Distillation of Multi-Party Non-Locality With and Without Partial Communication

Non-local correlations are one of the most fascinating consequences of quantum physics from the point of view of information: Such correlations, although not allowing for signaling, are unexplainable by pre-shared information. The correlations have applications in cryptography, communication complexity, and sit at the very heart of many attempts of understanding quantum theory -- and its limits -- better in terms of classical information. In these contexts, the question is crucial whether such correlations can be distilled, i.e., whether weak correlations can be used for generating (a smaller amount of) stronger. Whereas the question has been studied quite extensively for bipartite correlations (yielding both pessimistic and optimistic results), only little is known in the multi-partite case. We show that a natural generalization of the well-known Popsecu-Rohrlich box can be distilled, by an adaptive protocol, to the algebraic maximum. We use this result further to show that a much bigger class of correlations, including all purely three-partite correlations, can be distilled from arbitrarily weak to maximal strength with partial communication, i.e., using only a subset of the channels required for the creation of the same correlation from scratch. In other words, we show that arbitrarily weak non-local correlations can have a "communication value" in the context of the generation of maximal non-locality.Comment: 5 pages, 3 figure

Overtime work, dual job holding and taxation

Traditionally, labour supply data do not include much information on hours and wages in secondary job or overtime work. In this paper, we estimate labour supply models based on survey information on hours and wages in overtime work and second job which is merged to detailed register information on income taxes, deductions, taxable income etc. We also allow for the effect of observed fixed costs in main occupation and unobserved fixed costs in second job, and a ‘stigmatization effect’ from unemployment. The estimated models follow a ‘Hausman-approach’. The results indicate that the labour supply elasticities are highly sensitive to the inclusion of information on overtime work and secondary job and to the handling of fixed costs of work. The estimated elasticities are numerically larger when explicit information on overtime and second job work is taken into account compared to traditional labour supply models without explicit information on overtime pay and second job wages. However, when the model allows for stigmatization effects and unobserved fixed costs of work in second job, the resulting elasticities reduce considerably.Labour supply; Dual job holding; Overtime work; Piecewise linear budget constraints

Computational Modeling of the Mechanism of Urease

In order to elucidate aspects of the mechanism of the hydrolytic enzyme urease, theoretical calculations were undertaken on a model of the active site, using density functional theory. The bridging oxygen donor that has been found in the crystal structures was determined to be a hydroxide ion. The initial coordination of urea at the active site occurs most likely through the urea oxygen to the nickel ion with the lowest coordination number. This coordination can be made without much gain in energy. The calculations also showed that weak coordination of one of the urea amine nitrogen atoms to the second nickel atom is energetically feasible. Furthermore, a proposed mechanism including a tetrahedral intermediate generated by hydrolytic attack on the urea carbon by the bridging hydroxide was modeled, and the tetrahedral intermediate was found to be energetically unfavorable relative to terminal coordination of the substrate (urea)

Simultaneous v. sequential lineups: What do we really know?

Both conceptual and metaanalyses of the effects of simultaneous and sequential lineup testing procedures on false alarm and hit rates suggest that recent interest in moving to sequential lineups might be premature. A simple criterion-shift model based on signal detection analysis accounted for the results from the metaanalysis raising concern that the previously accepted relative v. absolute decision strategy view may be incorrect. The accepted view that hit rates will be unaffected by a change in procedure may be incorrect. Monte Carlo simulation results raise the possibility that serial position might play a much larger and more complicated role in performance on sequential lineups than has been considered. Much more research is needed before the sequential procedure is adopted

Screening asylum seekers in Denmark for torture using a structured questionnaire

The United Nations Committee against Torture recommends systematic torture screening throughout the asylum process.   The goal of this study is to evaluate the introduction of a structured questionnaire, coding for torture according to the definition from United Nations Convention Against Torture (UNCAT). This screening for torture is now an integrated part of the medical reception of newly arrived asylum seekers The screening was carried through during a 2 years period as a part of the routine health screening, and alleged torture victims were referred to further medical examination and offered assistance to carry information about the torture to the Immigration Service. The participation rate was 85.2%, and torture was reported among 27.8% of the males, with a mean of 21.2% among both sexes. Key words: Torture, screening, questionnaire, asylum seekers, UNCA