56 research outputs found
Compact energy–time entanglement source using cascaded nonlinear interactions
No full textEntangled photon pair sources are essential for applications such as quantum communication and metrology. Here we present a compact energy–time entangled photon pair source at telecom wavelengths realized through cascaded second harmonic generation and spontaneous parametric down conversion in a single periodically poled lithium niobate waveguide. We introduce and characterize methods to diminish the effects of Raman scattering, the principal being quasi-CW pumping. The quality of energy–time entanglement produced by the compact source is analyzed using two-photon interference and Franson interference, and visibilities as high as 93.9% ± 0.4% and 90.5% ± 0.6% are achieved, respectively.Accepted Author ManuscriptQID/Tittel LabQuantum Communications La
The ‘Social’ and the ‘Cognitive’ in Language. A Reading of Saussure, and Beyond
No full textFranson Manjali, The ‘Social’ and the ‘Cognitive’ in Language. A Reading of Saussure, and Beyond, FMSH-WP-2012-15, july 2012. Pour télécharger ce Working Paper depuis HALSHS The author Professor at School of Language, Literature, and Cultural Studies, Jawaharlal Nehru University (JNU), New Delhi. Teaching at JNU since 1989. Prior to that, two years of post-doctoral research in Paris (Université Paris-4 Sorbonne and EHESS). Doctorate from Jawaharlal Nehru University in 1986. Franson Manjali wa..
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Dynamical mass of the young substellar companion HD 984 B
Get PDFModel-independent masses of substellar companions are critical tools to validate models of planet and brown dwarf cooling, test their input physics, and determine the formation and evolution of these objects. In this work, we measure the dynamical mass and orbit of the young substellar companion HD 984 B. We obtained new high-contrast imaging of the HD 984 system with Keck/NIRC2 which expands the baseline of relative astrometry from 3 to 8 years. We also present new radial velocities of the host star with the Habitable-Zone Planet Finder spectrograph at the Hobby-Eberly Telescope. Furthermore, HD 984 exhibits a significant proper motion difference between Hipparcos and Gaia EDR3. Our joint orbit fit of the relative astrometry, proper motions, and radial velocities yields a dynamical mass of 61 ± 4 M [subscript Jup] for HD 984 B, placing the companion firmly in the brown dwarf regime. The new fit also reveals a higher eccentricity for the companion (e = 0.76 ± 0.05) compared to previous orbit fits. Given the broad age constraint for HD 984, this mass is consistent with predictions from evolutionary models. HD 984 B’s dynamical mass places it among a small but growing list of giant planet and brown dwarf companions with direct mass measurementsAstronom
Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B
Get PDFDynamical masses of giant planets and brown dwarfs are critical tools for
empirically validating substellar evolutionary models and their underlying
assumptions. We present a measurement of the dynamical mass and an updated
orbit of PZ Tel B, a young brown dwarf companion orbiting a late-G member of
the Pic moving group. PZ Tel A exhibits an astrometric acceleration
between Hipparcos and Gaia EDR3, which enables the direct determination of the
companion's mass. We have also acquired new Keck/NIRC2 adaptive optics imaging
of the system, which increases the total baseline of relative astrometry to 15
years. Our joint orbit fit yields a dynamical mass of , semi-major axis of ,
eccentricity of , and inclination of
. The companion's mass is consistent within
of predictions from four grids of hot-start evolutionary models.
