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You searched on: Author: charles clark

Displaying records 11 to 20 of 227 records.
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11. The NIST Handbook of Mathematical Functions
Published: 5/12/2010
Authors: Frank William John Olver, Daniel W Lozier, Ronald F Boisvert, Charles W Clark
Abstract: The NIST Handbook of Mathematical Functions supplies validated reference information in 36 chapters on a wide selection of important mathematical functions, covering the properties necessary for their use in scientific applications, together with gen ...

12. RECIST vs. Volume Measurement in Medical CT Using Ellipsoids of Known Size
Published: 4/12/2010
Authors: Zachary H Levine, Bruce R. Borchardt, Nolan J Brandenburg, Charles W Clark, Balasubramanian Muralikrishnan, Craig M Shakarji, Joseph J. Chen, Eliot L. Siegel
Abstract: (a) Purpose: We wanted to test the extent to which two common methods of determining the sizes of tumors would perform when compared to a statistically significant number of well-characterized reference objects. The size of the objects was chosen to ...

13. Ultracold Atom Spin Field Effect Transistor
Published: 9/14/2009
Authors: Jay Vaishnav, Julius Ruseckas, Charles W Clark, Gediminas Juzelunas
Abstract: We propose a method of constructing cold atom analogs of the spintronic device known as the Datta-Das transistor (DDT), which despite its seminal conceptual role in spintronics, has never been successfully realized with electrons. We propose two alte ...

14. Collisional cooling of ultra-cold atom ensembles using Feshbach resonances
Published: 9/8/2009
Authors: Ludwig G. Mathey, Eite Tiesinga, Paul S Julienne, Charles W Clark
Abstract: We propose a new type of cooling mechanism for ultra-cold fermionic atom ensembles, which capitalizes on the energy dependence of inelastic collisions in the presence of a Feshbach resonance. We first discuss the case of a single magnetic reson ...

15. Counterflow and paired superfluidity in one-dimensional Bose mixtures in optical lattices
Published: 8/24/2009
Authors: Anzi A. Hu, Ludwig G. Mathey, Ippei Danshita, Eite Tiesinga, Carl J Williams, Charles W Clark
Abstract: We study the quantum phases of mixtures of ultra-cold bosonic atoms held in an optical lattice that confines motion or hopping to one spatial dimension. The phases are found by using Tomonaga-Luttinger liquid theory as well as the numerical method of ...

16. Experimental Study of High Speed Polarization -Coding Quantum Key Distribution with Sifted -Key Rates Over Mbit/s
Published: 6/1/2009
Authors: Xiao Tang, Lijun Ma, Alan Mink, Anastase Nakassis, Barry J. Hershman, Joshua C Bienfang, David H Su, Ronald F Boisvert, Charles W Clark, Carl J Williams
Abstract: We have demonstrated a polarization encoded, fiber-based quantum key distribution system operating at 850 nm in the B92 protocol. With a quantum bit transmission rate i.e. optical pulse driving frequency of 625 MHz and a mean photon number of 0.1, we ...

17. Quantum Key Distribution System Operating at Sifted-Key Rate Over 4 Mbit/s^u1^
Published: 6/1/2009
Authors: Xiao Tang, Lijun Ma, Alan Mink, Anastase Nakassis, Hai Xu, Barry J. Hershman, Joshua C Bienfang, David H Su, Ronald F Boisvert, Charles W Clark, Carl J Williams
Abstract: A complete fiber-based polarization encoding quantum key distribution (QKD) system based on the BB84 protocol has been developed at National Institute of Standard and Technology (NIST). The system can be operated at a sifted key rate of more than 4 M ...

18. Topological Insulators and Metals in Atomic Optical Lattices
Published: 5/28/2009
Authors: Tudor Stanescu, Victor Galitski, Jay Vaishnav, Charles W Clark, Sankar Das Sarma
Abstract: We propose the realization of topological quantum states with cold atoms trapped in an optical lattice. We discuss an experimental setup that generates a two-dimensional hexagonal lattice in the presence of a light-induced periodic vector potential, ...

19. Measurement of Small Birefringence and Loss in a Nonlinear Single-mode Waveguide
Published: 5/11/2009
Authors: Daniel Rogers, Charles W Clark, Christopher Richardson, Julius Goldhar
Abstract: We design and fabricate a birefringent semiconductor waveguide for application to nonlinear photonics, demonstrating that it is possible to engineer a small birefringence into such a device using multiple core layers. We also demonstrate a simple t ...

20. Symmetry-Breaking and Symmetry-Restoring Dynamics of a Mixture of Bose-Einstein Condensates in a Double Well
Published: 3/16/2009
Authors: Indubala Indradev Satija, Radha Balakrishnan, P. Naudus, Jeffrey Heward, M Edwards, Charles W Clark
Abstract: We study the coherent nonlinear tunneling dynamics of a binary mixture of Bose-Einstein condensates in a double-well potential. We demonstrate the existence of a new type of coherence associated with the symmetry restoring nonlinear swapping modes ...

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