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arXiv 2020年

作者： Alkhatib, I. Amaral, D.W.P. Aralis, T. Aramaki, T. Arnquist, I.J. Ataee Langroudy, I. Azadbakht, E. Banik, S. Barker, D. Bathurst, C. Bauer, D.A. Bezerra, L.V.S. Bhattacharyya, R. Bowles, M.A. Brink, P.L. Bunker, R. Cabrera, B. Calkins, R. Cameron, R.A. Cartaro, C. Cerdeño, D.G. Chang, Y.-Y. Chaudhuri, M. Chen, R. Chott, N. Cooley, J. Coombes, H. Corbett, J. Cushman, P. de Brienne, F. di Vacri, M.L. Diamond, M.D. Fascione, E. Figueroa-Feliciano, E. Fink, C.W. Fouts, K. Fritts, M. Gerbier, G. Germond, R. Ghaith, M. Golwala, S.R. Harris, H.R. Hines, B.A. Hollister, M.I. Hong, Z. Hoppe, E.W. Hsu, L. Huber, M.E. Iyer, V. Jardin, D. Jastram, A. Kashyap, V.K.S. Kelsey, M.H. Kubik, A. Kurinsky, N.A. Lawrence, R.E. Li, A. Loer, B. Lopez Asamar, E. Lukens, P. MacFarlane, D.B. Mahapatra, R. Mandic, V. Mast, N. Mayer, A.J. Meyer zu Theenhausen, H. Michaud, É.M. Michielin, E. Mirabolfathi, N. Mohanty, B. Morales Mendoza, J.D. Nagorny, S. Nelson, J. Neog, H. Novati, V. Orrell, J.L. Oser, S.M. Page, W.A. Partridge, R. Podviianiuk, R. Ponce, F. Poudel, S. Pradeep, A. Pyle, M. Rau, W. Reid, E. Ren, R. Reynolds, T. Roberts, A. Robinson, A.E. Saab, T. Sadoulet, B. Sander, J. Sattari, A. Schnee, R.W. Scorza, S. Serfass, B. Sincavage, D.J. Stanford, C. Street, J. Toback, D. Underwood, R. Verma, S. Villano, A.N. von Krosigk, B. Watkins, S.L. Wilson, J.S. Wilson, M.J. Winchell, J. Wright, D.H. Yellin, S. Young, B.A. Yu, T.C. Zhang, E. Zhang, H.G. Zhao, X. Zheng, L. Department of Physics University of Toronto TorontoONM5S 1A7 Canada Department of Physics Durham University DurhamDH1 3LE United Kingdom Division of Physics Mathematics & Astronomy California Institute of Technology PasadenaCA91125 United States SLAC National Accelerator Laboratory Kavli Institute for Particle Astrophysics and Cosmology Menlo ParkCA94025 United States Pacific Northwest National Laboratory RichlandWA99352 United States Department of Physics and Astronomy The Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University College StationTX77843 United States School of Physical Sciences National Institute of Science Education and Research HBNI Jatni752050 India School of Physics & Astronomy University of Minnesota MinneapolisMN55455 United States Department of Physics University of Florida GainesvilleFL32611 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Department of Physics & Astronomy University of British Columbia VancouverBCV6T 1Z1 Canada TRIUMF VancouverBCV6T 2A3 Canada Department of Physics South Dakota School of Mines and Technology Rapid CitySD57701 United States Department of Physics Stanford University StanfordCA94305 United States Department of Physics Southern Methodist University DallasTX75275 United States Instituto de Física Teórica UAM/CSIC Universidad Autónoma de Madrid Madrid28049 Spain Department of Physics & Astronomy Northwestern University EvanstonIL60208-3112 United States Department of Physics Queen's University KingstonONK7L 3N6 Canada Département de Physique Université de Montréal MontréalQCH3C 3J7 Canada Department of Physics University of California BerkeleyCA94720 United States Department of Electrical and Computer Engineering Texas A&M University College StationTX77843 United States Department of Physics University of Colorado Denver DenverCO80217 United States Department of Electrical Engineering University of Col

