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Physics

Quantum information science

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Displaying 876 - 900 of 934

Ultra fast quantum key distribution over a 97-km installed telecom fiber with wavelength-division-multiplexing clock synchronization

July 21, 2008
Author(s)
Akihiro Tanaka, Mikio Fujiwara, Sae Woo Nam, Yoshihiro Nambu, Seigo Takahashi, Wakako Maeda, Ken-ichiro Yoshino, Shigehito Miki, Burm Baek, Z. Wang, Akio Tajima, Masahide Sasaki, Akihisa Tomita
We demonstrated ultra fast BB84 quantum key distribution (QKD) transmission at 625 MHz clock rate through a 97 km field-installed fiber using practical clock synchronization based on wavelength-division-multiplexing (WDM). We succeeded in over-one-hour

High-efficiency, ultra-low-noise all-fiber photon pair source

June 20, 2008
Author(s)
Shellee D. Dyer, Martin J. Stevens, Burm Baek, Sae Woo Nam
We demonstrate an all-fiber photon pair source with the highest coincidence-to-accidental ratio (CAR) reported to date in the fiber optic telecom C-band. We achieve this through careful optimization of pair production efficiency as well as careful

Designing high electron mobility transistor heterostructures with quantum dots for efficient, number-resolving photon detection

May 1, 2008
Author(s)
Mary A. Rowe, Eric Gansen, M. Greene, Danna Rosenberg, Todd E. Harvey, Mark Su, Robert Hadfield, Sae Woo Nam, Richard P. Mirin
We describe the design of the epitaxial layers for an efficient, photon-number-determining detector that utilizes a layer of self-assembled quantum dots as an optically addressable gate in a field-effect transistor. Our design features a dedicated

Distribution of time-energy entanglement over 100 km fiber using superconducting single-photon detectors

April 14, 2008
Author(s)
Qiang Zhang, Hiroki Takesue, Sae Woo Nam, Carston Langrock, Xiuping Xie, Burm Baek, Martin M. Fejer, Yoshihisa Yamamoto
In this letter, we report an experimental realization of distributing entangled photon pairs over 100 km of dispersion-shifted fiber. In the experiment, we used a periodically poled lithium niobate waveguide to generate the time-energy entanglement and

An Optical Fiber-Based Source of Polarization-Entangled Photon Pairs

September 10, 2007
Author(s)
Jingyun Fan, M D. Eisaman, Alan L. Migdall
We describe an achromatic, phase-stable, broadband source of polarization-entangled photon pairs with high spectral brightness that uses four-wave mixing in a fiber Sagnac interferometer. We achieved a polarization-entangled two-photon coincidence rate of

Custom Hardware to Eliminate Bottlenecks in QKD Throughput Performance

September 5, 2007
Author(s)
Alan Mink
The National Institute of Standards and Technology (NIST) high-speed quantum key distribution (QKD) system was designed to include custom hardware to support the generation and management of gigabit data streams. As our photonics improved our software

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

High Accuracy Dual Lens Transmittance Measurements

August 1, 2007
Author(s)
J Cheung, James Gardner, Alan L. Migdall, Sergey Polyakov, Michael Ware
We show how to determine the transmittance of short focal length lenses (f 19 mm, in this case) with an uncertainty of 1 part in 103 or better by measuring transmittances of lens pairs of a set of three or more lenses with the same nominal focal length

Controlled Exchange Interaction Between Pairs of Neutral Atoms in an Optical Lattice

July 26, 2007
Author(s)
M Anderlini, Patricia J. Lee, Ben L. Brown, Jennifer Sebby-Strabley, William D. Phillips, James V. Porto
Ultra-cold atoms trapped by light, with their inherent quantum coherence and controllability, provide an attractive system for quantum information and for the simulation of complex problems in condensed matter physics. Quantum information processing

Implementing a Multiplexed System of Detectors for Higher Photon Counting Rates

July 1, 2007
Author(s)
V Schettini, Sergey Polyakov, Ivo P. Degiovanni, Giorgio Brida, Stefania Castelletto, Alan L. Migdall
Photon counting applications are often limited by detector deadtime to operate at count rates of a few MHz, at best, and often at significantly lower levels. This limitation is becoming more critical as with the advance of photon counting applications such

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

A Broadband High Spectral Brightness Fiber-Based Two-Photon Source

March 19, 2007
Author(s)
Jingyun Fan, Alan L. Migdall
After characterizing the Raman scattering in a fused silica polarization-maintaining microstructure optical fiber, we built a fiber-based two-photon light source of high spectral brightness, broad spectral range, and very low noise background at room

Achieving Higher Photon Counting Rates Using Multiplexed Detectors

August 13, 2006
Author(s)
Stefania Castelletto, Ivo P. Degiovanni, Alan L. Migdall, Sergey Polyakov, V Schettini
As the quantum information field advances, the need for improved single-photon devices is becoming more critical. Quantum information systems are often limited by detector deadtime to count rates of a few MHz, at best. We present a multiplexed detection

Efficient generation of correlated photon pairs in a microstructure fiber

December 15, 2005
Author(s)
Jingyun Fan, Alan L. Migdall, L Wang
We report efficient generation of correlated photon pairs through degenerate four-wave mixing in a microstructure fiber. With 735.7 nm pump pulses producing correlated signal (688.5 nm) and idler (789.8 nm) photons in a 1.8 m microstructure fiber, we
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