Experimental demonstration of quantum teleportation of a squeezed state

Quantum teleportation of a squeezed state is demonstrated experimentally. Due to some inevitable losses in experiments, a squeezed vacuum necessarily becomes a mixed state which is no longer a minimum uncertainty state. We establish an operational method of evaluation for quantum teleportation of such a state using fidelity, and discuss the classical limit for the state. The measured fidelity for the input state is 0.85$\pm$ 0.05 which is higher than the classical case of 0.73$\pm$0.04. We also verify that the teleportation process operates properly for the nonclassical state input and its squeezed variance is certainly transferred through the process. We observe the smaller variance of the teleported squeezed state than that for the vacuum state input.Comment: 7 pages, 1 new figure, comments adde

Item response theory-based validation of a short form of the Eating Behavior Scale for Japanese adults

Obesity has become a serious social problem in industrialized countries in recent years. Clinically, although the evaluation of dietary behavior abnormalities is as important as any method of risk assessment for obesity, almost all the existing scales with many items may have numerous practical clinical difficulties. In this study, we aimed to prepare a short questionnaire to assess the dietary behavior abnormalities related to obesity. A total of 1032 individuals aged 20 to 59 years participated in the present study. Using item response theory (IRT), we selected the items for a short version from among 30 items of Sakata Eating Behavior Scale (EBS), which is widely used in Japan. As a result of the IRT-based analysis on the original 30-item version, 7 items were adopted as the short version. The correlation between the total score of the original EBS and the EBS short form was extremely high (r = 0.93, P = .001). In examining the criterion validity, for all participants (n = 1032), male (n = 516), and female (n = 516), the correlation coefficients between the total score of the EBS short form and body mass index (BMI) were r = 0.26, r = 0.28, and r = 0.28, respectively. The results of the receiver operating characteristic analysis was performed with obesity BMI > 25 kg/m2 as a dependent variable, the value of the area under the curve in the ROC was significantly higher in the 7-item version than in the total score of the original items (P = .0005). In conclusion, the 7-item EBS short form was created. Furthermore, it was found that the EBS short form is a reliable and valid measure that can be used as an indicator of obesity in both clinical and research settings

Exceeding classical capacity limit in quantum optical channel

The amount of information transmissible through a communications channel is determined by the noise characteristics of the channel and by the quantities of available transmission resources. In classical information theory, the amount of transmissible information can be increased twice at most when the transmission resource (e.g. the code length, the bandwidth, the signal power) is doubled for fixed noise characteristics. In quantum information theory, however, the amount of information transmitted can increase even more than twice. We present a proof-of-principle demonstration of this super-additivity of classical capacity of a quantum channel by using the ternary symmetric states of a single photon, and by event selection from a weak coherent light source. We also show how the super-additive coding gain, even in a small code length, can boost the communication performance of conventional coding technique.Comment: 4 pages, 3 figure

Implementation of generalized quantum measurements: superadditive quantum coding, accessible information extraction, and classical capacity limit

Quantum information theory predicts that when the transmission resource is doubled in quantum channels, the amount of information transmitted can be increased more than twice by quantum channel coding technique, whereas the increase is at most twice in classical information theory. This remarkable feature, the superadditive quantum coding gain, can be implemented by appropriate choices of code words and corresponding quantum decoding which requires a collective quantum measurement. Recently, the first experimental demonstration was reported [Phys. Rev. Lett. 90, 167906 (2003)]. The purpose of this paper is to describe our experiment in detail. Particularly, a design strategy of quantum collective decoding in physical quantum circuits is emphasized. We also address the practical implication of the gain on communication performance by introducing the quantum-classical hybrid coding scheme. We show how the superadditive quantum coding gain, even in a small code length, can boost the communication performance of conventional coding technique.Comment: 15 pages, 14 figure

Type A Behavior Pattern and Obesity in Japanese Workers: A Cross-Sectional Study

Obesity is associated with personality. The Type A behavior pattern (TABP), which is characterized by hostility and competitive behavior, is related to psychological stress. However, the relationship between obesity and the TABP has not been examined. This study aimed to examine the relationship between obesity and the Type A behavior pattern in 3,099 Japanese workers. The Type A behavior pattern was measured via the Maeda Type A Behavior Checklist. Data were analyzed using multivariate logistic regression adjusted for age, being current smokers, heavy drinker, lack of exercise, occupation, and rapid eating. The multivariate odds ratio (95% confidence interval) for obesity associated with TABP was 1.55 (1.13 to 2.13) in men. Regarding other variables, age, lack of exercise, and rapid eating were associated with obesity in men. The multivariate odds ratio (95% confidence interval) for obesity associated with TABP was 1.27 (0.81 to 2.02) in women. Regarding other variables, age andrapid eating were associated with obesity in women. The findings suggest that the Type A behavior pattern was associated with increased obesity prevalence in Japanese men. People with TABP tend to eat larger portions during mealtimes repeatedly by rapid eating; it is possible that eating large portions may lead to an increase weight in men with TABP

