1,740 research outputs found
A comparison of FPS-16 and GMD-1 MEASUREMENTS and methods for processing wind data. Phase II - Analysis of time variability of atmospheric parameters Final report
Comparison of FPS-16 and GMD-1 radar tracking and radiosonde measurements and methods for processing wind data - time variability of atmospheric parameter
Quantum social networks
We introduce a physical approach to social networks (SNs) in which each actor
is characterized by a yes-no test on a physical system. This allows us to
consider SNs beyond those originated by interactions based on pre-existing
properties, as in a classical SN (CSN). As an example of SNs beyond CSNs, we
introduce quantum SNs (QSNs) in which actor is characterized by a test of
whether or not the system is in a quantum state. We show that QSNs outperform
CSNs for a certain task and some graphs. We identify the simplest of these
graphs and show that graphs in which QSNs outperform CSNs are increasingly
frequent as the number of vertices increases. We also discuss more general SNs
and identify the simplest graphs in which QSNs cannot be outperformed.Comment: REVTeX4, 6 pages, 3 figure
Basic exclusivity graphs in quantum correlations
A fundamental problem is to understand why quantum theory only violates some
noncontextuality (NC) inequalities and identify the physical principles that
prevent higher-than-quantum violations. We prove that quantum theory only
violates those NC inequalities whose exclusivity graphs contain, as induced
subgraphs, odd cycles of length five or more, and/or their complements. In
addition, we show that odd cycles are the exclusivity graphs of a well-known
family of NC inequalities and that there is also a family of NC inequalities
whose exclusivity graphs are the complements of odd cycles. We characterize the
maximum noncontextual and quantum values of these inequalities, and provide
evidence supporting the conjecture that the maximum quantum violation of these
inequalities is exactly singled out by the exclusivity principle.Comment: REVTeX4, 7 pages, 2 figure
Data analysis and archival
The purpose of this task is the acquisition, distribution, archival, and analysis of data collected during and in support of the Upper Atmospheric Research Program (UARP) field experiments. Meteorological and U2 data from the 1984 Stratosphere-Troposphere Exchange Project (STEP) was analyzed to determine characteristics of internal atmospheric waves. CDROM's containing data from the 1987 STEP, 1987 Airborne Antarctic Ozone Expedition (AAOE), and the 1989 Airborne Arctic Stratospheric Expedition (AASE) were produced for archival and distribution of those data sets. The AASE CDROM contains preliminary data and a final release is planned for February 1990. Comparisons of data from the NASA ER-2 Meteorological Measurement System (MMS) with radar tracking and radiosonde data show good agreement. Planning for a Meteorological Support Facility continues. We are investigating existing and proposed hardware and software to receive, manipulate, and display satellite imagery and standard meteorological analyses, forecasts, and radiosonde data
Algorithms for geodesics
Algorithms for the computation of geodesics on an ellipsoid of revolution are
given. These provide accurate, robust, and fast solutions to the direct and
inverse geodesic problems and they allow differential and integral properties
of geodesics to be computed.Comment: LaTex, 12 pages, 8 figures. Version 2 corrects some errors and adds
numerical examples. Supplementary material is available at
http://geographiclib.sourceforge.net/geod.htm
Experimental fully contextual correlations
Quantum correlations are contextual yet, in general, nothing prevents the
existence of even more contextual correlations. We identify and test a
noncontextuality inequality in which the quantum violation cannot be improved
by any hypothetical postquantum theory, and use it to experimentally obtain
correlations in which the fraction of noncontextual correlations is less than
0.06. Our correlations are experimentally generated from the results of
sequential compatible tests on a four-state quantum system encoded in the
polarization and path of a single photon.Comment: REVTeX4, 6 pages, 3 figure
Graph states in phase space
The phase space for a system of qubits is a discrete grid of points, whose axes are labeled in terms of the elements of the
finite field \Gal{2^n} to endow it with proper geometrical properties. We
analyze the representation of graph states in that phase space, showing that
these states can be identified with a class of non-singular curves. We provide
an algebraic representation of the most relevant quantum operations acting on
these states and discuss the advantages of this approach.Comment: 14 pages. 2 figures. Published in Journal of Physics
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