U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 34351 - 34375 of 73832

Josephson Junction Materials Research Using Phase Qubits

May 30, 2006
Author(s)
Raymond Simmonds, Dustin P. Hite, Robert McDermott, Matthias Steffen, Ken B. Cooper, Kristine Lang, John M. Martinis, David P. Pappas
At present, the performance of superconducting qubits is limited by decoherence. Strong decoherence of phase qubits is associated with spurious microwave resonators residing within the Josephson junction tunnel barrier [1]. In this work, we investigate

Herding Hash Functions and the Nostradamus Attack

May 28, 2006
Author(s)
John M. Kelsey, Tadayoshi Kohno
In this paper, we develop a new attack on Damgaard-Merkle hash functions, called the herding attack, in which an attacker who can find many collisions on the hash function by brute force can first provide the hash of message, and later ''herd'' any given

Selecting Effective Test Sets

May 26, 2006
Author(s)
Leonard E. Gebase, Robert D. Snelick, Roch Bertucat
One of the first problems that must be addressed when attempting to test the reliability of any software implementation is determining what is to be tested. The number of paths an implementation can follow is generally much too large to be able to test all

Temperature dependence of quantum dot homogeneous linewidth

May 26, 2006
Author(s)
Joseph J. Berry, Martin Stevens, Richard Mirin, Kevin L. Silverman
We examine the temperature dependence of the ground state homogeneous linewidth in InGaAs/GaAs quantum dots. Measurements are performed on quantum dots in a semiconductor waveguide.

Nonlinear charge transport in semiconducting polythiophene

May 23, 2006
Author(s)
Jan Obrzut
We measured the complex impedance and nonlinear conductivity for regioregular poly(3-hexylthiophene) (P3HT) by recording and analyzing AC waveforms at their fundamental frequency and at higher order harmonic frequencies. We used 50 µm thick films of P3HT

Ferromagnetic resonance linewidth in metallic thin films: Comparison of measurement methods

May 22, 2006
Author(s)
Sangita S. Kalarickal, Pavol Krivosik, Mingzhong Wu, C E. Patton, Michael Schneider, Pavel Kabos, Thomas J. Silva, John P. Nibarger
Strip line (SL), vector network analyzer (VNA), and pulsed inductive microwave magnetometer (PIMM) techniques were used to measure the ferromagnetic resonance (FMR) linewidth for a series of Permalloy films with thicknesses of 50 and 100 nm. The SL-FMR

Infrared Absorptions of NH 3 (H 2 ) Complexes Trapped in Solid Neon

May 22, 2006
Author(s)
Marilyn E. Jacox, Warren E. Thompson
When a very small concentration of H2 is added to a Ne:NH3 = 800:1 sample and the resulting mixture is deposited at 4.3 K, a new absorption appears at 4151.1 cm?1 which can be assigned to the H2 stretching fundamental of H2 (j = 1) complexed with NH3

Frequency-Resolved Coherent LIDAR using a Femtosecond Fiber Laser

May 21, 2006
Author(s)
William C. Swann, Nathan R. Newbury
We present a frequency comb-based, frequency-resolved coherent LIDAR (FReCL) that provides higher performance than that of conventional pulsed range/Doppler LIDARs, dramatically reduces local oscillator timing requirements, and compensates for path

Optical and microwave frequency synthesis with an integrated fiber frequency comb

May 21, 2006
Author(s)
L Hartl, Martin E. Fermann, W Swann, John J. McFerran, Ian R. Coddington, Qudsia Quraishi, Scott A. Diddams, Nathan R. Newbury, Carston Langrock, M M. Fejer, P. S. Westbrook, Jeffrey W. Nicholson, K Feder
We demonstrate optical coherence over a broad spectral range of two independent fiber frequency combs. Additionally, we demonstrate microwave stability of better than 2x10 -14 in 1 second for an optically integrated fiber frequency comb.

Raman Suppression in a Microstructure Fiber With Dual Laser Pumps

May 21, 2006
Author(s)
Jingyun Fan, Alan L. Migdall
Coupling two frequency-conjugate laser pulses into an optical fiber, we observe at the middle frequency either enhanced photon generation via four-wave mixing or suppressed Raman emission depending on the phase difference between the two pumps.

Recent Advances in Solid-State Single Photon Detectors

May 21, 2006
Author(s)
Danna Rosenberg, Sae Woo Nam, Richard Mirin, Philip A. Hiskett, Jane E. Nordholt
This paper reviews recent advances in the detection of single photons at visible and near-infrared wavelengths, focusing on detectors based on superconducting and semiconducting technologies.
Displaying 34351 - 34375 of 73832
Was this page helpful?