Maladjustment to Academic Life and Employment Anxiety in University Students with Irritable Bowel Syndrome

The present study tested our hypothesis that university students with irritable bowel syndrome (IBS) may experience less satisfactory academic lives than those of students without IBS. We also verified the hypothesis that university students with IBS might have higher employment anxiety than students without IBS might.We conducted a cross-sectional study of 1, 686 university students. Presence or absence of IBS was assessed via the Rome III Questionnaire. Two original items were used to evaluate academic life. The prevalence rates of IBS with diarrhea, IBS with constipation, mixed IBS, and unsubtyped IBS in the study population were 5%, 2%, 10%, and 3%, respectively. Regarding academic life, the proportions of participants who experienced maladjustment and employment anxiety were 29% and 50%, respectively. After adjusting for age, sex, and faculty, the odds ratios for maladjustment and employment anxiety were significantly higher in students who screened positively, relative to those who screened negatively, for IBS (OR, 1.62; 95% CI, 1.24-2.21; OR, 2.16; 95% CI, 1.68-2.81, respectively). In conclusion, maladjustment and anxiety over future employment were higher in university students with IBS relative to those without

看護学部教官業績目録 ; 2003年1月～12月

Acinetobacter baumannii ATCC 19606 tolerates loss of lipopolysaccharide (LPS) caused by inactivation of early LPS pathway genes. However, mutations in pathway genes encoding steps downstream of LpxD have not been reported, implying that later biosynthetic steps may be essential for viability. Here, we determined if LpxH, the UDP-2,3-diacylglucosamine hydrolase that generates UMP-2,3-diacylglucosamine 1-phosphate (lipid X), was essential in A. baumannii ATCC 19606. Multiple attempts to disrupt lpxH on the genome were unsuccessful. When expression of LpxH was placed under control of an isopropyl β-D-1-thiogalactopyranoside (IPTG) inducible promoter, the cells failed to grow under standard laboratory conditions without IPTG induction. Growth under LpxH depletion conditions (-IPTG) was rescued by chemical inhibition of LpxC, upstream of LpxH, indicating that toxic accumulation of LPS pathway intermediates underlies LpxH essentiality. Consistent with this, the levels of LpxH substrate (product of LpxD) and a C14:0(3-OH) acyl variant of the LpxD substrate had accumulated in cells that were depleted of LpxH causing a growth defect. Intriguingly, under these partial depletion conditions, there was also a smaller but reproducible accumulation of the downstream pathway intermediates disaccharide 1-monophosphate and lipid IVA suggesting a complex downstream response to LpxH depletion

Risks for public health related to the presence of furan and methylfurans in food

EFSA wishes to thank the hearing experts: Diana Doell and Ruud Woutersen and EFSA staff member: José Cortinas Abrahantes for the support provided to this scientific output. The CONTAM Panel acknowledges all European competent institutions and other stakeholders that provided occurrence data on furan and methylfurans in food, and supported the data collection for the Comprehensive European Food Consumption Database. Adopted: 20 September 2017Peer reviewedPublisher PD

Oligoether/Zwitterion Diblock Copolymers: Synthesis and Application as Cathode-Coating Material for Li Batteries

Poly (ethylene oxide) (PEO) has been investigated as an ion-conductive matrix for several decades due to its excellent properties. However, further improvements are needed to enable a PEO-based ion-conductive matrix for practical applications. In order to develop novel solid polymer electrolytes based on zwitterions, we synthesized diblock copolymers (PPEGMA-b-SPBs) with oligoether and zwitterionic side-chains and evaluated their physico-chemical properties. PPEGMA-b-SPBs with various unit ratios were synthesized by RAFT polymerization. PPEGMA-b-SPBs with/without LiTFSA exhibited two distinct glass transition temperatures regardless of the unit ratio of PEGMA and SPB. AFM observations clearly revealed phase-separated structures. The ionic conductivity of PPEGMA-b-SPBs increased even at a high salt concentrations such as [EO]:[Li] = 6:1 and was over 10−5 S cm−1 at 25 °C. This tendency is unusual in a PEO matrix. The oxidation stability of PPEGMA-b-SPBs was about 5.0 V vs. Li/Li+, which is a higher value than that of PEO. The improvement of the electrochemical properties is attributed to the introduction of the SPB block into the block copolymers. PPEGMA-b-SPBs were evaluated as cathode-coating materials for Li batteries. The discharge capacity and coulombic efficiency of the cells employing the cathode (LiNi1/3Mn1/3Co1/3O2 (NMC)) coated with the block copolymers were much higher than those of the cell employing the pristine cathode at the 50th cycle in the cut-off voltage range of 3.0–4.6 V