Generating GHZ state in 2m-qubit spin network

We consider a pure 2m-qubit initial state to evolve under a particular quantum me- chanical spin Hamiltonian, which can be written in terms of the adjacency matrix of the Johnson network J(2m;m). Then, by using some techniques such as spectral dis- tribution and stratification associated with the graphs, employed in [1, 2], a maximally entangled GHZ state is generated between the antipodes of the network. In fact, an explicit formula is given for the suitable coupling strengths of the hamiltonian, so that a maximally entangled state can be generated between antipodes of the network. By using some known multipartite entanglement measures, the amount of the entanglement of the final evolved state is calculated, and finally two examples of four qubit and six qubit states are considered in details.Comment: 22 page

Generating maximally entangled distant pair in invariant stratification spin networks

In this paper we study the generation of Bell states between distant vertices in a permanently coupled quantum spin network, interacting via invariant stratification graphs. To begin with we establish a class of upper bounds over achievable entanglement between the reference site and various vertices. We observe that the maximum of these upper bounds is 1 e-bit. We conclude that the reference site can generate a Bell state with a vertex if the corresponding upper bound of the vertex is 1 e-bit. Thus for generation of a Bell state this upper bound must be saturated. Taking this into account, we obtain the characteristic constraint of the proper graphs. We introduce a special class of antipodal invariant stratification graphs, which is called reflective, whereas the antipode vertex obeys the characteristic constraint. We also show that the antipodal association scheme graphs are reflective so Bell states can be generated between the antipodal vertices. Moreover we observe that in such graphs the proper Hamiltonian that enables creation of Bell state is the Heisenberg interaction between vertex pairs.Comment: 14 pages 2 figure

The inter-relationship between inoculum concentration, morphology, rheology and erythromycin productivity in submerged cultivation of Saccharopolyspora erythraea

Submerged cultivation of Saccharopolyspora erythraea, at different initial spore concentrations, was carried out to study the inter-relationship between inoculum concentration, morphology, rheology and erythromycin production. Pellet morphology was dominant in runs at 10³ and 10(4) spore/ml initial spore concentrations, whereas there was a significant presence of clump morphology in runs at initial spore concentrations of 10(5)-10(7) spore/ml. The S. erythraea cultivation broths exhibited Newtonian rheology in runs at initial spore concentrations of 10³ and 10(4) spore/ml, whereas at higher initial spore concentrations the rheological data could be fitted with the power law model. Runs in which clump morphology was predominant resulted in the highest erythromycin productivities. The findings of the present work suggest that the predominance of clump morphology, smaller sized clumps and, in the case of non-Newtonian S. erythraea cultivation broths, a decrease in viscosity enhance erythromycin production

A Low Complexity Scheme for Entanglement Distributor Buses

For technological purposes and theoretical curiosity, it is very interesting to have a building block that produces a considerable amount of entanglement between on-demand sites through a simple control of a few sites. Here, we consider permanently-coupled spin networks and study entanglement generation between qubit pairs to find low-complexity structures capable of generating considerable entanglement between various qubit pairs. We find that in axially symmetric networks the generated entanglement between some qubit pairs is rather larger than generic networks. We show that in uniformly-coupled spin rings each pair can be considerably entangled through controlling suitable vertices. To set the location of controlling-vertices, we observe that the symmetry has to be broken for a definite time. To achieve this, a magnetic flux can be applied to break symmetry via Aharonov-Bohm effect. Such a set up can serve as an efficient entanglement distributor bus in which each vertex-pair can be efficiently entangled through exciting only one fixed vertex and controlling the evolution time. The low-complexity of this scheme makes it attractive for use in nanoscale quantum information processors.Comment: 23 pages, 4 figures, Major revision, title changed, published versio

Predicting intensity of symptoms in patients with irritable bowel syndrome based on their mental health, quality of life, and the use of leisure time

Background: This study aimed to predict the intensity of symptoms in patients with irritable bowel syndrome (IBS) based on their mental health, quality of life, and use of leisure time. Materials and Methods: To do this, 300 patients were chosen from those who referred to two gastrointestinal clinics in north and east of Tehran by using target-based sampling method. Of them 92 patients filled out the Rome-III diagnostic questionnaire, Ryff Scale of Psychological Well-Being (RSPWB), SF-12 questionnaire, and leisure time questionnaire. Data were analyzed by using Pearson correlation coefficient and multiple stepwise logistic regression analysis. Results: The results showed that mental health, quality of life, and use of leisure time can predict the intensity of symptoms in these patients (p � 0.01). It was also observed that among the demographic variables, age (older patients), sex (female patients), marital status (married patients), level of education (low literacy skills), and the number of referrals to physicians can predict the intensity of symptoms (p � 0.01). Conclusion: It can be concluded that mental health turned out to be the strongest predictive variable. Also, quality of life and use of leisure time can predict the intensity of symptoms in patients. Hence, improving mental health and providing a better environment for living and recreation may have a positive outcome for patients with IBS. © 2018 Iranian Association of Gastroenterology and Hepatology. All rights reserved

Predicting intensity of symptoms in patients with irritable bowel syndrome based on their mental health, quality of life, and the use of leisure time

Background: This study aimed to predict the intensity of symptoms in patients with irritable bowel syndrome (IBS) based on their mental health, quality of life, and use of leisure time. Materials and Methods: To do this, 300 patients were chosen from those who referred to two gastrointestinal clinics in north and east of Tehran by using target-based sampling method. Of them 92 patients filled out the Rome-III diagnostic questionnaire, Ryff Scale of Psychological Well-Being (RSPWB), SF-12 questionnaire, and leisure time questionnaire. Data were analyzed by using Pearson correlation coefficient and multiple stepwise logistic regression analysis. Results: The results showed that mental health, quality of life, and use of leisure time can predict the intensity of symptoms in these patients (p � 0.01). It was also observed that among the demographic variables, age (older patients), sex (female patients), marital status (married patients), level of education (low literacy skills), and the number of referrals to physicians can predict the intensity of symptoms (p � 0.01). Conclusion: It can be concluded that mental health turned out to be the strongest predictive variable. Also, quality of life and use of leisure time can predict the intensity of symptoms in patients. Hence, improving mental health and providing a better environment for living and recreation may have a positive outcome for patients with IBS. © 2018 Iranian Association of Gastroenterology and Hepatology. All rights reserved