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arXiv 2017年

作者： McClean, Jarrod R. Sung, Kevin J. Kivlichan, Ian D. Cao, Yudong Dai, Chengyu Schuyler Fried, E. Gidney, Craig Gimby, Brendan Gokhale, Pranav Häner, Thomas Hardikar, Tarini Havlíček, Vojtěch Higgott, Oscar Huang, Cupjin Izaac, Josh Jiang, Zhang Liu, Xinle McArdle, Sam Neeley, Matthew O'Brien, Thomas O'Gorman, Bryan Ozfidan, Isil Radin, Maxwell D. Romero, Jhonathan Rubin, Nicholas Sawaya, Nicolas P.D. Setia, Kanav Sim, Sukin Steiger, Damian S. Steudtner, Mark Sun, Qiming Sun, Wei Wang, Daochen Zhang, Fang Babbush, Ryan Google Inc. VeniceCA90291 United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Department of Physics Harvard University CambridgeMA02138 United States Department of Chemistry and Chemical Biology Harvard University CambridgeMA02138 United States Zapata Computing Inc. Cambridge02138 United States Department of Physics University of Michigan Ann ArborMI48109 United States Rigetti Computing BerkeleyCA94710 United States Google Inc. Santa BarbaraCA93117 Department of Computer Science University of Chicago ChicagoIL60637 United States Theoretische Physik ETH Zurich Zurich8093 Switzerland Department of Physics Dartmouth College HanoverNH03755 United States Department of Computer Science Oxford University OxfordOX1 3QD United Kingdom Department of Physics and Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom Xanadu 372 Richmond St W TorontoM5V 1X6 Canada QuAIL NASA Ames Research Center Moffett FieldCA94035 Google Inc. Mountain ViewCA94043 United States Department of Materials University of Oxford Parks Road OxfordOX1 3PH United Kingdom Instituut-Lorentz Universiteit Leiden Leiden2300 RA Netherlands BQIC University of California BerkeleyCA94720 United States D-Wave Systems Inc. BurnabyBC Canada Materials Department University of California Santa Barbara Santa BarbaraCA93106 United States QuTech Delft University of Technology Lorentzweg 1 Delft2628 CJ Netherlands Division of Chemistry and Chemical Engineering California Institute of Technology PasadenaCA91125 United States Joint Center for Quantum Information and Computer Science University of Maryland College ParkMD20742 United States

Quantum simulation of chemistry and materials is predicted to be an important application for both near-term and fault-tolerant quantum devices. However, at present, developing and studying algorithms for these problems can be difficult due to the prohibitive amount of domain knowledge required in both the area of chemistry and quantum algorithms. To help bridge this gap and open the field to more researchers, we have developed the OpenFermion software package (***). OpenFermion is an open-source software library written largely in Python under an Apache 2.0 license, aimed at enabling the simulation of fermionic and bosonic models and quantum chemistry problems on quantum hardware. Beginning with an interface to common electronic structure packages, it simplifies the translation between a molecular specification and a quantum circuit for solving or studying the electronic structure problem on a quantum computer, minimizing the amount of domain expertise required to enter the field. The package is designed to be extensible and robust, maintaining high software standards in documentation and testing. This release paper outlines the key motivations behind design choices in OpenFermion and discusses some basic OpenFermion functionality which we believe will aid the community in the development of better quantum algorithms and tools for this exciting area of research. Copyright © 2017, The Authors. All rights reserved.

关键词： Electronic structure

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On Achievable Rate of Two-Way Relaying Cognitive Radio with Space Alignment

On Achievable Rate of Two-Way Relaying Cognitive Radio with ...

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IEEE International Conference on Communications

作者： Lokman Sboui Hakim Ghazzai Zouheir Rezki Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

We study a multiple-antenna two-way relaying (TWR) spectrum sharing system. A space alignment (SA) technique is adopted by the secondary users (SU's) to avoid interference with the primary users (PU's). We derive the optimal power allocation that maximizes the TWR achievable sum-rate of the SU while respecting the total power budget and the relay power constraints. In the numerical results, we quantify the sum-rate gain of using the SA in the TWR CR and we show that the SU sum-rate is very limited when the relay power is low or the PU's power and its resulting interference is high.

