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Author: charles clark

Displaying records 21 to 30 of 224 records.
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21. Quantum key distribution at GHz transmission rates
Published: 2/11/2008
Authors: Alessandro Restelli, Joshua C Bienfang, Alan Mink, Charles W Clark
Abstract: Quantum key distribution (QKD) channels are typically realized by transmitting and detecting single photons, and therefore suffer from dramatic reductions in throughput due to both channel loss and noise. These shortcomings can be mitigated by applyi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901213

22. Pseudo-Fermionization of 1-D Bosons in Optical Lattices
Published: 2/2/2008
Authors: G Pupillo, A M. Rey, Carl J Williams, Charles W Clark
Abstract: We present a model that generalizes the Bose-Fermi mapping for strongly correlated 1D bosons in an optical lattice, to cases in which the average number of atoms per site is larger than one. This model gives an accurate account of equilibrium propert ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840787

23. Accurate Determination of Electric-Dipole Matrix Elements in K and Rb From Stark Shift Measurements
Published: 11/30/2007
Authors: B Arora, M S Safronova, Charles W Clark
Abstract: Stark shifts of potassium and rubidium D1 lines have been measured with high precision by Miller et al [1]. In this work, we combine these measurements with our all-order calculations to determine the values of the electric-dipole matrix elements for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840267

24. Magic Wavelengths for the np - ns Transitions in Alkali-Metal Atoms
Published: 11/15/2007
Authors: B Arora, M S Safronova, Charles W Clark
Abstract: Extensive calculations of the electric-dipole matrix elements in alkali-metal atoms are conducted using the relativistic all-order method. This approach is a linearized version of the coupled-cluster method, which sums infinite sets of many-body pert ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840266

25. Quantum Phases of Bosons in Double-Well Optical Lattices
Published: 10/4/2007
Authors: Ippei Danshita, J G Williams, Carlos Sa de Melo, Charles W Clark
Abstract: We study the superfluid to Mott insulator transition of bosons in a two-legged ladder optical lattice, of a type accessible in current experiments on double-well optical lattices. The zero-temperature phase diagram is mapped out, with a focus on its ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840262

26. Detector Dead-Time Effects and Paralyzability in High-Speed Quantum Key Distribution
Published: 9/10/2007
Authors: Daniel Rogers, Joshua C Bienfang, Anastase Nakassis, Hai Xu, Charles W Clark
Abstract: Recent advances in quantum key distribution (QKD) have given rise to systems that operate at transmission periods significantly shorter than the dead times of their component single-photon detectors. As systems continue to increase in transmission ra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840271

27. The TREC 2005 Terabyte Track
Published: 8/27/2007
Authors: Charles L. Clarke, Falk Scholer, Ian M Soboroff
Abstract: The Terabyte Track explores how retrieval and evaluation techniques can scale to terabyte-sized collections, examining both efficiency and effectiveness issues. TREC 2005 is the second year for the track. The track was introduced as part of TREC 2004 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150638

28. Reliable Information Retrieval Evaluation With Incomplete and Biased Judgements
Published: 7/23/2007
Authors: Stefan Buttcher, Charles L. Clarke, Peter C Yeung, Ian M Soboroff
Abstract: Information retrieval evaluation based on the pooling method is inherently biased against systems that did not contribute to the pool of judged documents. This may distort the results obtained about the relative quality of the systems evaluated and t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51167

29. Metal-Insulator Transition Revisited for Cold Atoms in Non-Abelian Gauge Potentials
Published: 11/20/2006
Authors: Indubala Indradev Satija, D C Dakin, Charles W Clark
Abstract: We discuss the possibility of realizing metal-insulator transitions with ultracold atoms in two-dimensional optical lattices in the presence of artificial gauge potentials. Such transitions have been extensively studied for magnetic fields correspon ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840248

30. Free-space quantum cryptography in the H-alpha Fraunhofer window
Published: 9/1/2006
Authors: D J Rogers, C J Bienfang, Alan Mink, Charles W Clark, Barry J. Hershman, Anastase Nakassis, Xiao Tang, Lijun Ma, David H Su, Carl J Williams
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51339



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