Qubits with Electrons on Liquid Helium

  • M.I. Dykman
  • P. Seddighrad
  • Platzman P.

We study dissipation effects for electroncs on the surface of liquid helium, which may serve as qubits of a quantum computer. Each electron is localized in a 3D potential well formed by the image potential in helium and the potential from a submicron electrode submerged into helium. We estimate parameters ...

Organic Transistors that Use Source/Drain Electrodes Supported by High Resolution Rubber Stamps

  • Bao Z.
  • Cirelli R.
  • J. Zaumseil
  • Rogers J.
  • T. Someya
  • Y-L. Loo

Soft contact lamination and metal-coated elastomeric stamps provide the basis for a convenient and non-invasive approach to establishing high resolution electrical contacts to electroactive organic materials. The features of relief on the stamp define, with nanometer resolution, the geometry and separation of electrically independent electrodes that are formed by uniform, ...

Ambipolar Organic Thin Film Transistors of Cationic and Anionic Phthalocyanines Fabricated Using Layer-by-Layer Deposition from Aqueous Solution

  • Bao Z.
  • F. Kaneko
  • J. Locklin
  • K. Onishi
  • K. Shinbo
  • R.C. Advincula

Organic thin film field effect transistors of water soluble phthalocyanine derivatives containing both cationic and anionic end groups were successfully prepared using the layer-by-layer deposition technique. The alternating growth of the films and subsequent transistor properties were studied with a variety of techniques including ellipsometry, UV-vis spectroscopy, polarized UV-vis spectroscopy, ...

Algorithms for Computing QoS Paths with Restoration

  • A. Orda
  • A. Sprintson
  • Bejerano Y.
  • Rastogi R.
  • Y. Breitbart

We undertake a comprehensive study of problems related to finding suitable restoration topologies for QoS paths. We consider both bottleneck QoS constraints, such as bandwidth, and additive QoS constraints, such as delay and jitter. This is the first study to provide a rigorous solution, with proven guaranties, to the combined ...

RF Architecture of Frequency Agile Basestations

  • Fischer G.

1) Introduction 2)Motivation for flexible radios 3) Frequency agile Radio based on RF-MEMS 4) RF-MEMS RFBs (Radio Function Blocks) 5) RF-MEMS for terminals 6) Summary

RF-MEMS for basestations

  • Fischer G.

Talk: 1) Introduction 2) Frequency agile radio versus SDR 3) Multiband power amplifiers 4) Summary

Unpassivated AlGaN-GaN HEMTs with minimal RF dispersion grown by plasma-assisted MBE on semi-insulating 6H-SiC substrates

  • Manfra M.
  • Weimann N.

High Electron Mobility Transistors are fabricated from AlGaN/GaN heterostructures grown by plasma-assisted MBE on semi-insulating 6H-SiC substrates. Low-field electron mobilities of more than 1,300 cm sup 2/Vs at a sheet charge density of 1.2 x 10 sup 15 cm sup -2 have been obtained repeatedly. HEMT devices with a gate ...

AlGaN/GaN HEMTs Grown by Molecular Beam Epitaxy on Sapphire, SiC, and HVPE GaN Templates

  • Baldwin K.
  • D.V. Lang
  • Hsu J.
  • Manfra M.
  • Pfeiffer L.
  • R.J. Molnar
  • S.N.G. Chu
  • Weimann N.
  • West K.

Molecular Beam Eiptaxy of GaN and related alloys is becoming a rival to the more established Metalorganic Vapor Phase Epitaxy. Excellent control of impurity, interface abruptness, and in-situ monitoring of the growth are driving the increase in quality of MBE epilayers. We have developed nucleation schemes with plasma-assisted MBE on ...

A Study of Opportunism for Multiple Antenna Systems

  • Ozarow L.
  • Sharma N.

Recently proposed opportunistic beam-forming exploits multi-user diversity to reduce the feedback by not requiring the pre-coding matrix used for closed loop schemes to be known at the transmitter. Opportunism could also be benficially employed for other multiple antenna transmission techniques. For single antenna receivers, we study opportunistic beam-forming, co-phasing and ...

Dynamic Configuration of Mobile Devices for Wireless Internet Access

  • Laporta T.
  • Ramjee R.
  • Salgarelli L.
  • Thuel S.

This chapter provides a taxonomy of dynamic configuration solutions for mobile devices and focuses on the study of two proposals which use the home agent to mediate a mobile device's access to DHCP, namely, Transient Tunneling and DHCP proxy [8,12,13]. In Transient Tunneling, a home agent is used to temporarily ...

Robust Monitoring of Link Delays and Faults in IP Networks

  • Bejerano Y.
  • Rastogi R.