The Cryogenic Dark Matter Search low ionization threshold experiment (CDMSlite) achieved efficient detection of very small recoil energies in its germanium target, resulting in sensitivity to Lightly Ionizing Particles (LIPs) in a previously unexplored region of charge, mass, and velocity parameter space. We report first direct-detection limits calculated using the optimum interval method on the vertical intensity of cosmogenically-produced LIPs with an electric charge smaller than e/(3 × 105), as well as the strongest limits for charge ≤ e/160, with a minimum vertical intensity of 1.36 × 10−7 cm−2s−1sr−1 at charge e/160. These results apply over a wide range of LIP masses (5 MeV/c2 to 100 TeV/c2) and cover a wide range of βγ values (0.1 - 106), thus excluding non-relativistic LIPs with βγ as small as 0.1 for the first time. © 2020, CC BY.

关键词： Galaxies

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Constraints on low-mass, relic dark matter candidates from a surface-operated SuperCDMS single-charge sensitive detector

arXiv

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arXiv 2020年

作者： Amaral, D.W. Aralis, T. Aramaki, T. Arnquist, I.J. Azadbakht, E. Banik, S. Barker, D. Bathurst, C. Bauer, D.A. Bezerra, L.V.S. Bhattacharyya, R. Binder, T. Bowles, M.A. Brink, P.L. Bunker, R. Cabrera, B. Calkins, R. Cameron, R.A. Cartaro, C. Cerdeño, D.G. Chang, Y.-Y. Chen, R. Chott, N. Cooley, J. Coombes, H. Corbett, J. Cushman, P. de Brienne, F. di Vacri, M.L. Diamond, M.D. Fascione, E. Figueroa-Feliciano, E. Fink, C.W. Fouts, K. Fritts, M. Gerbier, G. Germond, R. Ghaith, M. Golwala, S.R. Harris, H.R. Herbert, N. Hines, B.A. Hollister, M.I. Hong, Z. Hoppe, E.W. Hsu, L. Huber, M.E. Iyer, V. Jardin, D. Jastram, A. Kelsey, M.H. Kubik, A. Kurinsky, N.A. Lawrence, R.E. Li, A. Loer, B. Asamar, E. Lopez Lukens, P. MacDonell, D. MacFarlane, D.B. Mahapatra, R. Mandic, V. Mast, N. Mayer, A.J. Michaud, É.M. Michielin, E. Mirabolfathi, N. Mohanty, B. Mendoza, J.D. Morales Nagorny, S. Nelson, J. Neog, H. Novati, V. Orrell, J.L. Oser, S.M. Page, W.A. Pakarha, P. Partridge, R. Podviianiuk, R. Ponce, F. Poudel, S. Pyle, M. Rau, W. Reid, E. Ren, R. Reynolds, T. Roberts, A. Robinson, A.E. Rogers, H.E. Saab, T. Sadoulet, B. Sander, J. Sattari, A. Schnee, R.W. Scorza, S. Serfass, B. Sincavage, D.J. Stanford, C. Stein, M. Street, J. Toback, D. Underwood, R. Verma, S. Villano, A.N. von Krosigk, B. Watkins, S.L. Wills, L. Wilson, J.S. Wilson, Matthew J. Winchell, J. Wright, D.H. Yellin, S. Young, B.A. Yu, T.C. Zhang, E. Zhang, H.G. Zhao, X. Zheng, L. Department of Physics Durham University DurhamDH1 3LE United Kingdom Division of Physics Mathematics & Astronomy California Institute of Technology PasadenaCA91125 United States SLAC National Accelerator Laboratory Kavli Institute for Particle Astrophysics and Cosmology Menlo ParkCA94025 United States Pacific Northwest National Laboratory RichlandWA99352 United States Department of Physics and Astronomy The Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University College StationTX77843 United States School of Physical Sciences National Institute of Science Education and Research HBNI Jatni752050 India School of Physics & Astronomy University of Minnesota MinneapolisMN55455 United States Department of Physics University of Florida GainesvilleFL32611 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Department of Physics & Astronomy University of British Columbia VancouverBCV6T 1Z1 Canada TRIUMF VancouverBCV6T 2A3 Canada Department of Physics University of South Dakota VermillionSD57069 United States Department of Physics South Dakota School of Mines and Technology Rapid CitySD57701 United States Department of Physics Stanford University StanfordCA94305 United States Department of Physics Southern Methodist University DallasTX75275 United States Instituto de Física Teórica UAM/CSIC Universidad Autónoma de Madrid Madrid28049 Spain Department of Physics & Astronomy Northwestern University EvanstonIL60208-3112 United States Department of Physics Queen's University KingstonONK7L 3N6 Canada Département de Physique Université de Montréal MontréalQCH3C 3J7 Canada Department of Physics University of Toronto TorontoONM5S 1A7 Canada Department of Physics University of California BerkeleyCA94720 United States Department of Electrical and Computer Engineering Texas A&M University College StationTX77843 United States Department of Physics University of Colorado Denver