The joint orbit fit also indicates a more modest eccentricity of PZ Tel B than
previous results. PZ Tel joins a small number of young () systems with benchmark substellar companions that have dynamical
masses and precise ages from moving group membership.Comment: 14 pages, 5 figures, accepted to A
A Franson interferometer for broadband frequency-entangled photon pairs
No full textauthor: Luis Patrick Matheis, B.Sc.Masterarbeit University of Innsbruck 202
Relationship between domoic acid levels in the blue mussel (Mytilus-edulis) and toxicity in mice
No full textPT: J; CR: 1988, CAN CHEM NEWS, V10, P15 BATES SS, 1988, 57 NAT RES COUNC CAN BIRD CJ, 1988, 56 NAT RES COUNC CAN BRADFORD MM, 1976, ANAL BIOCHEM, V72, P248 COYLE JT, 1984, EXCITOTOXINS, V39, P112 DEBONNEL G, 1989, CAN J PHYSIOL PHARM, V67, P29 FRANSON MA, 1980, STANDARD METHODS EXA IMPELLIZZERI G, 1975, PHYTOCHEMISTRY, V14, P1549 LAWRENCE JF, 1989, J CHROMATOGR, V462, P349 LITCHFIELD JT, 1949, J PHARMACOL EXP THER, V96, P99 MAEDA M, 1987, PESTIC BIOCHEM PHYS, V28, P85 QUILLIAM MA, 1988, 55 NAT RES COUNC CAN RAO DVS, 1988, CAN J FISH AQUAT SCI, V45, P2076 TAKEMOTO T, 1958, CHEM PHARM BULL, V6, P578 TAKEMOTO T, 1978, KAINIC ACID TOOL NEU, P1 WILLIAMS S, 1984, OFFICIAL METHODS ANA, P344 WRIGHT JLC, 1989, CAN J CHEM, V67, P481; NR: 17; TC: 21; J9: TOXICON; PG: 8; GA: DF893Source type: Electronic(1
A Franson interferometer for broadband frequency-entangled photon pairs
No full textauthor: Luis Patrick Matheis, B.Sc.Masterarbeit University of Innsbruck 202
The economic cost of nonuse of occupant restraints in the United States: a preliminary analysis
Get PDFhttp://deepblue.lib.umich.edu/bitstream/2027.42/475/2/45138.0001.001.pd
Development of a parametric down-conversion source for two-photon absorption experiments
No full textWe describe a fiber-coupled parametric down-conversion (PDC) source designed for entanglement-enhanced twophoton absorption experiments. The key feature of the source is a narrowband (~1 MHz) UV diode pumping laser which can be tuned to match the energy of the 5S₁∕₂ to 5D₅∕₂ two-photon transition in Rubidium. The weak narrowband pumping beam is delivered to the PDC crystal through a single-mode fiber, which allows the source to be pre-aligned with a much stronger broadband auxiliary pump laser. The motivation for this PDC source lies within the context of Linear Optics Quantum Computing and Quantum Zeno Gates.The author gratefully acknowledges useful discussions with Jim Franson, Scott Hendrickson, and Bryan Jacobs. This work was supported in part by DTO-funded U.S. Army Research Office grant No. W911NF-05-1-0397.https://www.spiedigitallibrary.org/conference-proceedings-of-spie/6710/67100B/Development-of-a-parametric-down-conversion-source-for-two-photon/10.1117/12.734444.shor
Cooperative effort leads to water conservation
No full textPresented at Irrigation district sustainability - strategies to meet the challenges: USCID irrigation district specialty conference held on June 3-6, 2009 in Reno, Nevada.The West Side Combined Canals Salinity Project (Combined Canals) was a multi-million dollar combined irrigation project that met the needs of two irrigation companies and the Ute and Ouray Indian Tribes. The Bureau of Indian Affairs (BIA), the Uintah River Irrigation Company (URIC), and the Ouray Park Irrigation Company (OPIC) had historically competed over the limited Uinta River water supply. A steering committee made up of representatives from these groups met monthly over the past decade to oversee and direct the development of the Combined Canals. The project involved working together to create one large pressurized distribution system, rather than merely laying pipe in the existing alignments of the seven participating canals. A memorandum of understanding was produced that defined operation of the combined system. A Supervisory Control and Data Acquisition (SCADA) system was implemented to allow project participants to monitor water usage and water accounting. Each entity was able to realize an increased water supply, an increase which may have been economically infeasible if implemented as individual projects
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