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Displaying 226 - 250 of 301

Single Photon Detector Comparison in a Quantum Key Distribution Link Testbed

October 25, 2006
Author(s)
Jonathan L. Habif, David S. Pearson, Robert Hadfield, Robert E. Schwall, Sae Woo Nam, Aaron J. Miller
We provide a direct comparison between the InGaAs avalanche photodiode (APD) and the NbN superconducting single photon detector (SSPD) for applications in fiber-based quantum cryptography. The quantum efficiency and dark count rate were measured for each

Time-correlated single-photon counting with superconducting single-photon detectors

October 1, 2006
Author(s)
Martin Stevens, Robert Hadfield, Robert E. Schwall, Sae Woo Nam, Richard Mirin
We report use of a niobium nitride superconducting single-photon detector in a time-correlated single-photon counting experiment. The detector has a timing jitter of 68 +/- 3 ps full-width at half-maximum with a Gaussian temporal profile. The detector's

Long-distance quantum key distribution in optical fibre

September 14, 2006
Author(s)
Philip A. Hiskett, Danna Rosenberg, Charles G. Peterson, Richard J. Hughes, Jane E. Nordholt, Sae Woo Nam, Adriana Lita, Aaron J. Miller
Use of low-noise detectors can both increase the secret bit rate of long-distance quantum key distribution (QKD) and dramatically extend the length of a fibre optic link over which secure keys can be distributed. Previous work has demonstrated the use of

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

Johnson Noise Thermometry Using a Quantum Voltage Noise Source for Calibration

June 1, 2004
Author(s)
Sae Woo Nam, Samuel P. Benz, Paul D. Dresselhaus, 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 calibrated noise source, we have been able to measure the gallium and water

Low temperature optical photon detectors for quantum information applications

March 11, 2004
Author(s)
Sae Woo Nam, Aaron J. Miller, Danna Rosenberg
There is increasing interest in using high-performance cryogenic optical photon detectors in a variety of applications in quantum information science and technology. These applications require detectors that have extremely low dark count rates, high count

A Time-Domain SQUID multiplexer for readout of x-ray microcalorimeter arrays

January 1, 2004
Author(s)
W.Bertrand (Randy) Doriese, Jonathan Beall, Joern Beyer, Steven Deiker, S. L. Ferreira, Gene C. Hilton, Kent D. Irwin, John M. Martinis, Sae Woo Nam, Carl D. Reintsema, Joel Ullom, Leila R. Vale
SQUID multiplexers are being developed at NIST for the readout of large arrays of transition-edge-sensor (TES) detectors. Applications for these arrays include x-ray materials analysis on a scanning-electron microscope and astronomical cameras for x-ray

Development and Characterization of a TES Optical Imaging Array for Astrophysics Applications

December 20, 2003
Author(s)
J. Burney, T. Bay, P. Brink, B. Cabrera, J. P. Castle, R. W. Romani, A. Tomada, Sae Woo Nam, Aaron J. Miller, John M. Martinis, E. Wang, T. Kenny, B. A. Young
Our research group has successfully developed photon detectors capable of both time-stamping and energy-resolving individual photons at very high rates in a wide band from near IR through optical and into near UV. We have currently fabricated 32-pixel

Near Unity Absorption in Tungsten films

December 19, 2003
Author(s)
Danna Rosenberg, Sae Woo Nam, Aaron J. Miller, Arto Salminen, Erich N. Grossman, Robert E. Schwall, John M. Martinis
The number resolving ability and extremely low dark count rate of tungsten transition-edge sensors (TESs) make them excellent candidates to replace avalanche photo diodes (APDs) in quantum information experiments, including quantum key distribution and

Direct observation of photon pairs at a single output port of a beam-splitter interferometer

December 16, 2003
Author(s)
Matthew Shaw, Giovanni Di Giuseppe, A. Sergeinko, Bahaa E. A. Saleh, Malvin C. Teich, Aaron J. Miller, Sae Woo Nam
The seminal experiment carried out by Hong, Ou, and Mandel some fifteen years ago is one of the most important in the annals of quantum optics. This experiment demonstrated that two indistinguishable photons incident on a simple beam splitter interfere in
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