This article presents an analysis and the resulting limits on light dark matter inelastically scattering off of electrons, and on dark photon and axion-like particle absorption, using a second-generation SuperCDMS high-voltage eV-resolution detector. The 0.93 gram Si detector achieved a 3 eV phonon energy resolution;for a detector bias of 100 V, this corresponds to a charge resolution of 3 % of a single electron-hole pair. The energy spectrum is reported from a blind analysis with 1.2 gram-days of exposure acquired in an above-ground laboratory. With charge carrier trapping and impact ionization effects incorporated into the dark matter signal models, the dark matter-electron cross section σ¯e is constrained for dark matter masses from 0.5-104 MeV/c2;in the mass range from 1.2-50 eV/c2 the dark photon kinetic mixing parameter Ε and the axioelectric coupling constant gae are constrained. The minimum 90 % confidence-level upper limits within the above mentioned mass ranges are σ¯e = 8.7 × 10−34 cm2, Ε = 3.3 × 10−14, and gae = 1.0 × 10−9 Copyright © 2020, The Authors. All rights reserved.

关键词： Impact ionization

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New Horizons: Scalar and Vector Ultralight Dark Matter

arXiv

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arXiv 2022年

作者： Antypas, D. Banerjee, A. Bartram, C. Baryakhtar, M. Betz, J. Bollinger, J.J. Boutan, C. Bowring, D. Budker, D. Carney, D. Carosi, G. Chaudhuri, S. Cheong, S. Chou, A. Chowdhury, M.D. Co, R.T. Crespo López-Urrutia, J.R. Demarteau, M. DePorzio, N. Derbin, A.V. Deshpande, T. Chowdhury, M.D. Di Luzio, L. Diaz-Morcillo, A. Doyle, J.M. Drlica-Wagner, A. Droster, A. Du, N. Döbrich, B. Eby, J. Essig, R. Farren, G.S. Figueroa, N.L. Fry, J.T. Gardner, S. Geraci, A.A. Ghalsasi, A. Ghosh, S. Giannotti, M. Gimeno, B. Griffin, S.M. Grin, D. Grin, D. Grote, H. Gundlach, J.H. Guzzetti, M. Hanneke, D. Harnik, R. Henning, R. Irsic, V. Jackson, H. Jackson Kimball, D.F. Jaeckel, J. Kagan, M. Kedar, D. Khatiwada, R. Knirck, S. Kolkowitz, S. Kovachy, T. Kuenstner, S.E. Lasner, Z. Leder, A.F. Lehnert, R. Leibrandt, D.R. Lentz, E. Lewis, S.M. Liu, Z. Manley, J. Maruyama, R.H. Millar, A.J. Muratova, V.N. Musoke, N. Nagaitsev, S. Noroozian, O. O'Hare, C.A.J. Ouellet, J.L. Pappas, K.M.W. Peik, E. Perez, G. Phipps, A. Rapidis, N.M. Robinson, J.M. Robles, V.H. Rogers, K.K. Rudolph, J. Rybka, G. Safdari, M. Safdari, M. Safronova, Marianna S. Salemi, C.P. Schmidt, P.O. Schumm, T. Schwartzman, A. Shu, J. Simanovskaia, M. Singh, J. Singh, S. Smith, M.S. Snow, W.M. Stadnik, Y.V. Sun, C. Sushkov, A.O. Tait, T.M.P. Takhistov, V. Tanner, D.B. Temples, D.J. Thirolf, P.G. Thomas, J.H. Tobar, M.E. Tretiak, O. Tsai, Y.