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arXiv 2017年

作者： Joshi, Siddarth Koduru Pienaar, Jacques Ralph, Timothy C. Cacciapuoti, Luigi McCutcheon, Will Rarity, John Giggenbach, Dirk Lim, Jin Gyu Makarov, Vadim Fuentes, Ivette Scheidl, Thomas Beckert, Erik Bourennane, Mohamed Bruschi, David Edward Cabello, Adan Capmany, Jose Carrasco-Casado, Alberto Diamanti, Eleni Dusek, Miloslav Elser, Dominique Gulinatti, Angelo Hadfield, Robert H. Jennewein, Thomas Kaltenbaek, Rainer Krainak, Michael A. Lo, Hoi-Kwong Marquardt, Christoph Milburn, Gerard Peev, Momtchil Poppe, Andreas Pruneri, Valerio Renner, Renato Salomon, Christophe Skaar, Johannes Solomos, Nikolaos Stipčević, Mario Torres, Juan P. Toyoshima, Morio Villoresi, Paolo Walmsley, Ian Weihs, Gregor Weinfurter, Harald Zeilinger, Anton Zukowski, Marek Ursin, Rupert Institute for Quantum Optics and Quantum Information Austrian Academy of Sciences Boltzmanngasse 3 ViennaA-1090 Austria Centre for Quantum Computation & Communication Technology Department of Physics University of Queensland St LuciaQLD4072 Australia European Space Agency Keplerlaan 1 - P.O. Box 299 AG Noordwijk ZH2200 Netherlands Department of Electrical and Electronic Engineering University of Bristol Merchant Venturers Building Woodland Road BristolBS8 1UB United Kingdom German Aerospace Center Institute of Communications and Navigation Muenchner Strasse 20 Wessling82234 Germany Institute for Quantum Computing Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Institute for Quantum Computing Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Precision Engineering Department Fraunhofer IOF Albert-Einstein-Straße 7 Jena07745 Germany Physics department Stockholm University Albanova universitetscentrum Universitetsvägen 10 Stockholm114 18 Sweden York Centre for Quantum Technologies Department of Physics University of York HeslingtonYO10 5DD United Kingdom University of Seville SevillaE-41012 Spain iTEAM Research Institute Universitat Politcnica de Valencia Valencia46022 Spain 4-2-1 Nukui-Kitamachi Koganei Tokyo184-8795 Japan CNRS Universite Pierre et Marie Curie Paris75005 France Department of Optics Faculty of Science Palacky University 17. Iistopadu 12 Olomouc772 00 Czech Republic Max Planck Institute for the Science of Light Bldg. 24 Günther-Scharowsky Str. 1 ErlangenD-91058 Germany Piazza Leonardo da Vinci 32 Milano20133 Italy School of Engineering University of Glasgow GlasgowG12 8LT United Kingdom Vienna Center of Quantum Science and Technology Faculty of Physics University of Vienna Boltzmanngasse 5 ViennaA-1090 Austria NASA Goddard Space Flight Center GreenbeltMD20771 United States Center for Quantum Information and Quantum Con

Models of quantum systems on curved space-times lack sufficient experimental verification. Some speculative theories suggest that quantum properties, such as entanglement, may exhibit entirely different behavior to purely classical systems. By measuring this effect or lack thereof, we can test the hypotheses behind several such models. For instance, as predicted by Ralph and coworkers [T C Ralph, G J Milburn, and T Downes, Phys. Rev. A, 79(2):22121, 2009;T C Ralph and J Pienaar, New Journal of Physics, 16(8):85008, 2014], a bipartite entangled system could decohere if each particle traversed through a different gravitational field gradient. We propose to study this effect in a ground to space uplink scenario. We extend the above theoretical predictions of Ralph and coworkers and discuss the scientific consequences of detecting/failing to detect the predicted gravitational decoherence. We present a detailed mission design of the European Space Agency's (ESA) Space QUEST (Space - Quantum Entanglement Space Test) mission, and study the feasibility of the mission scheme. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum entanglement

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Multi scale color coding of derived curvature and torsion fields on a multi-block curvilinear grid 22

Multi scale color coding of derived curvature and torsion fi...

