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Displaying 426 - 450 of 615

Submicrometer photoresponse mapping of nanowire superconducting single-photon detectors

December 13, 2007
Author(s)
Robert Hadfield, Paul A. Dalgarno, John A. O'Connor, Euan Ramsay, Richard Warburton, Eric Gansen, Burm Baek, Martin Stevens, Richard Mirin, Sae Woo Nam
We report on the photoresponse mapping of nanowire superconducting single-photon detectors using a focal spot significantly smaller than the device area (10X10 υ 2). Using a confocal microscope configuration and solid immersion lens, we achieve a spot size

Photon-number-discriminating detection using a quantum-dot, optically gated, field-effect transistor

October 1, 2007
Author(s)
Eric Gansen, Mary A. Rowe, M. Greene, Danna Rosenberg, Todd E. Harvey, Mark Su, Robert Hadfield, Sae Woo Nam, Richard Mirin
Detectors with the capability to directly measure the photon number of a pulse of light 1-3 enable linear optics quantum computing 4, affect the security of quantum communications 5, and can be used to characterize 6-8 and herald 9 non-classical states of

Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock

August 6, 2007
Author(s)
Qiang Zhang, Xiuping Xie, Hiroki Takesue, Sae Woo Nam, Carsten Langrock, M. M. Fejer, Yoshihisa Yamamoto
We report 10-ps correlated photon pair generation in periodically-poled reverse-proton-exchange lithium niobate waveguides with integrated mode demultiplexer at a wavelength of 1.5-υm and a clock of 10 GHz. Using superconducting single photon detectors, we

Subcentimeter depth resolution using a single-photon counting time-of-flight laser ranging system at 1550 nm wavelength

July 30, 2007
Author(s)
Ryan E. Warburton, Aongus McCarthy, Andrew M. Wallace, Sergio Hernandez-Marin, Robert Hadfield, Sae Woo Nam, Gerald S. Buller
We demonstrate subcentimeter depth profiling at a stand off distance of 330 m using a time-of-flight approach based on time-correlated single-photon counting. For the first time to our knowledge, the photon-counting time-of-flight technique was

Operational analysis of a quantum dot, optically gated, field-effect transistor as a single-photon detector

July 1, 2007
Author(s)
Eric Gansen, Mary A. Rowe, Marion Greene, Danna Rosenberg, Todd E. Harvey, Mark Su, Robert Hadfield, Sae Woo Nam, Richard Mirin
We report on the operation of a novel single-photon detector, where a layer of self-assembled quantum dots (QDs) is used as an optically addressable floating gate in a GaAs/Al0.2Ga0.8As Δ}-doped field-effect transistor. Photogenerated holes charge the QDs

Quantum key distribution over a 40-dB channel loss using superconducting single-photon detectors

June 1, 2007
Author(s)
Hiroki Takesue, Sae Woo Nam, Qiang Zhang, Robert Hadfield, Toshimori Honjo, Kiyoshi Tamaki, Yoshihisa Yamamoto
We report the first quantum key distribution (QKD) experiment to enable the creation of secure keys over 42 dB channel loss and 200 km of optical fibre. We used the differential phase shift QKD (DPS-QKD) protocol, implemented with a 10-GHz clock frequency

Photon-number-resolving capabilities of a semiconductor quantum dot, optically gated, field-effect transistor

May 6, 2007
Author(s)
Eric Gansen, Mary A. Rowe, Marion Greene, Danna Rosenberg, Todd E. Harvey, Mark Su, Robert Hadfield, Sae Woo Nam, Richard Mirin
We demonstrate the photon-number-resolving capabilities of a novel quantum dot, optically gated, field-effect transistor cooled to 4 K. Peaks are observed in the detector's response to highly attenuated laser pulses in accordance with Poisson statistics.

Resistance-Based Scaling of LF-and MF-Band Thermal Noise Powers

April 1, 2007
Author(s)
John Labenski, Weston L. Tew, Sae Woo Nam, Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
A conventional technique for scaling thermal noise power in Johnson Noise Thermometry (JNT) is via resistance ratios. We describe measurements in the low to medium frequency (LF/MF) bands using this approach via correlation methods in the frequency domain