Coherent Control of the Rotational Degree of Freedom of a Two-Ion Coulomb Crystal

We demonstrate the preparation and coherent control of the angular momentum state of a two-ion crystal. The ions are prepared with an average angular momentum of $7780\hbar$ freely rotating at 100~kHz in a circularly symmetric potential, allowing us to address rotational sidebands. By coherently exciting these motional sidebands, we create superpositions of states separated by up to four angular momentum quanta. Ramsey experiments show the expected dephasing of the superposition which is dependent on the number of quanta separating the states. These results demonstrate coherent control of a collective motional state described as a quantum rotor in trapped ions. Moreover, our work offers an expansion of the utility of trapped ions for quantum simulation, interferometry, and sensing

Coherent Control of the Rotational Degree of Freedom of a Two-Ion Coulomb Crystal.

We demonstrate the preparation and coherent control of the angular momentum state of a two-ion crystal. The ions are prepared with an average angular momentum of 7850ℏ freely rotating at 100 kHz in a circularly symmetric potential, allowing us to address rotational sidebands. By coherently exciting these motional sidebands, we create superpositions of states separated by up to four angular momentum quanta. Ramsey experiments show the expected dephasing of the superposition which is dependent on the number of quanta separating the states. These results demonstrate coherent control of a collective motional state described as a quantum rotor in trapped ions. Moreover, our Letter offers an expansion of the utility of trapped ions for quantum simulation, interferometry, and sensing

Data integration in the agronomic domain : national and international data discovery system

National audienceCurrent research in Agronomy has produced a vast amount of genomic, genetic and phenomic data. To deal with the Volume, Variety and Velocity of those data, it is necessary to first refine to candidate datasets through data discovery then to integrate them through semantic web technologies. Data discovery is an approach that allows to easily search for datasets based on keywords and metadata. The plant bioinformatic node of the Institut Français de Bioinformatique (IFB) gives access to several public information systems hosting domain specific data. It is composed of five bioinformatics platforms : the South Green platform, the LIPM platform, the Roscoff platform ABiMS, the platform for Arthopods for Agroecosystems Arthropods and the URGI platform. The later one plays a key role in several national an international projects like the Whea Initiative. Those platforms integrate several plant genomic, genetic and phenomic data, which they need to expose in data discovery and integration systems. The distributed data discovery system need an ETL (Extraction, Transformation and Loading) based integration pipeline implemented on each platform. This ETL can either be developed from scratch or be based on existing technologies such as KarmaWeb, Talend or Open Refine. The pipeline is being developed at the URGI, and will be deployed on all IFB plant nodes. The data discovery system is based on SolR (implemented in the Transplant portal http://www.transplantdb.eu) which uses the Lucene search framework at its core for full-text indexing. Here, we will present the data discovery system architecture and the ETL solutions evaluation and comparison. Work funded by IFB investment for the future infrastructure project, IFB_Plant node

Klassenspezifische Wahlabstinenz - Spielt das Vertrauen in politische Institutionen eine Rolle?

Hadjar A, Köthemann D. Klassenspezifische Wahlabstinenz - Spielt das Vertrauen in politische Institutionen eine Rolle? KZfSS Kölner Zeitschrift für Soziologie und Sozialpsychologie. 2014;66(1):51-76