-D. Tyson, J.A. Vandegar, M. Vermeulen, S. Visinelli, L. Vitagliano, E. Wang, Z. Wilson, D.J. Winslow, L. Withington, S. Wooten, M. Yang, J. Ye, J. Young, B.A. Yu, F. Zaheer, M.H. Zelevinsky, T. Zhao, Y. Zhou, K. Johannes Gutenberg University Mainz Mainz Germany Mainz Mainz Germany Department of Particle Physics and Astrophysics Weizmann Institute of Science Rehovot Israel University of Washington SeattleWA United States Department of Physics and Astronomy University of Delaware NewarkDE United States National Institute of Standards and Technology Boulder CO United States Pacific Northwest National Laboratory RichlandWA United States Fermi National Accelerator Laboratory BataviaIL United States University of California Berkeley BerkeleyCA United States Physics Division Lawrence Berkeley National Laboratory BerkeleyCA United States Lawrence Livermore National Laboratory LivermoreCA United States Princeton University Department of Physics Princeton NJ United States Fundamental Physics Directorate SLAC National Accelerator Laboratory Menlo ParkCA United States Physics Department Stanford University StanfordCA United States Wyant College of Optical Sciences University of Arizona TucsonAZ United States William I. Fine Theoretical Physics Institute School of Physics and Astronomy University of Minnesota MinneapolisMN United States Max-Planck-Institut für Kernphysik Heidelberg Germany Oak Ridge National Laboratory Oak RidgeTN United States Department of Physics Harvard University CambridgeMA United States Petersburg Nuclear Physics Institute NRC Kurchatov Institute St. Petersburg Russia Northwestern University Evanston IL United States Dipartimento di Fisica e Astronomia'G. Galilei' Università di Padova Padova Italy Istituto Nazionale Fisica Nucleare Sezione di Padova Padova Italy Department of Information and Communications Technologies Technical University of Cartagena Cartagena Spain Harvard-MIT Center for Ultracold Atoms CambridgeMA United States Kavli Institute for Cosmological Physics University of Chicago ChicagoIL United States University of Chicago ChicagoIL United States European Organization for Nuclear Research Geneva Switzerla

The last decade has seen unprecedented effort in dark matter model building at all mass scales coupled with the design of numerous new detection strategies. Transformative advances in quantum technologies have led to a plethora of new high-precision quantum sensors and dark matter detection strategies for ultralight ( Copyright © 2022, The Authors. All rights reserved.

关键词： Dark Matter

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Light dark matter search with a high-resolution athermal phonon detector operated above ground

