Measurable bounds for Entanglement of Formation

We study the entanglement of formation for arbitrary dimensional bipartite mixed unknown states. Experimentally measurable lower and upper bounds for entanglement of formation are derived.Comment: 9 pages, 4 figure

Quantum Entanglement: Separability, Measure, Fidelity of Teleportation and Distillation

Quantum entanglement plays crucial roles in quantum information processing. Quantum entangled states have become the key ingredient in the rapidly expanding field of quantum information science. Although the nonclassical nature of entanglement has been recognized for many years, considerable efforts have been taken to understand and characterize its properties recently. In this review, we introduce some recent results in the theory of quantum entanglement. In particular separability criteria based on the Bloch representation, covariance matrix, normal form and entanglement witness; lower bounds, subadditivity property of concurrence and tangle; fully entangled fraction related to the optimal fidelity of quantum teleportation and entanglement distillation will be discussed in detail.Comment: 63 pages, 4 figure

Information collection in bargaining

I analyze a bilateral bargaining model with one-sided uncertainty about time preferences. The uninformed player has the option of halting the bargaining process to obtain additional information, when it is his turn to offer. For a wide class of preference settings, the uninformed player does not collect information when he is quite sure about his opponent’s type. There exist preference settings in which the uninformed player collects information until he is sufficiently sure about his opponent’s type, as long as the information source is accurate enough. With additional assumptions, the uninformed player is more likely to draw signals and is better off, if the information is more accurate.bargaining, alternate offers, incomplete information, delay

Lower Bounds of Concurrence for Multipartite States

We study the entanglement of multipartite quantum states. Some lower bounds of the multipartite concurrence are reviewed. We further present more effective lower bounds for detecting and qualifying entanglement, by establishing functional relations between the concurrence and the generalized partial transpositions of the multipartite systems.Comment: 13 page