4,872 research outputs found
Advanced interferometry and entanglement measurement of quantum light from GaAs quantum dots
No full textFür Anwendungen im Bereich der Quanten-Information, Prozessierung und Kommunikation werden Qubits mit hoher Ununterscheidbarkeit und hohem Verschränkungsgrad benötigt. In dieser Arbeit untersuchen und besprechen wir die Eigenschaften von Qubits in der Form von Photonen, die von optisch angeregten GaAs Quantenpunkten emittiert werden. Wir beleuchten die zeitabhängige Verbreiterung der Emission-Linien und beschreiben die Messung dieser durch die Methode der Photonen-Korrelations-Fourier-Spektroskopie (PCFS), deren Ergebnisse wir mit den Messungen von Michelson- und Fabry-Perot-Interferometrie vergleichen. Diese zeitliche Entwicklung der Linienbreite vergleichen wir weiters mit der Ununterscheidbarkeit von aufeinanderfolgend emittierten Photonen durch den Hong-Ou-Mandel (HOM) Aufbau für unterschiedliche Zeitverzögerungen. Dabei zeigen wir die Messungen einer Probe, welche bis in den Bereich von Mikrosekunden keine Änderung der HOM Sichtbarkeit aufweist. Diese Quantenpunkte sind daher vielversprechend mögliche Quellen von Qubits in Quantum-Netzwerken. Wir besprechen weiters die Möglichkeit, mit GaAs Quantenpunkten hoch verschränkte Photonenzustände zu erzeugen, welche durch verschiedene Faktoren, insbesondere der Temperatur, den Grad der Verschränkung ändern.Applications in quantum-information, -processing and -communication require high degrees of indistinguishability and entanglement of the used qubits. In this thesis, we investigate and discuss the properties of qubits in the form of photons emitted from optically excited GaAs quantum dots. We look into the time-dependent broadening of the emission linewidth and how it can be measured using the photon-correlation-Fourier-spectroscopy (PCFS) technique, and compare the results with Michelson- and Fabry-Perot interferometry measurements. Further we connect the time evolution of the linewidth to the indistinguishability of consecutively emitted photons using the Hong-Ou-Mandel (HOM) setup for different time delays between the photons and demonstrate a sample where the HOM interference visibility remains unaltered up to the microseconds scale. These quantum dots are therefore promising candidates as sources for quantum networks. We also discuss the possibility to create highly entangled photon pairs using from GaAs quantum dots sources and how the degree of entanglement changes with with temperature, among other factors.Author Gabriel Undeutsch, BScMasterarbeit Universität Linz 202
Gabriel Ajak Lat
No full textabstract: Gabriel was ten years old when he left his village.
“Lost Boys Found” is an ongoing, interdisciplinary project that is collecting, recording and archiving the oral histories of the Lost Boys/Girls of Sudan. The collection is a work-in-progress, seeking to record the oral history of as many Lost Boys/Girls as are willing, and will be used in a future book.Age: 27Region: Bahr al GhazalThis picture and bio was donated to the Lost Boys Found project from The Arizona Lost Boys Cente
Providence College Faculty Author Series 2013-2014: Fr. Gabriel Pivarnik
No full textIn this installment, Fr. Gabriel Pivarnik discusses his book Toward a Trinitarian Theology of Liturgical Participation and his reflections on the history of active participation within the Catholic Church
Providence College Faculty Author Series 2013-2014: Fr. Gabriel Pivarnik
No full textIn this installment, Fr. Gabriel Pivarnik discusses his book Toward a Trinitarian Theology of Liturgical Participation and his reflections on the history of active participation within the Catholic Church
Manuscript Poem "John Keats" by Dante Gabriel Rossetti
No full textabstract: Concerning the manuscript for "John Keats".Publication Details: Not the same version as some published versions of "John Keats."Curator's Note: Handwriting in upper right corner reads "Rossetti's Handwriting." Writing on verso reads "Dante Gabriel Rossetti. Mss.
British Museum Reader's Ticket of Dante Gabriel Rossetti
No full textabstract: Concerning a Reader's Ticket of Dante Gabriel Rossetti.Transcription Details: Card reads:
Poet's article 8 {? Nap.} /661
{?dilk Gllucci}
Aug 10 DG RossettiCreation Date Details: Undated range is the author's lifespan. Date and month listed on ticket read "Aug 10.
GaAs quantum dots grown by droplet etching epitaxy as quantum light sources
No full textThis Perspective presents an overview on the epitaxial growth and optical properties of GaAs quantum dots obtained with the droplet etching method as high-quality sources of quantum light. We illustrate recent achievements regarding the generation of single photons and polarization entangled photon pairs and the use of these sources in applications of central importance in quantum communication such as entanglement swapping and quantum key distribution. (C) 2021 Author(s)
Suplemento 32. Gabriel Moedano Navarro. 75 (2005) abril. Diario de Campo. Boletín Interno de los investigadores del área de Antropología
No full text- Gabriel Moedano Navarro un hombre de su tiempo por Benjamín Muratalla. - Gabriel Moedano explorador gozoso de inframundos por Andrés Medina Hernández. - Hasta pronto, Gabriel por Jesús Montoya. - Homenaje a Gabriel Moedano por Cristina Barros. - Gabriel Moedano, el amigo por Jesús Monjarás Ruiz. - A Gabriel por Amparo Sevilla. - Algunas remembranzas en torno al maestro Gabriel Moedano por Norma Lazcano Arce. - Gabriel Moedano por Marco Buenrostro. - Gabriel Moedano por Katrin S. Flechsig. - A mi maestro con cariño por Yolanda Torres Martínez. - Corazón gigante por María Cristina Díaz Pérez
Open Doors presents, Nasario Garcia, E. A. Mares, Gabriel Melendez, and Jane Young
No full textThe Open Doors series presents a conversation about writing on New Mexican culture with Nasario Garcia, author of ""Brujas, Bultos y Brazaz: Tales of witchcraft and the supernatural in the Pecos Valley,"" E. A. Mares, author of ""Padre Martinez: a new perspective on Taos,"" and Gabriel Melendez and Jane Young, co-authors of ""Multicultural Southwest: A Reader."
The public and private faces of the friendship between Fidel Castro and Gabriel Garcia Marquez
No full textNobel Prize-winning Colombian author, Gabriel Garcia Marquez, is one of the most widely read Latin American authors in the world. His novels One Hundred Years of Solitude and Love in the Time of Cholera are among many people’s favourite books. But, despite loving his books, many of his readers have found it difficult to understand his political views – especially his support and friendship for the recently deceased former president of Cuba, Fidel Castro
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