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Author: charles clark

Displaying records 11 to 20 of 222 records.
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11. 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 ...

12. 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 ...

13. 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, ...

14. 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 ...

15. 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 ...

16. Phase transitions, entanglement and quantum noise interferometry in cold atoms
Published: 3/5/2009
Authors: F. Mintert, A.M. Rey, Indubala Indradev Satija, Charles W Clark
Abstract: We show that entanglement monotones can characterize the pronounced enhancement of entanglement at a quantum phase transition if they are sensitive to long-range high order correlations. These monotones are found to develop a sharp peak at the critic ...

17. Creating a supersolid in one-dimensional Bose mixtures
Published: 1/15/2009
Authors: Ludwig G. Mathey, Ippei Danshita, Charles W Clark
Abstract: We identify a one-dimensional supersolid phase in a binary mixture of near-hardcore bosons with weak, local interspecies repulsion. We find realistic conditions under which such a phase, defined here as the coexistence of quasi-superfluidity and quas ...

18. The TREC 2006 Terabyte Track
Series: Special Publication (NIST SP)
Published: 3/24/2008
Authors: Stefan Buttcher, Charles L. Clarke, Ian M Soboroff
Abstract: The primary goal of the Terabyte Track is to develop an evaluation methodology for terabyte-scale document collections. In addition, we are interested in efficiency and scalability issues, which can be studied more easily in the context of a larger c ...

19. 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 ...

20. 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 ...

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