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Entanglement over global distances via quantum repeaters with satellite links

Physical Review A 2015年第5期91卷 052325-052325页

作者： K. Boone J.-P. Bourgoin E. Meyer-Scott K. Heshami T. Jennewein C. Simon Institute for Quantum Science and Technology and Department of Physics and Astronomy University of Calgary Calgary Alberta Canada T2N 1N4 Institute for Quantum Computing University of Waterloo Waterloo Ontario Canada N2L 3G1 National Research Council of Canada 100 Sussex Drive Ottawa Ontario Canada K1A 0R6 Quantum Information Science Program Canadian Institute for Advanced Research Toronto Ontario Canada M5G 1Z8

We study entanglement creation over global distances based on a quantum repeater architecture that uses low-Earth-orbit satellites equipped with entangled photon sources, as well as ground stations equipped with quantum nondemolition detectors and quantum memories. We show that this approach allows entanglement creation at viable rates over distances that are inaccessible via direct transmission through optical fibers or even from very distant satellites.

关键词： QUANTUM mechanics EARTH (Planet) ARTIFICIAL satellites DATA transmission systems OPTICAL fibers ORBIT

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Security loophole in free-space quantum key distribution due to spatial-mode detector-efficiency mismatch

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Physical Review A 2015年第6期91卷 062301-062301页

作者： Shihan Sajeed Poompong Chaiwongkhot Jean-Philippe Bourgoin Thomas Jennewein Norbert Lütkenhaus Vadim Makarov Institute for Quantum Computing University of Waterloo Waterloo Ontario N2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo Ontario N2L 3G1 Canada Department of Physics and Astronomy University of Waterloo Waterloo Ontario N2L 3G1 Canada Quantum Information Science Program Canadian Institute for Advanced Research Toronto Ontario M5G 1Z8 Canada

In free-space quantum key distribution (QKD), the sensitivity of the receiver's detector channels may depend differently on the spatial mode of incoming photons. Consequently, an attacker can control the spatial mode to break security. We experimentally investigate a standard polarization QKD receiver and identify sources of efficiency mismatch in its optical scheme. We model a practical intercept-and-resend attack and show that it would break security in most situations. We show experimentally that adding an appropriately chosen spatial filter at the receiver's entrance may be an effective countermeasure.

关键词： QUANTUM mechanics SENSITIVITY analysis PHOTONS information storage & retrieval systems -- Security measures OPTICAL polarization

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Implementation and evaluation of animation controls sufficient for conveying ASL facial expressions 14

Implementation and evaluation of animation controls sufficie...

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16th International ACM SIGACCESS Conference on Computers and Accessibility, ASSETS 2014

作者： Kacorri, Hernisa Huenerfauth, Matt Graduate Center CUNY Computer Science Ph.D. Program 365 Fifth Ave. New YorkNY10016 United States Golisano College of Computing and Information Sciences 20 Lomb Memorial Drive RochesterNY14623 United States

ISBN: (纸本)9781450327206

Technology to automatically synthesize linguistically accurate and natural-looking animations of American Sign Language (ASL) from an easy-to-update script would make it easier to add ASL content to websites and media, thereby increasing information accessibility for many people who are deaf. We are investigating the synthesis of ASL facial expressions, which are grammatically required and essential to the meaning of sentences. To support this research, we have enhanced a virtual human character with face controls following the MPEG-4 Facial Action Parameter standard. In a user-study, we determined that these controls were sufficient for conveying understandable animations of facial expressions.

关键词： Animation

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Focal Structure Analysis in Large Biological Networks

Focal Structure Analysis in Large Biological Networks

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2014 3rd International Conference on Environment Energy and Biotechnology

作者： Fatih ?en Rolf T.Wig Nitin Agarwal Mutlu Mete Rafal Kasprzyk Integrated Computing Program EITand University of Arkansas at Little Rock Department of Information Science and Business Information Systems University of Arkansas at Little Rock Department of Information Science University of Arkansas at Little Rock Department of Computer Science & Information Systems Texas A&M University-Commerce

After the completion of the Human Genome Project,identifying relevant protein structures became an important factor for detecting new disease-related *** newly available large-scale networks of molecular structures within the cell have made it possible to study protein function(s)in the context of a *** Protein-Protein Interaction(PPI)networks have been studied through the identification of clusters or communities by ***,however,interact in smaller and more pertinent groups.A new methodology,called Focal Structures Analysis(FSA),is presented to identify focal structures,i.e.,smaller and more relevant *** research advances our understanding of the role and impact of the focal structures and can help researchers with discovering protein related diseases.