关键词： Relays Interference Cognitive radio Antennas MIMO Resource management Noise

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Analytical calculation of electromagnetic fields near parallel power planes with decoupling capacitors for RF interference estimation

Analytical calculation of electromagnetic fields near parall...

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electrical Design of Advanced Packaging and Systems Symposium, EDAPS

作者： Sangyeong Jeong Jingook Kim Booho Jung Kichul Hong Hyungsoo Kim Yun-Saing Kim Electrical and Computer Engineering Ulsan National Institute of Science and Technology Ulsan South Korea DRAM Development Division SK Hynix Icheon Korea

An analytical method to calculate the electric- and magnetic fields near a planar PDN with decoupling capacitors has been proposed. Magnetic current source along the plane edges with multiple decoupling capacitors is calculated using the cavity resonant model. The electric- and magnetic fields in the near field region calculated from the magnetic currents are validated with the results obtained using PEEC method.

关键词： Magnetic fields Capacitors Electric fields Impedance Integrated circuit modeling Cavity resonators

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Spectrum sharing opportunities of full-duplex systems using improper Gaussian signaling

Spectrum sharing opportunities of full-duplex systems using ...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Mohamed Gaafar Osama Amin Walid Abediseid Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

Sharing the licensed spectrum of full-duplex (FD) primary users (PU) brings strict limitations on the underlay cognitive radio operation. Particularly, the self interference may overwhelm the PU receiver and limit the opportunity of secondary users (SU) to access the spectrum. Improper Gaussian signaling (IGS) has demonstrated its superiority in improving the performance of interference channel systems. Throughout this paper, we assume a FD PU pair that uses proper Gaussian signaling (PGS), and a half-duplex SU pair that uses IGS. The objective is to maximize the SU instantaneous achievable rate while meeting the PU quality-of-service. To this end, we propose a simplified algorithm that optimizes the SU signal parameters, i.e, the transmit power and the circularity coefficient, which is a measure of the degree of impropriety of the SU signal, to achieve the design objective. Numerical results show the merits of adopting IGS compared with PGS for the SU especially with the existence of week PU direct channels and/or strong SU interference channels.

关键词： Receivers Quality of service Interference channels Signal to noise ratio Land mobile radio Random variables

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On the Ergodic Capacity of Dual-Branch Correlated Log-Normal Fading Channels with Applications

On the Ergodic Capacity of Dual-Branch Correlated Log-Normal...

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IEEE Vehicular Technology Conference

作者： Hessa AlQuwaiee Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Makkah Province Kingdom of Saudi Arabia

Closed-form expressions of the ergodic capacity of independent or correlated diversity branches over Log-Normal fading channels are not available in the literature. Thus, it is become of an interest to investigate the behavior of such metric at high signal-to-noise (SNR). In this work, we propose simple closed-form asymptotic expressions of the ergodic capacity of dual-branch correlated Log-Normal corresponding to selection combining, and switch-and-stay combining. Furthermore, we capitalize on these new results to find new asymptotic ergodic capacity of correlated dual-branch free-space optical communication system under the impact of pointing error with both heterodyne and intensity modulation/direct detection.

关键词： Signal to noise ratio Diversity reception Fading Switches Adaptive optics Approximation methods Atmospheric modeling

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K*(892)0 and ϕ(1020) production at midrapidity in pp collisions at s=8 TeV

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physical Review C 2020年第2期102卷 024912-024912页

