Analyzing the collective emission of a Rydberg-blockaded single-photon source based on an ensemble of thermal atoms

An ensemble of rubidium atoms can be excited with lasers such that it evolves into an entangled state with just one collective excitation within the Rydberg-blockade radius. The decay of this state leads to the emission of a single antibunched photon. For a hot vapor of rubidium atoms in a microcell, we numerically study the feasibility of such a single-photon source under different experimental conditions like the atomic density distribution and the choice of electronic states addressed by the lasers. For the excitation process with three rectangular lasers pulses, we simulate the coherent dynamics of the system in a truncated Hilbert space. We investigate the radiative behavior of the moving rubidium atoms and optimize the laser pulse sequence accordingly. We find that the collective decay of the single excitation leads to a fast and directed photon emission and further that a pulse sequence similar to a spin echo increases the directionality of the photon. Finally, we analyze the residual double excitations and find that they do not exhibit these collective decay properties and play only a minor deleterious role

Hispania, Francia, Austrasia & Heluetia geographice historiceq[ue] tabulis aeneis delineatae : in qua singularum cuiusque prounciarum natura, caeli soliq[ue] constitutio, incolarum mores, civitatum oppidorumque nominis origines, & Provinciae cum externis

A Res. 77/3/0

Aramäische Pflanzennamen

Reprint of the 1881 ed.Mode of access: Internet

Der Westen Europas während der letzten Hälfte des Jahres 1830; oder, Geschichtliche Darstellung der wichtigen Vorgänge zu Paris, Brüssel und in mehreren Gegenden Deutschlands während dieser Zeit.

Mode of access: Internet

Emanuel Loew Hopf Collection 1820-1976

Legal documents and biographical information on Emanual Loew Hopf.Excerpt from the royal register of Jews in Rezat (Mittelfranken) region (1820).License to open kosher restaurant (1828).Biographical information regarding Loeb Hopf (1976).John H. Thaldigitize

Lexikalische Miszellen /

Text in German and English."Sonderabdruck aus Festschrift zum 70. Geburtstage D. Hoffmann's."Mode of access: Internet

Re-thinking the quality of public space (I)

Il volume raccoglie i seguenti saggi: Letteria G. Fassari, Martina Löw, Gioia Pompili e Emanuela Spanò Re-thinking the quality of public space (I) [Testo integrale] Dominik Bartmanski, Seonju Kim, Martina Löw, Timothy Pape e Jörg Stollmann Smart New World [Testo integrale] Ways of Seeing Spatiotemporal Logics of Social Refiguration in New Songdo City Paolo Do e Letteria G. Fassari The Quality of Public Space Among Hybrid Nature-Ruins [Testo integrale] The Case of Bullicante Lake in Rome Elifcan Karacan Quality of Space as Experienced: Impacts of Needs and Affordability on Spatial Appropriation of Cross-border Labor Commuters [Testo integrale] Alina Dambrosio Clementelli Women’s Safety Between Neo-Liberalization and Re-Writings of Public Spaces [Testo integrale] Séverine Marguin e Vivien Sommer Public Spaces as Homophilic Spaces [Testo integrale] Belonging and Accessibility in Berlin’s Club Culture Claudia Cantale Mapping Change [Testo integrale] Imagine Antico Corso: What Family Photo Archives Say About the Neighbourhoo

Re-thinking the quality of public space (II)

We present the second section of the special issue on rethinking the quality of public space from a sociological perspective. The primary objective is to observe the quality of public space in light of the changes and crises we have witnessed in previous decades through the analytical construct of refiguration (Knoblauch, Löw, 2017). Analyzing through refiguration has the advantage of capturing quality by considering the interdependence of structures, systems, levels and actions in maintaining multiscalar perspectives and subjective dimensions. The prevailing socio-spatial approach, partly oriented by the call itself, is based on the theory of relational space (Löw, 2016), which understands aspects of spatial ordering in processual, socio-material and discursive perspectives