arXiv

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arXiv 2020年

作者： Alkhatib, I. Amaral, D.W.P. Aralis, T. Aramaki, T. Arnquist, I.J. Ataee Langroudy, I. Azadbakht, E. Banik, S. Barker, D. Bathurst, C. Bauer, D.A. Bezerra, L.V.S. Bhattacharyya, R. Binder, T. Bowles, M.A. Brink, P.L. Bunker, R. Cabrera, B. Calkins, R. Cameron, R.A. Cartaro, C. Cerdeño, D.G. Chang, Y.-Y. Chaudhuri, M. Chen, R. Chott, N. Cooley, J. Coombes, H. Corbett, J. Cushman, P. De Brienne, F. di Vacri, M.L. Diamond, M.D. Fascione, E. Figueroa-Feliciano, E. Fink, C.W. Fouts, K. Fritts, M. Gerbier, G. Germond, R. Ghaith, M. Golwala, S.R. Harris, H.R. Herbert, N. Hines, B.A. Hollister, M.I. Hong, Z. Hoppe, E.W. Hsu, L. Huber, M.E. Iyer, V. Jardin, D. Jastram, A. Kashyap, V.K.S. Kelsey, M.H. Kubik, A. Kurinsky, N.A. Lawrence, R.E. Li, A. Loer, B. Lopez Asamar, E. Lukens, P. MacDonell, D. MacFarlane, D.B. Mahapatra, R. Mandic, V. Mast, N. Mayer, A.J. Meyer zu Theenhausen, H. Michaud, É.M. Michielin, E. Mirabolfathi, N. Mohanty, B. Morales Mendoza, J.D. Nagorny, S. Nelson, J. Neog, H. Novati, V. Orrell, J.L. Oser, S.M. Page, W.A. Pakarha, P. Partridge, R. Podviianiuk, R. Ponce, F. Poudel, S. Pyle, M. Rau, W. Reid, E. Ren, R. Reynolds, T. Roberts, A. Robinson, A.E. Saab, T. Sadoulet, B. Sander, J. Sattari, A. Schnee, R.W. Scorza, S. Serfass, B. Sincavage, D.J. Stanford, C. Street, J. Toback, D. Underwood, R. Verma, S. Villano, A.N. von Krosigk, B. Watkins, Samuel L. Wills, L. Wilson, J.S. Wilson, M.J. Winchell, J. Wright, D.H. Yellin, S. Young, B.A. Yu, T.C. Zhang, E. Zhang, H.G. Zhao, X. Zheng, L. Camilleri, J. Kolomensky, Yu.G. Zuber, S. Department of Physics University of Toronto TorontoONM5S 1A7 Canada Department of Physics Durham University DurhamDH1 3LE United Kingdom Division of Physics Mathematics & Astronomy California Institute of Technology PasadenaCA91125 United States SLAC National Accelerator Laboratory Kavli Institute for Particle Astrophysics and Cosmology Menlo ParkCA94025 United States Pacific Northwest National Laboratory RichlandWA99352 United States Department of Physics and Astronomy The Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University College StationTX77843 United States School of Physical Sciences National Institute of Science Education and Research HBNI Jatni752050 India School of Physics & Astronomy University of Minnesota MinneapolisMN55455 United States Department of Physics University of Florida GainesvilleFL32611 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Department of Physics & Astronomy University of British Columbia VancouverBCV6T 1Z1 Canada TRIUMF VancouverBCV6T 2A3 Canada Department of Physics University of South Dakota VermillionSD57069 United States Department of Physics South Dakota School of Mines and Technology Rapid CitySD57701 United States Department of Physics Stanford University StanfordCA94305 United States Department of Physics Southern Methodist University DallasTX75275 United States Instituto de Física Teórica UAM/CSIC Universidad Autónoma de Madrid Madrid28049 Spain Department of Physics & Astronomy Northwestern University EvanstonIL60208-3112 United States Department of Physics Queen's University KingstonONK7L 3N6 Canada Département de Physique Université de Montréal MontréalQCH3C 3J7 Canada Department of Physics University of California BerkeleyCA94720 United States Department of Electrical and Computer Engineering Texas A&M University College StationTX77843 United States Department of Physics University of Colorado Denver

We present limits on spin-independent dark matter-nucleon interactions using a 10.6 g Si athermal phonon detector with a baseline energy resolution of σE = 3.86 ± 0.04 (stat.)+0.19-0.00(syst.) eV. This exclusion analysis sets the most stringent dark matter-nucleon scattering cross-section limits achieved by a cryogenic detector for dark matter particle masses from 93 to 140 MeV/c2, with a raw exposure of 9.9 g d acquired at an above-ground facility. This work illustrates the scientific potential of detectors with athermal phonon sensors with eV-scale energy resolution for future dark matter searches. Copyright © 2020, The Authors. All rights reserved.