关键词： PPI networks,focal structures,FSA,Louvain method

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Database systems for the smart grid

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Green Energy and Technology 2013年 132卷 151-168页

作者： Aung, Zeyar Computing and Information Science Program Masdar Institute of Science and Technology Block 3 Masdar City Abu Dhabi 54224 United Arab Emirates

ISBN: (纸本)9781447152095

In this chapter, two aspects of database systems, namely database management and data mining, for the smart grid are covered. The uses of database management and data mining for the electrical power grid comprising of the interrelated subsystems of power generation, transmission, distribution, and utilization are discussed. © Springer-Verlag London 2013.

关键词： Smart power grids

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Strong Loophole-Free Test of Local Realism*

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Physical Review Letters 2015年第25期115卷 250402-250402页

作者： Lynden K. Shalm Evan Meyer-Scott Bradley G. Christensen Peter Bierhorst Michael A. Wayne Martin J. Stevens Thomas Gerrits Scott Glancy Deny R. Hamel Michael S. Allman Kevin J. Coakley Shellee D. Dyer Carson Hodge Adriana E. Lita Varun B. Verma Camilla Lambrocco Edward Tortorici Alan L. Migdall Yanbao Zhang Daniel R. Kumor William H. Farr Francesco Marsili Matthew D. Shaw Jeffrey A. Stern Carlos Abellán Waldimar Amaya Valerio Pruneri Thomas Jennewein Morgan W. Mitchell Paul G. Kwiat Joshua C. Bienfang Richard P. Mirin Emanuel Knill Sae Woo Nam National Institute of Standards and Technology 325 Broadway Boulder Colorado 80305 USA Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo 200 University Avenue West Waterloo Ontario Canada N2L 3G1 Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA National Institute of Standards and Technology 100 Bureau Drive Gaithersburg Maryland 20899 USA Département de Physique et d’Astronomie Université de Moncton Moncton New Brunswick E1A 3E9 Canada Joint Quantum Institute National Institute of Standards and Technology and University of Maryland 100 Bureau Drive Gaithersburg Maryland 20899 USA Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena California 91109 USA ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology 08860 Castelldefels (Barcelona) Spain ICREA-Institució Catalana de Recerca i Estudis Avançats 08015 Barcelona Spain Quantum Information Science Program Canadian Institute for Advanced Research Toronto Ontario Canada

We present a loophole-free violation of local realism using entangled photon pairs. We ensure that all relevant events in our Bell test are spacelike separated by placing the parties far enough apart and by using fast random number generators and high-speed polarization measurements. A high-quality polarization-entangled source of photons, combined with high-efficiency, low-noise, single-photon detectors, allows us to make measurements without requiring any fair-sampling assumptions. Using a hypothesis test, we compute p values as small as 5.9×10−9 for our Bell violation while maintaining the spacelike separation of our events. We estimate the degree to which a local realistic system could predict our measurement choices. Accounting for this predictability, our smallest adjusted p value is 2.3×10−7. We therefore reject the hypothesis that local realism governs our experiment.

关键词： Nonlocality Optical tests of quantum theory Quantum communication Quantum foundations

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Terminology Learning through Taxonomy Discovery

Terminology Learning through Taxonomy Discovery

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Brazilian Conference on Intelligent Systems (BRACIS)

作者： Raphael Melo Kate Revoredo Aline Paes Postgraduate Information Systems Program UNIRIO Brazil Department of Computer Science Institute of Computing Brazil

Description Logics based languages have emerged as the standard knowledge representation scheme for ontologies. Typically, an ontology formalizes a number of dependent and related concepts in a domain, encompassed as a terminology. As defining such terminologies manually is a complex, time consuming and error-prone task, there is great interest and even demands for methods that learn terminologies automatically. Learning a terminology in Descriptions Logics concerns to learn several related concepts. This process would greatly benefit of an ideal order to determine which concept should be learned before another concept. Arguably, such an order would yield rich and readable terminologies, as previously, and interrelated concepts formerly learned could be used to induce the description of further concepts. In this work, we contribute with a formal definition of the concept and terminology learning problems and from such definitions we devise an algorithm for finding an ordering through concept taxonomy discovery, that should be followed when learning several related concepts. We show through an experiment that by following the order detected by the algorithm, we are able to afford a more readable terminology than methods that do not conceive an ideal order or do not learn concepts in a dependent way.

关键词： Terminology Taxonomy Knowledge based systems Ontologies Cognition Semantics

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Privacy Preservation Scheme for Multicast Communications in Smart Buildings of the Smart Grid

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Smart Grid and Renewable Energy 2013年第4期4卷 313-324页

作者： Depeng Li Zeyar Aung Srinivas Sampalli John Williams Abel Sanchez Computing and Information Science Program Masdar Institute of Science and Technology Abu Dhabi UAE Faculty of Computer Science Dalhousie University Halifax Canada Massachusetts Institute of Technology (MIT) Cambridge USA.

