Bound entangled states with nonzero distillable key rate

In this paper, we present sufficient conditions for states to have positive distillable key rate. Exploiting the conditions, we show that the bound entangled states given by Horodecki et al. [Phys. Rev. Lett. 94, 160502 (2005), quant-ph/0506203] have nonzero distillable key rate, and finally exhibit a new class of bound entangled states with positive distillable key rate, but with negative Devetak-Winter lower bound of distillable key rate for the ccq states of their privacy squeezed versions.Comment: 7 pages, 1 figure, typos corrected, accepted for publication in PR

Quantum states for perfectly secure secret sharing

In this work, we investigate what kinds of quantum states are feasible to perform perfectly secure secret sharing, and present its necessary and sufficient conditions. We also show that the states are bipartite distillable for all bipartite splits, and hence the states could be distillable into the Greenberger-Horne-Zeilinger state. We finally exhibit a class of secret-sharing states, which have an arbitrarily small amount of bipartite distillable entanglement for a certain split.Comment: 4 page

Lattice Based Cryptography for Beginners

The purpose of this lecture note is to introduce lattice based cryptography, which is thought to be a cryptosystem of post-quantum age. We have tried to give as many details possible specially for novice on the subject. Something may be trivial to an expert but not to a novice. Many fundamental problems about lattice are thought to be hard even against quantum computer, compared to factorization problem which can be solved easily with quantum computer, via the celebrated Shor factorization quantum algorithm. The first part of our presentation is based on slides of Christ Peikert 2013 Bonn lecture (crypt@b-it2013). We, more or less, give somewhat detailed explanation of Professor Peikert\u27s lecture slides. We unfortunately could not attend his Bonn class. We are afraid that there are many mistakes in this note; if any, they are due to our misunderstanding of the material. Part II of our lecture note is on ring LWE, based on the paper ``A tool-kit for Ring-LWE Cryptography by Lyubashevsky, Peikert and Regev. Part III is about multilinear maps together with cryptanalysis of GGH map due to Hu and Jia. Our presentation follows professor Steinfeld\u27s lecture slides on GGHLite, and the paper by Yupu Hu and Huiwen Jia. When you read this lecture note, the corresponding original paper should be accompanied. We thank professor Jung Hee Cheon for introducing the subject and asking Dong Pyo Chi to give a lecture on the subject at the department of mathematics in Seoul National University. We also thank Hyeongkwan Kim for many helps, especially many corrections and improvements of the manuscript during the 2015 Summer session at UNIST. We also thank the students who took the classes at SNU and UNIST. The lecture was given by a novice for novice, so many mistakes are unavoidable. If the reader lets us know any errors, we will very much appreciate it

Concept analysis of transition to motherhood: a methodological study

Purpose Although the term “transition to motherhood” is commonly used in research, the concept is not clear. This study, hence, was conducted to clarify the concept of “transition to motherhood.” Methods The concept analysis framework developed by Walker and Avant is used to analyze the concept of transition to motherhood. Results Transition to motherhood is defined as the physical, psychological, social, and relational (mother-baby relationship/interpersonal relationship) changes that happen to a woman after pregnancy and delivery of a baby. The attributes of the transition to motherhood include: 1) adapting to physical changes after pregnancy and childbirth; 2) experiencing various psychological changes; 3) changing of her social perception from being a woman to someone’s mother; and 4) forming and developing a relationship with the newborn, adjusting priorities, and redefining the relationship between family and others. Meeting the newborn is regarded as an antecedent of the transition to motherhood. Redefining identity and physical image, ensuring mother’s well-being, maternal attachment, and confidence in the maternal role are regarded as consequences of the transition to motherhood. The concept was clarified by the presentation of model, borderline, and contrary cases. Conclusion The significance of this study lies in the clarification of the concept of transition to motherhood and defining its attributes. It is recommended that tools be developed to measure transition to motherhood based on the results of this study. Furthermore, nurses and midwives can use study findings to better understand the concept of transition to motherhood in providing care and support to mothers who experience it

Effects of 92% oxygen administration on cognitive performance and physiological changes of intellectually and developmentally disabled people

Background: The present study addressed how 92% oxygen administration affects cognitive performance, blood oxygen saturation (SpO(2)), and heart rate (HR) of intellectually and developmentally disabled people. Methods: Seven males (28.9 +/- 1.8 years) and seven females (34.4 +/- 8.3 years) with intellectual and developmental disabilities (disabled level 2.1 +/- 0.5) completed an experiment consisting a 0-back task with normal air (21% oxygen) administered in one run and hyperoxic air (92% oxygen) administered in the other run. The experimental sequence in each run consisted of a 1-min adaptation phase, 2-min control phase, and 2-min 0-back task phase, where SpO(2) and HR were gauged for each phase. Results: The administration of 92% oxygen increased 0-back task performance of intellectually and developmentally disabled people, in association with increased SpO(2) and decreased HR. Our results demonstrate that sufficient oxygen supply subserving cognitive functions, even as a short-term effect, could increase cognitive ability for the intellectually and developmentally disabled people. Conclusions: It is concluded that enriched oxygen can positively affect, at least in the short-term, the working memory of those with intellectual and developmental disabilityopen0