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22nd International Conference in Central Europe on computer Graphics, Visualization and computer Vision, WSCG 2014 - in co-operation with EUROGRAPHICS Association

作者： Brener, Nathan Harhad, Farid Karki, Bijaya Benger, Werner Acharya, Sumanta Ritter, Marcel Iyengar, S. Sitharama Department of Computer Science Louisiana State University Baton Rouge70808 United States Center for Computation and Technology Louisiana State University Baton RougeLA70808 United States Department of Mechanical Engineering Louisiana State University Baton RougeLA70808 United States Institute for Astro-and Particle Physics University of Innsbruck Technikerstrasse 25/8 InnsbruckA-6020 Austria School of Computing and Info. Sciences Florida International University MiamiFL33199 United States

ISBN: (纸本)9788086943718

We present a method to compute and visualize the curvature and torsion scalar fields derived from a vector field defined on a multi-block curvilinear grid. In order to compute the curvature and torsion fields, we define a uniform Cartesian grid of points in the volume occupied by the curvilinear grid and interpolate from the curvilinear grid to the Cartesian grid to get the vector field at the Cartesian grid points. We can then use finite difference formulas to numerically compute the derivatives needed in the curvature and torsion formulas. Once the curvature and torsion have been computed at the Cartesian grid points, we employ a multi scale color coding technique to visualize these scalar fields in orthoslices of the Cartesian grid. This multi scale technique allows one to observe the entire range of values of the scalar field, including small, medium and large values. In contrast, if uniform color coding is used to visualize curvature and torsion fields, it sometimes shows most of the values in a single predominant color, which makes it impossible to distinguish between the small, medium and large values. As an example of this multi-scale technique, we displayed the curvature and torsion fields in a computational fluid dynamics (CFD) simulation of an industrial stirred tank and used these images to identify regions of low, medium and high fluid mixing in the tank.

关键词： computational fluid dynamics

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Robust Traceability from Trace Amounts

Robust Traceability from Trace Amounts

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Annual IEEE Symposium on Foundations of computer science

作者： Cynthia Dwork Adam Smith Thomas Steinke Jonathan Ullman Salil Vadhan Microsoft. Mountain View CA USA Computer Science and Engineering Department. Pennsylvania State University. State College PA USA John A. Paulson School of Engineering and Applied Sciences. Harvard University. Cambridge MA USA College of Computer and Information Science. Northeastern University. Boston MA USA Center for Research on Computation & Society Harvard University Cambridge MA USA

The privacy risks inherent in the release of a large number of summary statistics were illustrated by Homer et al. (PLoS Genetics, 2008), who considered the case of 1-way marginals of SNP allele frequencies obtained in a genome-wide association study: Given a large number of minor allele frequencies from a case group of individuals diagnosed with a particular disease, together with the genomic data of a single target individual and statistics from a sizable reference dataset independently drawn from the same population, an attacker can determine with high confidence whether or not the target is in the case group. In this work we describe and analyze a simple attack that succeeds even if the summary statistics are significantly distorted, whether due to measurement error or noise intentionally introduced to protect privacy. Our attack only requires that the vector of distorted summary statistics is close to the vector of true marginals in ℓ 1 norm. Moreover, the reference pool required by previous attacks can be replaced by a single sample drawn from the underlying population. The new attack, which is not specific to genomics and which handles Gaussian as well as Bernouilli data, significantly generalizes recent lower bounds on the noise needed to ensure differential privacy (Bun, Ullman, and Vadhan, STOC 2014, Steinke and Ullman, 2015), obviating the need for the attacker to control the exact distribution of the data.

关键词： Sociology Statistics Privacy Genomics Bioinformatics Data privacy computer science

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Concurrent, parallel garbage collection in linear time 14

Concurrent, parallel garbage collection in linear time

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2014 ACM SIGPLAN International Symposium on Memory Management, ISMM 2014

作者： Brandt, Steven R. Krishnan, Hari Sharma, Gokarna Busch, Costas Center for Computation and Technology School of Electrical Engineering and Computer Science Louisiana State University Baton RougeLA70803 United States School of Electrical Engineering and Computer Science Louisiana State University Baton RougeLA70803 United States

ISBN: (纸本)9781450329217

This paper presents a new concurrent garbage collection algorithm based on two types of reference, strong and weak, to link the graph of objects. Strong references connect the roots to all the nodes in the graph but do not contain *** references may, however, contain cycles. Advantages of this system include: (1) reduced processing, nontrivial garbage collection work is only required when the last strong reference is lost;(2) fewer memory traces to delete objects, a garbage cycle only needs to be traversed twice to be deleted;(3) fewer memory traces to retain objects, since the collector can often prove objects are reachable without fully tracing support cycles to which the objects belong;(4) concurrency, it can run in parallel with a live system without "stopping the world;" (5) parallel, because collection operations in different parts of the memory can proceed at the same time. Previous variants of this technique required exponential cleanup time [27, 31], but our algorithm is linear in total time, i.e. any changes in the graph take only O(N) time steps, where N is the number of edges in the affected subgraph (e.g. the subgraph whose strong support is affected by the operations). Copyright © 2014 ACM.