关键词： Phonons

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Particular SRM design methodology based on similarity theory, scale factors and FEM 9th

Particular SRM design methodology based on similarity theory...

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9th Japanese-Mediterranean Workshop on Applied Electromagnetic engineering for Magnetic, Superconducting, Multifunctional and Nano Materials, 2015

作者： Moschoudis, Angelos P. Tsekouras, George J. Kanellos, Fotios D. Kladas, Antonios G. Faculty of Electrical & Computer Engineering National Technical University of Athens 9 Iroon Polytechniou Street Athens15780 Greece Electric Circuits Laboratory Electrical and Computer Engineering Division Department of Naval Science Hellenic Naval Academy Terma Hatzikyriakou Hatzikyriakio Piraeus18539 Greece Department of Production Engineering & Management Technical University of Crete ChaniaGR 73100 Greece

ISBN: (纸本)9783035710267

This paper presents the design of geometrically similar switched reluctance machines based on similarity theory and scale factors techniques. The fundamental theory for the development of the proposed methodology is described. The proposed methodology is used for the design of a particular 21.6 W three phase 6/4 pole switched reluctance motor, which can be used as a special electrical machine (pump’s driving motor) in an artificial heart. In addition, a sensitivity analysis using FEM was performed in order to confirm the accuracy of the proposed method. © 2016 Trans Tech Publications, Switzerland.

关键词： Finite element method

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Estimation method of ionospheric TEC distribution from single frequency GPS measurements using a slant effect model

Estimation method of ionospheric TEC distribution from singl...

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URSI Asia-Pacific Radio science Conference (URSI AP-RASC)

作者： Win Zaw Hein Yusuke Kashiwa Yoshitaka Goto Yoshiya Kasahara Division of Electrical Engineering and Computer Science Kanazawa University Kanazawa Ishikawa Japan

ISBN: (纸本)9781467399838

Observational networks of GNSS signals are an important tool to observe ionospheric TEC distributions. These TEC observations are generally realized by measuring two frequency signals. Costs of multi-frequency receivers are, however, much higher than those of single frequency receivers. In the present study, we developed an estimation method of ionospheric TEC distribution from single frequency GPS measurements. In this method, the TEC distributions is assumed to be represented by a first-order gradient model whose parameters are estimated by a non-linear fitting. We confirmed the validity of the method by comparing results with TEC maps derived from GEONET data. This method can make it possible to build observational systems of ionospheric TEC in low latitude regions at low cost.

关键词： Receivers Global Positioning System Frequency measurement Meteorology Spaceborne radar Satellites

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Tunable magnetization relaxation of Fe2Cr1−xCoxSi half-metallic Heusler alloys by band structure engineering

arXiv

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arXiv 2017年

作者： He, Shikun Liu, Yifan Zheng, Yuhong Qin, Qing Wen, Zhenchao Wu, Qingyun Yang, Yi Wang, Yupu Feng, YuanPing Teo, Kie Leong Panagopoulos, Christos Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore 2 Fusionopolis Way 08-01 Innovis Singapore138634 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore117582 Singapore Department of Materials Science and Engineering National University of Singapore Singapore117574 Singapore Tohoku University Sendai980-8577 Japan Department of Physics National University of Singapore Singapore117542 Singapore

We report a systematic investigation on the magnetization relaxation properties of iron-based half-metallic Heusler alloy Fe2Cr1-xCoxSi (FCCS) thin films using broadband angular-resolved ferromagnetic resonance. Band structure engineering through Co doping (x) demonstrated by first principles calculations is shown to tune the intrinsic magnetic damping over an order of magnitude namely, 1 × 10−2-8 × 10−4. Notably, the intrinsic damping constants for samples with high Co concentration are amongst the lowest reported for Heusler alloys and even comparable to magnetic insulator yttrium iron garnet. Furthermore, a significant reduction of both isotropic and anisotropic contributions of extrinsic damping of the FCCS alloys was found in the FCCS films with x = 0.5 ~0.75, which is of particular importance for applications. These results demonstrate a practical recipe to tailor functional magnetization for Heusler alloy-based spintronics at room temperature. Copyright © 2017, The Authors. All rights reserved.

