We demonstrate a compact, robust, and highly efficient source of polarization-entangled photons, based on linear bi-directional down-conversion in a novel 'folded sandwich' configuration. Bi-directionally pumping a single periodically poled KTiOPO(4) (ppKTP) crystal with a 405-nm laser diode, we generate entangled photon pairs at the non-degenerate wavelengths 784 nm (signal) and 839 nm (idler)...

Dimerization of Radical-Anions: Nitride Clusterfullerenes versus Empty Fullerenes Alexey A. Popov,* Stanislav M. Avdoshenko, Gianaurelio Cuniberti, and Lothar Dunsch Department of Electrochemistry and Conducting Polymers, The Center of Spectroelectrochemistry, Leibniz Institute of Solid State and Materials Research (IFW) Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany Chemistry Department, ...

light-emitting diodes Wonseok Lee, Min-Ho Kim, Di Zhu, Ahmed N. Noemaun, Jong Kyu Kim, and E. F. Schubert Future Chips Constellation and Engineering Science Program, Rensselaer Polytechnic Institute, Troy, New York 12180, USA Samsung LED, Suwon 443-743, South Korea Future Chips Constellation and Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New Y...

Wu Li,1,2,* Hâldun Sevinçli,2,* Stephan Roche,2,3,4,† and Gianaurelio Cuniberti2,5,‡ 1Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China 2Institute for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, D-01062 Dresden, Germany 3CIN2 (ICN-CSIC) and Universitat Autónoma de Barcelona, Catalan Institute of Nanotechnology, Campus UAB, ...

Dinur and Shamir have described cube attacks at EUROCRYPT ’09 and they have shown how efficient they are on the stream cipher Trivium up to 767 rounds. These attacks have been extended to distinguishers but since this seminal work, no better results on the complexity of key recovery attacks on Trivium have been presented. It appears that the time complexity to compute cubes is expensive and the...

Information professionals face the challenge of making sense of an ever increasing amount of information. Storylines can provide a useful way to present relevant information because they reveal explanatory relations between events. In this position paper, we present and discuss the four main challenges that make it difficult to get to these stories and our first ideas on how to start resolving ...

G. L. Pascut,1 T. Birol,1 M. J. Gutmann,2 J. J. Yang,3 S.-W. Cheong,1,3,4 K. Haule,1 and V. Kiryukhin1,4 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA 2ISIS Facility, STFC-Rutherford Appleton Laboratory, Didcot OX11 OQX, United Kingdom 3Laboratory of Pohang Emergent Materials and Department of Physics, Pohang University of Science and Technology, Po...

E. Erdogan,1,* I. Popov,2 C. G. Rocha,3 G. Cuniberti,3,4 S. Roche,3,5,6 and G. Seifert1 1Institut fur Physikalische Chemie, Technische Universitat Dresden, D-01062 Dresden, Germany 2School of Physics and CRANN, Trinity College, Dublin 2, Ireland 3Institute for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, D-01062 Dresden, Germany 4Division of IT Co...

Shyam K. Singh and Lindsay A. Summers* Department of Chemistry. The University of Newcastle, N.S.W. 2308. Australia Larry A. Hick Department of Chemistry. The University of Wollongong. N.S.W. 2500. Australia Z. Naturforsch. 43b, 778-784 (1988); received November 12. 1987 3,3'-Bipyridinium Quaternary Salts, Fast Atom Bombardment Mass Spectra, Reduction Potentials Reaction of 3,3'-bipyridine with...

We used the crossed-cylinder aberroscope technique to obtain the near infrared (784 nm) wave-front aberration of the human eye. We compared the results with those obtained under the same conditions using red light (633 nm). Other than the greater retinal scattering of the near infrared light, third- and fourth-order wave-front aberrations are similar in both wavelengths. Values of the calculate...