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Displaying 34676 - 34700 of 74175

Microfabricated atomic clocks and magnetometers

May 31, 2006
Author(s)
Svenja A. Knappe, P Schwindt, Vladislav Gerginov, V Shah, Hugh Robinson, Leo W. Hollberg, John E. Kitching, Li-Anne Liew, John Moreland
We demonstrate the critical subsystems of compact atomic clocks and magnetometers based on microfabricated physics packages. The clock components have a volume below 5 cm 3, a fractional frequency instability below 6x10 -10/τ 1⁄2, and consume 200 mW of

Voltage Versus Magnetic Field Measurements on Nb 3 Sn Wires

May 31, 2006
Author(s)
Loren F. Goodrich
We measured voltage versus magnetic field (V-H}/I}) on commercial Nb 3Sn wires. Typically, voltage-current (V-I) at constant field is measured to determine the critical current (I c). Recently, V-H at constant or ramping current is being measured to assess

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
Displaying 34676 - 34700 of 74175
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