关键词： Iron alloys

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The vector-apodizing phase plate coronagraph: Design, current performance, and future development

arXiv

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arXiv 2021年

作者： Doelman, David S. Snik, F. Por, E.H. Bos, S.P. Otten, G.P.P.L. Kenworthy, M. Haffert, S.Y. Wilby, M. Bohn, A.J. Sutlieff, B.J. Miller, K. Ouellet, M. de Boer, J. Keller, C.U. Escuti, M.J. Shi, S. Warriner, N.Z. Hornburg, K.J. Birkby, J.L. Males, J. Morzinski, K.M. Close, L.M. Codona, J. Long, J. Schatz, L. Lumbres, J. Rodack, A. van Gorkom, K. Hedglen, A. Guyon, O. Lozi, J. Groff, T. Chilcote, J. Jovanovic, N. Thibault, S. de Jonge, C. Allain, G. Vallée, C. Patel, D. Côté, O. Marois, C. Hinz, P. Stone, J. Skemer, A. Briesemeister, Z. Boehle, A. Glauser, A.M. Taylor, W. Baudoz, P. Huby, E. Absil, O. Carlomagno, B. Delacroix, C. Leiden Observatory Leiden University P.O. Box 9513 Leiden2300 RA Netherlands Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Aix Marseille Univ CNRS CNES LAM Marseille France Steward Observatory University of Arizona 933 North Cherry Avenue TucsonAZ85721 United States Anton Pannekoek Institute for Astronomy University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands COPL Département de physique génie physique et optique Université Laval 2375 rue de la Terrasse QuebecG1V 0A6 Canada Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695 United States Department of Physics University of Oxford Denys Wilkinson Building Keble Road OxfordOX1 3RH United Kingdom Harvard & Smithsonian | Center for Astrophysics 60 Garden St CambridgeMA02138 United States College of Optical Sciences University of Arizona 1630 E University Blvd TucsonAZ85719 United States 650 North A‘ohōkū Place HiloHI96720 United States Astrobiology Center of NINS 2-21-1 Osawa Mitaka Tokyo181-8588 Japan NASA-Goddard Space Flight Center GreenbeltMD United States Department of Physics University of Notre Dame South BendIN United States Department of Astronomy California Institute of Technology 1200 East California Blvd. PasadenaCA91125 United States SRON Netherlands Institute for Space Research Landleven 12 Groningen9747AD Netherlands National Research Council of Canada Herzberg 5071 West Saanich Road VictoriaBCV9E 2E7 Canada Department of Physics and Astronomy University of Victoria 3800 Finnerty Road VictoriaBCV8P 5C2 Canada Department of Astronomy and Astrophysics University of California Santa Cruz 1156 High Street Santa CruzCA95064 United States Naval Research Laboratory Remote Sensing Division 4555 Overlook Ave. SW WashingtonDC20375 United States Institute for Particle Physics and Astrophysics ETH Zurich Wolfgang-Paulistr. 27 Zurich8093 Switzerland UK