作者： S. Acharya D. Adamová S. P. Adhya A. Adler J. Adolfsson M. M. Aggarwal G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. Ahmad S. U. Ahn A. Akindinov M. Al-Turany S. N. Alam D. S. D. Albuquerque D. Aleksandrov B. Alessandro H. M. Alfanda R. Alfaro Molina B. Ali Y. Ali A. Alici A. Alkin J. Alme T. Alt L. Altenkamper I. Altsybeev M. N. Anaam C. Andrei D. Andreou H. A. Andrews A. Andronic M. Angeletti V. Anguelov C. Anson T. Antičić F. Antinori P. Antonioli R. Anwar N. Apadula L. Aphecetche H. Appelshäuser S. Arcelli R. Arnaldi M. Arratia I. C. Arsene M. Arslandok A. Augustinus R. Averbeck S. Aziz M. D. Azmi A. Badalà Y. W. Baek S. Bagnasco X. Bai R. Bailhache R. Bala A. Baldisseri M. Ball S. Balouza R. C. Baral R. Barbera L. Barioglio G. G. Barnaföldi L. S. Barnby V. Barret P. Bartalini K. Barth E. Bartsch F. Baruffaldi N. Bastid S. Basu G. Batigne B. Batyunya P. C. Batzing D. Bauri J. L. Bazo Alba I. G. Bearden C. Bedda N. K. Behera I. Belikov F. Bellini R. Bellwied V. Belyaev G. Bencedi S. Beole A. Bercuci Y. Berdnikov D. Berenyi R. A. Bertens D. Berzano M. G. Besoiu L. Betev A. Bhasin I. R. Bhat M. A. Bhat H. Bhatt B. Bhattacharjee A. Bianchi L. Bianchi N. Bianchi J. Bielčík J. Bielčíková A. Bilandzic G. Biro R. Biswas S. Biswas J. T. Blair D. Blau C. Blume G. Boca F. Bock A. Bogdanov L. Boldizsár A. Bolozdynya M. Bombara G. Bonomi H. Borel A. Borissov M. Borri H. Bossi E. Botta L. Bratrud P. Braun-Munzinger M. Bregant T. A. Broker M. Broz E. J. Brucken E. Bruna G. E. Bruno M. D. Buckland D. Budnikov H. Buesching S. Bufalino O. Bugnon P. Buhler P. Buncic Z. Buthelezi J. B. Butt J. T. Buxton S. A. Bysiak D. Caffarri A. Caliva E. Calvo Villar R. S. Camacho P. Camerini A. A. Capon F. Carnesecchi J. Castillo Castellanos A. J. Castro E. A. R. Casula F. Catalano C. Ceballos Sanchez P. Chakraborty S. Chandra B. Chang W. Chang S. Chapeland M. Chartier S. Chattopadhyay A. Chauvin C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato S. Cho P. Chochula T. Chowdhury P. Christakoglou C. H. Christensen P. Christia Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Nuclear Physics Institute of the Czech Academy of Sciences Řež u Prahy Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany Lund University Department of Physics Division of Particle Physics Lund Sweden Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi ” Rome Italy Indian Institute of Technology Bombay (IIT) Mumbai India INFN Sezione di Bologna Bologna Italy Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea NRC Kurchatov Institute - ITEP Moscow Russia Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany Universidade Estadual de Campinas (UNICAMP) Campinas Brazil National Research Centre Kurchatov Institute Moscow Russia INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico COMSATS University Islamabad Islamabad Pakistan Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Department of Physics and Technology University of Bergen Bergen Norway Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany St. Petersburg State University St. Petersburg Russia Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Westfälische Wilhelms-Universität Münster

The production of K*(892)0 and ϕ(1020) in pp collisions at s=8 TeV was measured by using Run 1 data collected by the ALICE collaboration at the CERN Large Hadron Collider (LHC). The pT-differential yields d2N/dydpT in... 详细信息

关键词： Nuclear reactions Nucleon induced nuclear reactions Quantum chromodynamics Quark-gluon plasma

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Ground-wave propagation characterization and prediction for HF cognitive radio

Ground-wave propagation characterization and prediction for ...

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MILCOM, Military Communications Conference

作者： Michael J. Conway Christopher J. Payne Sven G. Bilén Eric N. Koski School of Electrical Engineering and Computer Science The Pennsylvania State University University Park PA RF Communications Division Harris Corporation Rochester NY

ISBN: (纸本)9781509000746

Various high-frequency (HF) ground-wave propagation models are evaluated by comparing the models' path-loss estimates with field measurements. Multiple sources of ground conductivity and permittivity information and various methods for estimating terrain effects are employed, with the goal of approximating the measured path-loss values as accurately as possible. Estimates are obtained using the Rotheram-Millington spherical-Earth model as well as models that take the path's terrain profile into account, including a simple clearance angle model and more elaborate models estimating knife-edge diffraction loss using the methods of Bullington, Epstein-Peterson, and Deygout. Ground conductivity and permittivity values are obtained from standard ITU conductivity maps or directly measured at the transmit and receive locations. The Google Maps API is used to provide the terrain profile across each link. The resulting improvements in ground-wave path-loss estimation will contribute to more effective communications planning in HF radio networks, and to defining realistic scenarios for simulation studies of MANET protocols and cognitive radio techniques for use at HF.