关键词： Parallel programming

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Causal analysis of cortical networks involved in reaching to spatial targets

Causal analysis of cortical networks involved in reaching to...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： John R. Iversen Alejandro Ojeda Tim Mullen Markus Plank Joseph Snider Gert Cauwenberghs Howard Poizner Institute of Neural Computation and Swartz Center for Computational Neuroscience UC San Diego Department of Electrical and Computer Engineering UC San Diego Department of Cognitive Science and Institute of Neural Computation UC San Diego Brain Products Inc. Institute of Neural Computation UC San Diego Department of Bioengineering Jacobs School of Engineering and Institute of Neural Computation UC San Diego

ISBN: (纸本)9781424479276

The planning of goal-directed movement towards targets in different parts of space is an important function of the brain. Such visuo-motor planning and execution is known to involve multiple brain regions, including visual, parietal, and frontal cortices. To understand how these brain regions work together to both plan and execute goal-directed movement, it is essential to describe the dynamic causal interactions among them. Here we model causal interactions of distributed cortical source activity derived from non-invasively recorded EEG, using a combination of ICA, minimum-norm distributed source localization (cLORETA), and dynamical modeling within the Source Information Flow Toolbox (SIFT). We differentiate network causal connectivity of reach planning and execution, by comparing the causal network in a speeded reaching task with that for a control task not requiring goal-directed movement. Analysis of a pilot dataset (n=5) shows the utility of this technique and reveals increased connectivity between visual, motor and frontal brain regions during reach planning, together with decreased cross-hemisphere visual coupling during planning and execution, possibly related to task demands.

关键词： Planning Electroencephalography Brain modeling Visualization Biological system modeling Neuroscience Independent component analysis

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Enhanced directional transmission through a subwavelength plasmonic slit by optical microcavities

Enhanced directional transmission through a subwavelength pl...

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Frontiers in Optics

作者： Haddadpour, Ali Veronis, Georgios School of Electrical Engineering and Computer Science Louisiana State University Baton RougeLA70803 United States Center for Computation and Technology Louisiana State University Baton RougeLA70803 United States

We show that a compact structure consisting of multiple optical microcavities on both the entrance and exit side of a subwavelength plasmonic slit can lead to greatly enhanced directional transmission through the slit... 详细信息

ISBN: (纸本)1557522863

关键词： Plasmonics

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Clutter reduction in rendering of particle (Atom) trajectories with adaptive position merging

Clutter reduction in rendering of particle (Atom) trajectori...

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9th International Conference on computer Graphics Theory and Applications, GRAPP 2014

作者： Bohara, Bidur Karki, Bijaya B. School of Electrical Engineering and Computer Science Louisiana State University Baton Rouge United States Department of Geology and Geophysics Louisiana State University Baton Rouge United States Center for Computation and Technology Louisiana State University Baton Rouge United States

ISBN: (纸本)9789897580024

Visualization of position-time series data from molecular dynamics simulations of a material has to render atomic trajectories, and relevant structural and dynamical information. Clutter/occlusion associated with overlapping trajectories becomes serious even for moderate data sizes. We present an adaptive hierarchical scheme for merging multiple positions along trajectories to significantly reduce the number of points/line segments used for rendering. Our approach finds positions lying within a space window (cut-off distance) from a reference position and merges them into a single position. The window is then moved in time order with merging performed at each successive location. All original positions are thus processed to a reduced number of new (merged) positions, which are further merged with the same or a different cut-off to obtain even fewer positions. This hierarchical merging may continue several levels deep. Moreover, merging can be performed subject to constraint of information, which is displayed (color-coded) along individual trajectories. Both the trajectory geometry and underlying atomic structure become increasingly visible after merging so the nature and extent of atomic arrangements and movements can be better assessed.

