Entropy exchange, coherent information and concurrence

For a simple model we derive analytic expressions of entropy exchange and coherent information, from which relations between them and the concurrence are drawn. We find that in the quantum evolution the entropy exchange exhibits behavior \textsl{opposite} to that of the concurrence, whereas the coherent information shows features very similar to those of the concurrence. The meaning of this result for general systems is discussed.Comment: 4 pages, 8 figures v2: version accepted for publication in Phys. Rev.

Comment on ``Geometric phase of entangled spin pairs in a magnetic field''

The degree of entanglement between two spins may change due to interaction. About this we find that a wrong result in a recent work by Ge and Wadati [Phys. Rev. A {\bf72}, 052101(2005)] which breach the basic principle.Comment: 2 pages, comment on Phys. Rev. A {\bf72}, 052101(2005), and to appear in Phys. Rev.

A STUDY ON IMPROVING THE QUALITY OF EARLY CHILDHOOD TEACHERS' MAP－READING SKILLS IN THE CONTEXT OF THE "DOUBLE REDUCTION" POLICY

With the implementation of the "Double Reduction" policy, the focus of the curriculum has gradually shifted from the traditional recitation of knowledge points and test-taking training to the cultivation of disciplinary competence and literacy. Through reviewing relevant literature, it is found that the understanding and application of diagrams and charts are an important part of cultivating subject competence and literacy. As a common tool in teaching, charts and diagrams play an important role in early childhood education, and the improvement of early childhood teachers' ability to read charts and diagrams has become a greater concern. Therefore, this study adopts questionnaires and in-depth interviews to comprehensively assess the chart-reading ability of early childhood teachers, and then proposes corresponding improvement strategies. By improving the map-reading ability of kindergarten teachers, this study aims to support primary and secondary school teachers in using maps and charts effectively in classroom teaching, so as to ensure the continued effectiveness of the "Double Reduction" policy and to promote the all-round development of student

Internet of Things Cloud: Architecture and Implementation

The Internet of Things (IoT), which enables common objects to be intelligent and interactive, is considered the next evolution of the Internet. Its pervasiveness and abilities to collect and analyze data which can be converted into information have motivated a plethora of IoT applications. For the successful deployment and management of these applications, cloud computing techniques are indispensable since they provide high computational capabilities as well as large storage capacity. This paper aims at providing insights about the architecture, implementation and performance of the IoT cloud. Several potential application scenarios of IoT cloud are studied, and an architecture is discussed regarding the functionality of each component. Moreover, the implementation details of the IoT cloud are presented along with the services that it offers. The main contributions of this paper lie in the combination of the Hypertext Transfer Protocol (HTTP) and Message Queuing Telemetry Transport (MQTT) servers to offer IoT services in the architecture of the IoT cloud with various techniques to guarantee high performance. Finally, experimental results are given in order to demonstrate the service capabilities of the IoT cloud under certain conditions.Comment: 19pages, 4figures, IEEE Communications Magazin

Entanglement fidelity and measurement of entanglement preserving in quantum processes

The entanglement fidelity provides a measure of how well the entanglement between two subsystems is preserved in a quantum process. By using a simple model we show that in some cases this quantity in its original definition fails in the measurement of the entanglement preserving. On the contrary, the modified entanglement fidelity, obtained by using a proper local unitary transformation on a subsystem, is shown to exhibit the behavior similar to that of the concurrence in the quantum evolution.Comment: 4 pages, 2 figures. v2: repaired a severe oversight, removed an incorrect claim, added references; v3: version accepted for publication in Phys. Rev.

A direct calculation of critical exponents of two-dimensional anisotropic Ising model

Using an exact solution of the one-dimensional (1D) quantum transverse-field Ising model (TFIM), we calculate the critical exponents of the two-dimensional (2D) anisotropic classical Ising model (IM). We verify that the exponents are the same as those of isotropic classical IM. Our approach provides an alternative means of obtaining and verifying these well-known results.Comment: 3 pages, no figures, accepted by Commun. Theor. Phys.(IPCAS