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Displaying 476 - 500 of 615

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.

Quantum key distribution at telecom wavelengths with noise-free detectors

January 13, 2006
Author(s)
Danna Rosenberg, Sae Woo Nam, Philip A. Hiskett, Charles G. Peterson, Richard J. Hughes, Jane E. Nordholt, Adriana Lita, Aaron J. Miller
The length of a secure link over which a quantum key can be distributed depends on the efficiency and dark-count rate of the detectors used at the receiver. We report on the first demonstration of quantum key distribution using transition-edge sensors with

Single photon source characterization with a superconducting single photon detector

December 26, 2005
Author(s)
Robert Hadfield, Martin Stevens, Stephen Gruber, Aaron J. Miller, Robert E. Schwall, Richard Mirin, Sae Woo Nam
Superconducting single photon detectors (SSPD) based on nanopatterned niobium nitride wires offer single photon counting at fast rates, low jitter, and low dark counts, from visible wavelengths well into the infrared. We demonstrate the first use of an

Low-frequency phase locking in high-inductance superconductng nanowires

November 8, 2005
Author(s)
Robert Hadfield, Aaron J. Miller, Sae Woo Nam, Richard L. Kautz, Robert E. Schwall
Niobium nitride nanowires show considerable promise as high-speed single-photon detectors. We report the observation of an anomalous low-frequency ($\sim10$MHz) response in long, superconducting NbN nanowires (100nm wide, 4nm thick, and $500\mu$m long)

Noise-free high-efficiency photon-number-resolving detectors

June 17, 2005
Author(s)
Danna Rosenberg, Adriana Lita, Aaron J. Miller, Sae Woo Nam
High-efficiency optical detectors that can determine the number of photons in a pulse of monochromatic light have applications in a variety of physics studies, including post-selection-based entanglement protocols for linear optics quantum computing and

Antenna coupled niobium bolometers for 10 (mu)m radiation detection

June 1, 2005
Author(s)
Robert Hadfield, Aaron J. Miller, Sae Woo Nam, Erich N. Grossman, Robert E. Schwall,
We report on the fabrication and testing of antenna-coupled niobium bolometers for 10-micron wavelength radiation detection. We use 20 nm thick Nb films on oxidized Si substrates. The bolometer design consists of a 1 micron x 1 micron Nb microbridge

Tuning of Tungsten Thin Film Superconducting Transition Temperature for Fabrication of Photon Number Resolving Detectors

June 1, 2005
Author(s)
Adriana Lita, Danna Rosenberg, Sae Woo Nam, Aaron J. Miller, Davor Balzar, L. M. Kaatz, R. E. Schwall
Tungsten thin films can form in one of two crystal structures: alpha (bcc), with a superconducting transition temperature (T c) of 15 mK, and beta (A15), with a T c between 1 and 4 K. Films with intermediate T cs are composed of both alpha and beta phases

Progress on Johnson Noise Thermometry using a Quantum Voltage Noise Source for Calibration

April 1, 2005
Author(s)
Sae Woo Nam, Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs, Weston L. Tew, D. R. White, John M. Martinis
We describe our progress towards a high-precision measurement of temperature using Johnson noise. Using a Quantized Voltage Noise Source (QVNS) based on the Josephson effect as a calculable noise source, we have been able to measure the ratio of the

Photonic Technologies for Quantum Information Processing

October 2, 2004
Author(s)
Prem Kumar, P G. Kwiat, Alan L. Migdall, Sae Woo Nam, Jelena Vuckovic, F Wong
The last several years have seen tremendous research toward practical optical quantum information processing, including single- and entangled-photon sources and high-efficiency photon counting detectors, covering a range of wavelengths. We review some of