关键词： Visualization

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Hybrid Frequency and Phase Coding for a High-Speed SSVEP-Based BCI Speller

Hybrid Frequency and Phase Coding for a High-Speed SSVEP-Bas...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Xiaogang Chen Yijun Wang Masaki Nakanishi Tzyy-Ping Jung Xiaorong Gao Department of Biomedical Engineering School of Medicine Tsinghua University Swartz Center for Computational Neuroscience Institute for Neural Computation University of California Graduate School of Science and Technology Keio University

ISBN: (纸本)9781424479276

Steady-state visual evoked potential (SSVEP)-based brain-computer interfaces (BCIs) have potential to realize high-speed communication between the human brain and the external environment. Recently, multiple access (MA) methods in telecommunications have been introduced into the system design of BCIs and showed their potential in improving BCI performance. This study investigated the feasibility of hybrid frequency and phase coding methods in multi-target SSVEP-based BCIs. Specifically, this study compared two hybrid target-coding strategies: (1) mixed frequency and phase coding, and (2) joint frequency and phase coding. In a simulated online BCI experiment using a 40-target BCI speller, BCI performance for both coding approaches were tested with a group of six subjects. At a spelling speed of 40 characters per minute (1.5 seconds per character), both approaches obtained high information transfer rates (ITR) (mixed coding: 172.37±28.67 bits/min, joint coding: 170.94±28.32 bits/min) across subjects. There was no statistically significant difference between the two approaches (p>0.05). These results suggest that the hybrid frequency and phase coding methods are highly efficient for multi-target coding in SSVEP BCIs with a large number of classes, providing a practical solution to implement a high-speed BCI speller.

关键词： Encoding Joints Visualization Training Accuracy Brain-computer interfaces Monitoring

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Multisensory Interface for 5D Stem Cell Image Volumes

Multisensory Interface for 5D Stem Cell Image Volumes

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Michael Koerner Eric Wait Mark Winter Chris Bjornsson Erzsebet Kokovay Yue Wang Susan K. Goderie Sally Temple Andrew R. Cohen School of Biomedical Engineering Science and Health Systems Drexel University Dept. of Electrical and Computer Engineering Drexel University Neural Stem Cell Institute UT Health Science Center

ISBN: (纸本)9781424479276

Biological imaging of live cell and tissue using 3D microscopy is able to capture time-lapse image sequences showing multiple molecular markers labeling different biological structures simultaneously. In order to analyze this complex multi-dimensional image sequence data, there is a need for automated quantitative algorithms, and for methods to visualize and interact with both the data and the analytical results. Traditional computational human input devices such as the keyboard and mouse are no longer adequate for complex tasks such as manipulating and navigating 3+ dimensional volumes. In this paper, we have developed a new interaction system for interfacing with big data sets using the human visual system together with touch, force and audio feedback. This system includes real-time dynamic 3D visualization, haptic interaction via exoskeletal glove, and tonal auditory components that seamlessly create an immersive environment for efficient qualitative analysis.

关键词： Haptic interfaces Stem cells Thumb Three-dimensional displays Data visualization

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LDA topic model with soft assignment of descriptors to words

LDA topic model with soft assignment of descriptors to words

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30th International Conference on Machine Learning, ICML 2013

作者： Weinshall, Daphna Hanukaev, Dmitri Levi, Gal School of Computer Science and Engineering Center for Neural Computation Hebrew University of Jerusalem Jerusalem 91904 Israel

ISBN: (纸本)9781629933061

The LDA topic model is being used to model corpora of documents that can be represented by bags of words. Here we extend the LDA model to deal with documents that are represented by bags of continuous descriptors. Given a finite dictionary of words, our extended LDA model allows for the soft assignment of descriptors to (many) dictionary words. We derive variational inference and parameter estimation procedures for the extended model, which closely resemble those obtained for the original model, with two important differences: First, the histogram of word counts is replaced by a histogram of pseudo word counts, or sums of responsibilities over all descriptors. Second, parameter estimation now depends on the average covariance matrix between these pseudocounts, reflecting the fact that with soft assignment words are not independent. We use this approach to address the detection of novel video events, where we seek to identify video events with low posterior probability. Using a benchmark dataset for novelty detection, we show a very significant improvement in the detection of novel events when using our extended LDA model with soft assignment to words as against hard assignment (the original model), achieving state of the art novelty detection results. Copyright 2013 by the author(s).

关键词： Parameter estimation

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