions, few particles, pure states), however, the mathematical structure of entanglement is…
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Separability and distillability in composite quantum systems-a primer
TLDR
This article presents a primer on the current state of knowledge concerning two problems of quantum information theory, and discusses the relation of these problems to one of the most challenging questions of linear algebra: the classification and characterization of positive operator maps.
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Experimental detection of multipartite entanglement using witness operators.
TLDR
A canonical way of constructing and decomposing witness operators so that they can be directly implemented with present technology is introduced and applied to three- and four-qubit entangled states of polarized photons, giving experimental evidence that the considered states contain true multipartite entanglement.
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Quantum information processing and communication
Abstract.We present an excerpt of the document “Quantum Information Processing and Communication: Strategic report on current status, visions and goals for research in Europe”, which has been…
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Lectures on Quantum Information
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Linking quantum discord to entanglement in a measurement.
We show that a von Neumann measurement on a part of a composite quantum system unavoidably creates distillable entanglement between the measurement apparatus and the system if the state has nonzero…
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