In this paper, we develop failure-resilient techniques for monitoring link delays and faults in a Service Provider or Enterprise IP network. Our two-phased approach attempts to minimize both the monitoring infrastructure costs as well as the additional traffic due to probe messages.

Congestion Control Policies for IP-Based CDMA Radio Access Networks

  • Kasera S.
  • Ramjee R.
  • Thuel S.
  • Wang X.

In this paper we propose and evaluate three congestion control mechanisms, admission control, diversity control, and router control, to maximize network capacity while maintaining good voice quality. We first propose two new enhancements to CDMA call admission control so that a unified view of both IP RAN and air interface ...

Ultra High-Capacity Long-Haul 40 Gb/s WDM Transmission with 0.8 bits/s/Hz Spectral Efficiency by Means of Strong Optical Filtering

  • Agarwal A.
  • Banerjee S.
  • Grosz D.
  • Gurevich A.
  • Kung A.
  • Maywar D.
  • Wood T.

All-Raman single-band transmission of 5.12 Tb/s (128 x 42.7 Gb/s) with 50 GHz channel spacing over 1280 km of Standard Single-Mode Fiber is successfully demonstrated. This ultra high capacity for a spectral efficiency of 0.8 bits/s/Hz is achieved by strong optical filtering of On-Off Keying Carrier-Suppressed Return-to-Zero signals. Simulation results ...

Enhanced and Suppressed Birefringence in Fiber Bragg Gratings

  • L.E. Pipe
  • S. Pereira
  • Slusher R.

We demonstrate theoretically and experimentally that the two orthogonal polarizations of light see an unequal index constrast in a UV induced fiber Bragg grating. We find that in a Bragg grating the phase velocity mismatch is a function of detuning, and hence we can introduce an effective birefringence. The description ...

Polarization Effects in Birefringent Bragg Gratings with a Kerr Nonlinearity

  • L.E. Pipe
  • S. Pereira
  • Slusher R.

We show that a Kerr nonlinear, birefringent Bragg grating allows the investigation of three regimes of nonlinear pulse propagation. The regimes are entered by tuning the frquency of the pulse relative to the stop band of the grating. Detuning away from the stop band lowers the intensity required for soliton ...

Long-Haul 64 x 40 Gb/s DWDM Transmission over Commercial Fiber Types with Large Operating Margins

  • Agarwal A.
  • Banerjee S.
  • Grosz D.
  • Kung A.
  • Maywar D.
  • Movassaghi M.
  • Wood T.

We report results on 40 Gb/s DWDM transmission over distances greater than 1000km on several commercially available fiber types using a single 53 nm transmission band. The use of a wide single-band is made possible by forward and backward Raman amplification and makes for an easier system design and better ...

Supercontinuum Quantum Cascade Laser for Subpicosecond Mid-IR Pulse Generation

  • Capasso F.
  • Cho A.
  • Gmachl C.
  • Hc L.
  • Hwang H.
  • Sivco D.
  • Soibel A.

A supercontinuum quantum cascade (QC) laser with flat optical gain from 6.7 to 7.4mum wavelength was designed and fabricated to provide a wavelength independent threshold current.

Leakage of Energetic Particles from Jupiter's Dusk Magnetosphere: Dual Spacecraft Observations

  • A. Lagg
  • A.F. Cheng
  • B.H. Mauk
  • D.C. Hamilton
  • D.G. Mitchell
  • D.J. Williams
  • G. Gloeckler
  • J. Dandouras
  • J. Woch
  • Lanzerotti L.
  • N. Krupp
  • R.W. Mcentire
  • S. Livi
  • S.A. Espinosa
  • S.M. Krimigis
  • T.P. Armstrong

For the first time, two spacecraft, Galileo and Cassini, observed Jupiter's magnetosphere simultaneously for nearly half a year between October 2000 and March 2001. This provided an unprecedented opportunity to disentangle spatial and temporal aspects of the dynamics of the Jovian magnetosphere. In this paper we report new results on ...

A 2 Rebit Gate Universal for Quantum Computing

  • Grover L.
  • T. Rudolph

We show, within the circuit model, how any quantum computation can be efficiently performed using states with only real amplitudes (a result known within the Quantum Turing Machine model). This allows us to identify a 2-qubit (in fact 2-rebit) gate which is universal for quantum computing, although it cannot be ...

Impurity Effects on Photoluminescence in Lateral Epitaxially Overgrown GaN

  • F.F. Schrey
  • Hsu J.
  • Matthews M.
  • S.L. Gu
  • T.F. Kuech

Using a two-photon laser scanning microscope, the spectral and intensity variations of photoluminescence (PL) in a lateral epitaxial overgrown GaN film were mapped with submicron resolution. The PL results are correlated with carrier density vairation obtained by confocal Raman microscopy and surface Fermi level positions obtained by scanning Kelvin force ...