Higher dimensional quantum communication in a curved spacetime: an efficient simulation of the propagation of the wavefront of a photon

A photon with a modulated wavefront can produce a quantum communication channel in a larger Hilbert space. For example, higher dimensional quantum key distribution (HD-QKD) can encode information in the transverse linear momentum (LM) or orbital angular momentum (OAM) modes of a photon. This is markedly different than using the intrinsic polarization of a photon. HD-QKD has advantages for free space QKD since it can increase the communication channel\~Os tolerance to bit error rate (BER) while maintaining or increasing the channels bandwidth. We describe an efficient numerical simulation of the propagation photon with an arbitrary complex wavefront in a material with an isotropic but inhomogeneous index of refraction. We simulate the waveform propagation of an optical vortex in a volume holographic element in the paraxial approximation using an operator splitting method. We use this code to analyze an OAM volume-holographic sorter. Furthermore, there are analogue models of the evolution of a wavefront in the curved spacetime environs of the Earth that can be constructed using an optical medium with a given index of refraction. This can lead to a work-bench realization of a satellite HD-QKD system.Comment: 20 pages, 7 figure

How to Determine Shrinkage in Grain

PDF pages: 1

Festo: Blessing to Patent Holders or Thorn in Their Sides?

The Supreme Court makes another attempt to strike a balance between protecting an inventor\u27s patent rights and ensuring adequate notice to the public of what constitutes patent infringement. This iBrief discusses the Supreme Court ruling in Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Co., Ltd. and its foreseeable effects on the practice of patent law

Protecting the Viability of the Small Donor in Modern Elections

Campaign finance reform stands as one of the most important issues in today’s modern elections. From national to municipal contests, the influx of large donations places wealthy individuals—and interests—at odds with the average voter. Over the years, volumes of academic and legislative reforms have been proposed that encompass a wide range of electoral subject matter. From Citizens United to Federal Elections Commission (FEC) control mechanisms, solutions on how to change our campaign finance regulatory regime cover a large and diverse area of law and policy. However, the central theme throughout these reforms is maximizing transparency and curbing the undue influence of candidates through large donations

Buffalo School Board Governance

The Board of Education of the Buffalo City School District consists of nine members elected annually by the voters of the school district. Six members represent sub-districts within the city in three-year terms. Three members serve in an “at-large” capacity for five-year terms. A School board member must be a citizen of the United States, qualified to vote, able to read and write, eighteen (18) years of age or older, a qualified voter of the District, and the only member of their family serving on the board. At-large members must be residents of the school district for at least three years prior to the election. If representing a sub-district, a candidate must be a resident of the sub district for one year prior to the election as well as lived in the school district for three years prior. No member may be a candidate for or hold another elected office while serving on the school board

Our Responsibilities to Refugees

The paper explores the basis of the responsibilities we owe to refugees. That we have such responsibilities is a very widely shared intuition: the need of those fleeing from persecution seems to call out for a response on our part. But what exactly are our obligations to such people? Who are they owed to and why do we have them? The paper argues in favour of a human rights approach to refugee protection that includes the requirement of the implementation of a burden sharing scheme. DOI 10.17879/95189441435

Defending Contingentism in Metaphysics

Metaphysics is supposed to tell us about the metaphysical nature of our world: under what conditions composition occurs; how objects persist through time; whether properties are universals or tropes. It is near orthodoxy that whichever of these sorts of metaphysical claims is true is necessarily true. This paper looks at the debate between that orthodox view and a recently emerging view that claims like these are contingent, by focusing on the metaphysical debate between monists and pluralists about concrete particulars. This paper argues that we should be contingentists about monism and pluralism, and it defends contingentism against some necessitarian objections by offering an epistemology of contingent metaphysical claims

An Updated Rounds Checklist to Increase Appropriate Use of Telemetry Monitoring

Background: Telemetry monitoring is an essential tool to monitor cardiac electrical activity. Its overuse is costly in time and resources and leads to subsequent testing and treatments that are not necessary for the patient and, in addition, healthcare staff is burdened with work that is potentially not clinically useful. Aim: The global aim of increasing efficiency in telemetry use starts with the local improvement to facilitate nurse-physician communication of telemetry patients during Methods: This study with pre and post data collection looked at the results of quantitative data, collected in May-July 2015, on the number of patients with telemetry and the corresponding clinical indication before and after implementation of a modified rounds checklist which included telemetry as a discussion point. The new checklist was initiated on June 22, 2015 and post intervention data was gathered to determine if there was a decrease in the overuse of and increase in the appropriate use of telemetry. Results: With the implementation of the checklist the use of telemetry decreased, however the clinical indication for use did not improve. Conclusion and implications for CNL practice: After the implementation of the checklist criteria there has been a consistent decrease in telemetry use. This may attributable to improve nurse-physician communication, however, there is still a lack of appropriate clinical indication of use and the CNL, as lateral integrator, in future improvement projects, should support further modifications to the clinical indication set to improve appropriateness of telemetry use