Deterministic Dense Coding and Faithful Teleportation with Multipartite Graph States

We proposed novel schemes to perform the deterministic dense coding and faithful teleportation with multipartite graph states. We also find the sufficient and necessary condition of a viable graph state for the proposed scheme. That is, for the associated graph, the reduced adjacency matrix of the Tanner-type subgraph between senders and receivers should be invertible.Comment: 10 pages, 1 figure;v2. discussions improve

Multipartite Entanglement Measures and Quantum Criticality from Matrix and Tensor Product States

We compute the multipartite entanglement measures such as the global entanglement of various one- and two-dimensional quantum systems to probe the quantum criticality based on the matrix and tensor product states (MPSs/TPSs). We use infinite time-evolving block decimation (iTEBD) method to find the ground states numerically in the form of MPSs/TPSs, and then evaluate their entanglement measures by the method of tensor renormalization group (TRG). We find these entanglement measures can characterize the quantum phase transitions by their derivative discontinuity right at the critical points in all models considered here. We also comment on the scaling behaviors of the entanglement measures by the ideas of quantum state renormalization group transformations.Comment: 22 pages, 11 figure

Intramuscular Hemangioma of the Temporalis Muscle With Incidental Finding of Bilateral Symmetric Calcification of the Basal Ganglia: A Case Report

We report an 11-year-old boy whose brain computed tomography findings incidentally revealed bilateral basal ganglia calcification. He was symptom-free and had no abnormal neurological findings. He was diagnosed with Fahr's disease based on radiological findings and after excluding other etiologies such as infection, metabolic disorders, congenital malformation and malignancies. Most of the reported cases display an autosomal dominant mode of inheritance. Although Fahr's disease is a rare cause of basal ganglia calcification in children, this disease should be considered in children with a family history of neuropsychiatric disorders

Entanglement entropy with localized and extended interface defects

The quantum Ising chain of length, L, which is separated into two parts by localized or extended defects is considered at the critical point where scaling of the interface magnetization is non-universal. We measure the entanglement entropy between the two halves of the system in equilibrium, as well as after a quench, when the interaction at the interface is changed for time t>0. For the localized defect the increase of the entropy with log(L) or with log(t) involves the same effective central charge, which is a continuous function of the strength of the defect. On the contrary for the extended defect the equilibrium entropy is saturated, but the non-equilibrium entropy has a logarithmic time-dependence the prefactor of which depends on the strength of the defect.Comment: 9 pages, 6 figure