Privacy preservation is a crucial issue for smart buildings where all kinds of messages, e.g., power usage data, control commands, events, alarms, etc. are transmitted to accomplish the management of power. Without appropriate privacy protection schemes, electricity customers are faced with various privacy risks. Meanwhile, the natures of smart grids and smart buildings—such as having limited computation power of smart devices and constraints in communication network capabilities, while requiring being highly reliable—make privacy preservation a challenging task. In this paper, we propose a group key scheme to safeguard multicast privacy with the provisions of availability, fault-tolerance, and efficiency in the context of smart buildings as a part the smart grid. In particular, hybrid architecture accommodating both centralized and contributory modes is constructed in order to achieve both fault-tolerance and efficiency with only one set of group key installed. Key trees are sophisticatedly managed to reduce the number of exponentiation operations. In addition, an individual rekeying scheme is introduced for occasional joining and leaving of member smart meters. Experimental results, on a simulation platform, show that our scheme is able to provide significant performance gains over state-of-the-art methods while effectively preserving the participants’ privacy.

关键词： AMI Building Area Networks Group Key Multicasting Privacy Smart Building Smart Grid

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11th German Conference on Chemoinformatics (GCC 2015) Abstracts

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JOURNAL OF CHEMINFORMATICS 2016年第SUPPL 1期8卷 1-27页

作者： [Anonymous] GDCh-CIC Division Associated Board Member Beilstein-Institut zur Förderung der Chemischen Wissenschaften Trakehner Str. 7-9 60487 Frankfurt Germany. ufechner@beilstein-institut.de. Division Medicinal Chemistry Amsterdam Institute for Molecules Medicines and Systems (AIMMS) VU University Amsterdam The Netherlands. Centre for Bioinformatics Uni Hamburg Bundesstr. 43 20146 Hamburg Germany. Sanofi-Aventis Deutschland GmbH 65926 Frankfurt am Main Germany. stefan.guessregen@***. Sanofi-Aventis Deutschland GmbH 65926 Frankfurt am Main Germany. GlaxoSmithKline Stevenage SG1 2NY UK. nicola.j.richmond@***. Discngine Paris 75011 France. Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Germany. marwin.segler@wwu.de. Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Germany. Bundeskriminalamt Wiesbaden Central Analytics II 65173 Wiesbaden Germany. Department of Chemistry and Biochemistry University of California Santa Barbara CA 93111 USA. shea@chem.ucsb.edu. Department of Chemistry and Biochemistry University of California Santa Barbara CA 93111 USA. Chemistry Department Ludwig-Maximilians-Universität München Butenandtstr. 7 81377 Munich Germany. Inorganic Chemistry and Center for Nanointegration University of Duisburg-Essen Essen Germany. CAM-D Technologies Essen Germany. Institute for Bioinformatics and Chemoinformatics Westphalian University of Applied Sciences Recklinghausen Germany. Institute for Bioinformatics and Chemoinformatics Westphalian University of Applied Sciences Recklinghausen Germany. achim.zielesny@w-hs.de. Leiden University Leiden Netherlands. j.fraaije@chem.leidenuniv.nl. Culgi BV Berlin Germany. Physikalische Chemie III TU Dortmund 44227 Dortmund Germany. stefan.kast@tu-dortmund.de. Centre for Molecular Informatics Department of Chemistry University of Cambridge Lensfield Road Cambridge CB2 1EW United Kingdom. kcb27@cam.ac.uk. Centre for Molecular Informatics Department of Chemistry

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ASIS&T annual meeting pre-conference activities: information behavior on the move: 2013 ASIS&T SIG/USE research symposium

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Bulletin of the Association for information science and Technology 2014年第3期40卷

作者： Denise E. Agosto Lorri Mon Rong Tang Associate Professor College of Computing & Informatics Drexel University and editor of the Journal of Research on Libraries & Young Adults Associate Professor and Chair The MS-IT program in the Florida State University College of Communication and Information Associate Professor and Director Simmons Usability Lab in the Graduate School of Library and Information Science Simmons College

EDITOR'S SUMMARY The 13th Annual SIG/USE Research Symposium focused on ways mobile technologies have influenced information needs, seeking and use. In her keynote address, Caroline Haythornthwaite framed movement as changing contributorship, interactions and participation in multiple knowledge communities. A series of Ignite talks on the common theme of mobility followed, with topics ranging from mobile phones as the preferred Internet access device, credibility of mobile applications and online resources and public libraries' use of social media and mobile applications to mobile apps promoting health information literacy and supporting teleworking. Small groups brainstormed on opportunities, challenges and research ideas inspired by the theme. Annual SIG/USE awards recognized scholars for innovative work on topics including refugees' information seeking, factors influencing scholars' data sharing and drawings as visual representations of information. The symposium closed with encouragement to consider how information on the move influences perspectives and research into information behavior.

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