关键词： Receivers Loss measurement Diffraction Probes Conductivity Propagation losses Correlation

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Kalman Filters for Dynamic and Secure Smart Grid State Estimation

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Intelligent Industrial Systems 2015年第1期1卷 29-36页

作者： Zhang, Jinghe Welch, Greg Ramakrishnan, Naren Rahman, Saifur Department of Computer Science Discovery Analytics Center Virginia Tech Arlington USA Institute for Simulation & Training and the Computer Science Division EECS The University of Central Florida Orlando USA Department of Electrical and Computer Engineering Virginia Tech - Advanced Research Institute Arlington USA

Combining dynamic state estimation methods such as Kalman filters with real-time data generated/collected by digital meters such as phasor measurement units (PMU) can lead to advanced techniques for improving the quality of monitoring and controllability in smart grids. Classic Kalman filters achieve optimal performance with ideal system models, which are usually hard to obtain in practice with unexpected disturbances, device failures, and malicious data attacks. In this work, we introduce and compare a novel method, viz. adaptive Kalman Filter with inflatable noise variances, against a variety of classic Kalman filters. Extensive simulation studies demonstrate the powerful ability of our proposed algorithm under suboptimal conditions such as wrong system modeling, sudden disturbance and bad data injection.

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Outage performance of cognitive radio systems with Improper Gaussian signaling

Outage performance of cognitive radio systems with Improper ...

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IEEE International Symposium on Information Theory

作者： Osama Amin Walid Abediseid Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

ISBN: (纸本)9781467377058

Improper Gaussian signaling has proved its ability to improve the achievable rate of the systems that suffer from interference compared with proper Gaussian signaling. In this paper, we first study impact of improper Gaussian signaling on the performance of the cognitive radio system by analyzing the outage probability of both the primary user (PU) and the secondary user (SU). We derive exact expression of the SU outage probability and upper and lower bounds for the PU outage probability. Then, we design the SU signal by adjusting its transmitted power and the circularity coefficient to minimize the SU outage probability while maintaining a certain PU quality-of-service. Finally, we evaluate the proposed bounds and adaptive algorithms by numerical results.

关键词： Upper bound Quality of service Interference Cognitive radio Random variables Receivers

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Optical slot antennas for enhancement of WSe2 spontaneous emission rate

Optical slot antennas for enhancement of WSe2 spontaneous em...

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Berkeley Symposium on Energy Efficient Electronic Systems (E3S)

作者： Kevin Messer Michael Eggleston Sujay B. Desai Seth A. Fortuna Surabhi Madhavapathy Peida Zhao Jun Xiao Xiang Zhang Ali Javey Ming C. Wu Eli Yablonovitch Electrical Engineering and Computer Science University of California Berkeley CA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA Nanoscale Science and Engineering Center University of California Berkeley CA

The spontaneous emission rate of light emitters has been shown to have strong dependence on their local electromagnetic environment 1 . Optical antennas exploit this effect and can be used to greatly increase the spontaneous emission rate of a coupled light emitter. There have been several demonstrations of this effect with promising results using dye molecules and Er 3+ ions 2,3 . It is predicted that spontaneous emission rate enhancements greater than 1000x can be achieved with optical antennas while maintaining greater than 50% optical efficiency 4 . Demonstration of large spontaneous emission enhancement of semiconductor light emitters could lead to low power, high efficiency, fast light sources useful for short-range optical communications. Transition metal dichalcogenides, such as WSe 2 , are promising candidates for the light emitter of such a nanoLED device because they are semiconductors that maintain good quantum efficiency even with a nanoscale dimension. In this work we demonstrate an optical slot antenna coupled to a monolayer of WSe 2 . Photoluminescence measurements show an increase of total light emission >700x when compared to WSe 2 that is not coupled to an antenna. We estimate a spontaneous emission rate enhancement of 318x is responsible for this huge increase in light emission.

关键词： Spontaneous emission Stimulated emission Slot antennas Photoluminescence Antenna measurements Light emitting diodes

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