Over the last decade, the vector-apodizing phase plate (vAPP) coronagraph has been developed from concept to on-sky application in many high-contrast imaging systems on 8-m class telescopes. The vAPP is an geometric-phase patterned coronagraph that is inherently broadband, and its manufacturing is enabled only by direct-write technology for liquid-crystal patterns. The vAPP generates two coronagraphic PSFs that cancel starlight on opposite sides of the point spread function (PSF) and have opposite circular polarization states. The efficiency, that is the amount of light in these PSFs, depends on the retardance offset from half-wave of the liquid-crystal retarder. Using different liquid-crystal recipes to tune the retardance, different vAPPs operate with high efficiencies (> 96%) in the visible and thermal infrared (0.55 µm to 5 µm). Since 2015, seven vAPPs have been installed in a total of six different instruments, including Magellan/MagAO, Magellan/MagAO-X, Subaru/SCExAO, and LBT/LMIRcam. Using two integral field spectrographs installed on the latter two instruments, these vAPPs can provide low-resolution spectra (R∼30) between 1 μm and 5 μm. We review the design process, development, commissioning, on-sky performance, and first scientific results of all commissioned vAPPs. We report on the lessons learned and conclude with perspectives for future developments and applications. © 2021, CC BY.

关键词： Optical transfer function

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Electro-optic frequency beamsplitters and tritters for high-fidelity photonic quantum information processing

arXiv

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arXiv 2017年

作者： Lu, Hsuan-Hao Lukens, Joseph M. Peters, Nicholas A. Odele, Ogaga D. Leaird, Daniel E. Weiner, Andrew M. Lougovski, Pavel School of Electrical and Computer Engineering Purdue Quantum Center Purdue University West LafayetteIN47907 United States Quantum Information Science Group Computational Sciences and Engineering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Bredesen Center for Interdisciplinary Research and Graduate Education University of Tennessee KnoxvilleTN37996 United States

We report experimental realization of high-fidelity photonic quantum gates for frequency-encoded qubits and qutrits based on electro-optic modulation and Fourier-transform pulse shaping. Our frequency version of the Hadamard gate offers near-unity fidelity (0.99998 ± 0.00003), requires only a single microwave drive tone for near-ideal performance, functions across the entire C-band (1530-1570 nm), and can operate concurrently on multiple qubits spaced as tightly as four frequency modes apart, with no observable degradation in the fidelity. For qutrits we implement a 3 × 3 extension of the Hadamard gate: the balanced tritter. This tritter—the first ever demonstrated for frequency modes—attains fidelity 0.9989 ± 0.0004. These gates represent important building blocks toward scalable, high-fidelity quantum information processing based on frequency encoding. Copyright © 2017, The Authors. All rights reserved.

关键词： Pulse shaping

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Representability of algebraic topology for biomolecules in machine learning based scoring and virtual screening

arXiv

引用

arXiv 2017年

作者： Cang, Zixuan Mu, Lin Wei, Guo-Wei Department of Mathematics Michigan State University MI48824 United States Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge United States Department of Biochemistry and Molecular Biology Michigan State University MI48824 United States Department of Electrical and Computer Engineering Michigan State University MI48824 United States

This work introduces a number of algebraic topology approaches, such as multicomponent persistent homology, multi-level persistent homology and electrostatic persistence for the representation, characterization, and description of small molecules and biomolecular complexes. Multicomponent persistent homology retains critical chemical and biological information during the topological simplification of biomolecular geometric complexity. Multi-level persistent homology enables a tailored topological description of inter- and/or intra-molecular interactions of interest. Electrostatic persistence incorporates partial charge information into topological invariants. These topological methods are paired with Wasserstein distance to characterize similarities between molecules and are further integrated with a variety of machine learning algorithms, including k-nearest neighbors, ensemble of trees, and deep convolutional neural networks, to manifest their descriptive and predictive powers for chemical and biological problems. Extensive numerical experiments involving more than 4,000 protein-ligand complexes from the PDBBind database and near 100,000 ligands and decoys in the DUD database are performed to test respectively the scoring power and the virtual screening power of the proposed topological approaches. It is demonstrated that the present approaches outperform the modern machine learning based methods in protein-ligand binding affinity predictions and ligand-decoy discrimination. Copyright © 2017, The Authors. All rights reserved.

关键词： Ligands

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