<?xml version="1.0" encoding="UTF-8" ?><rss version="2.0"><channel><title>Talks &amp; Seminars at IQOQI</title><link>http://iqoqi.at/rss/events</link><description>IQOQI RSS</description><lastBuildDate>Wed, 10 Mar 2010 18:54:09 +0100</lastBuildDate><generator>APM RSS GEN</generator><managingEditor>christian.flatz@uibk.ac.at (Christian Flatz)</managingEditor><webMaster>valentin.staubmann@oeaw.ac.at (Valentin Staubmann)</webMaster><item><title><![CDATA[Measuring the Superfluid Fraction of an Ultracold Atomic Gas]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Central to the understanding of the physics of degenerate Bose gases are the concepts of Bose-Einstein condensation and superfluidity. Both phenomena admit clear quantitative definitions, allowing a Bose gas to be characterised by ``condensate'' and ``superfluid'' fractions. For ultra-cold atomic Bose gases, the condensate fraction is readily measured through the mapping of occupation numbers in momentum space to real space by expansion imaging.  While characteristic signatures of superfluidity have been observed in atomic gases, there has been no quantitative measurement of the superfluid fraction. In this talk, I will describe how the superfluid fraction of an atomic gas can be measured using a light-induced vector potential. The proposed method is closely analogous to the classic experimental method of Andronikashvili for measuring the superfluid fraction of liquid helium.<br />Start Date: Mon, 08 Mar 2010 11:00:00 +0100]]></description><pubDate>Mon, 22 Feb 2010 12:13:59 +0100</pubDate><guid isPermaLink="false">iqoqi_event_613</guid></item><item><title><![CDATA[Quantum Optics in Wavelength Scale Structures]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Quantum Optics in Wavelength Scale Structures<br />Start Date: Fri, 05 Mar 2010 16:00:00 +0100]]></description><pubDate>Fri, 05 Mar 2010 10:31:45 +0100</pubDate><guid isPermaLink="false">iqoqi_event_621</guid></item><item><title><![CDATA[informal talk on cold fermions]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[informal talk on cold fermions<br />Start Date: Fri, 05 Mar 2010 14:30:00 +0100]]></description><pubDate>Fri, 05 Mar 2010 11:33:01 +0100</pubDate><guid isPermaLink="false">iqoqi_event_622</guid></item><item><title><![CDATA[Light with a Twist - Ray Aspects in Singular Wave and Quantum Optics]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[We study the spatial structure, physical properties and quantum dynamics of coherent optical modes with twisted and rotating boundary conditions. Our characterization of such modes is exact up to leading order of the paraxial approximation and involves pairs of bosonic ladder operators in the spirit of the quantum-mechanical harmonic oscillator, which connect modes of different order. Although the ladder operators act in the wave-optical domain, their transformation through an optical set-up can be expressed in terms of a ray matrix, which describes the transformation of a ray through the same set-up and has a purely geometric significance. We discuss various geometric aspects such as the rotational stabilization and destabilization of an optical cavity and the geometric origin of generalized Gouy phase shifts.<br />Start Date: Thu, 04 Mar 2010 11:00:00 +0100]]></description><pubDate>Wed, 03 Mar 2010 12:33:37 +0100</pubDate><guid isPermaLink="false">iqoqi_event_620</guid></item><item><title><![CDATA[Generating functional and spin glass analyses of minority games]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Generating functional and spin glass analyses of minority games<br />Start Date: Mon, 01 Mar 2010 15:00:00 +0100]]></description><pubDate>Thu, 25 Feb 2010 13:46:31 +0100</pubDate><guid isPermaLink="false">iqoqi_event_619</guid></item><item><title><![CDATA[informal blackboard talk]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[informal blackboard talk<br />Start Date: Thu, 18 Feb 2010 14:00:00 +0100]]></description><pubDate>Thu, 18 Feb 2010 11:30:43 +0100</pubDate><guid isPermaLink="false">iqoqi_event_612</guid></item><item><title><![CDATA[Noise Correlations and Coherent Coupling in Solid State Qubits]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[In this seminar I will present recent advances in the fields of quantum transport and and hybrid quantum systems. The former has incorporated a theory of counting statistics to investigate high-order current correlations through nanoscopic conductors. These can reveal valuable information such as coherence times and phase transitions. In particular, I will apply the theory to investigate the fluctuation-dissipation theorem in situations out of equilibrium and also show how a non-Markovian description becomes essential to study quantum noise. In the second part, I will review some proposals that combine solid-state and quantum-optics systems in the context of quantum information processing. I shall present a hybrid system consisting on a flux qubit coupled to an ensemble of NV centers in diamond. At high densities coherent transfer between both systems becomes possible, and therefore this opens the possibility of interfacing superconducting qubits with light<br />Start Date: Thu, 18 Feb 2010 11:00:00 +0100]]></description><pubDate>Wed, 17 Feb 2010 11:26:43 +0100</pubDate><guid isPermaLink="false">iqoqi_event_610</guid></item><item><title><![CDATA[Celebrating 10 years of atom chips]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Celebrating 10 years of atom chips<br />Start Date: Thu, 18 Feb 2010 09:00:00 +0100]]></description><pubDate>Wed, 17 Feb 2010 11:30:37 +0100</pubDate><guid isPermaLink="false">iqoqi_event_611</guid></item><item><title><![CDATA[Moessbauer spectroscopy for investigation of thermal defects  in Fe-Mn alloys]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Moessbauer spectroscopy for investigation of thermal defects  in Fe-Mn alloys<br />Start Date: Thu, 11 Feb 2010 17:00:00 +0100]]></description><pubDate>Tue, 09 Feb 2010 17:02:16 +0100</pubDate><guid isPermaLink="false">iqoqi_event_609</guid></item><item><title><![CDATA[Multivalued Fields and Phase Transitions]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Multivalued Fields and Phase Transitions<br />Start Date: Mon, 08 Feb 2010 14:00:00 +0100]]></description><pubDate>Tue, 19 Jan 2010 11:22:48 +0100</pubDate><guid isPermaLink="false">iqoqi_event_588</guid></item><item><title><![CDATA[Quantum Tomographic Reconstruction with Error Bars: a Kalman Filter Approach]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[e present a novel quantum tomographic reconstruction method based on Bayesian inference via the Kalman filter update equations. The method not only yields the maximum likelihood/optimal Bayesian reconstruction, but also a covariance matrix expressing the measurement uncertainties in a complete way. From this covariance matrix the error bars on any derived quantity can be easily calculated. This is a first step towards the broader goal of devising an omnibus reconstruction method that could be adapted to any tomographic setup with little effort and that treats measurement uncertainties in a statistically well-founded way. We restrict ourselves to the important subclass of tomography based on measurements with discrete outcomes (as opposed to continuous ones), and we also ignore any measurement imperfections (dark counts, less than unit detector efficiency, etc.), which are treated elsewhere. We illustrate the general theory on two real tomography experiments of quantum optical information processing elements.<br />Start Date: Fri, 05 Feb 2010 15:00:00 +0100]]></description><pubDate>Tue, 02 Feb 2010 09:56:42 +0100</pubDate><guid isPermaLink="false">iqoqi_event_607</guid></item><item><title><![CDATA[Universal few-body and many-body physics in mixed dimensions]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Universal few-body and many-body physics in mixed dimensions<br />Start Date: Thu, 04 Feb 2010 09:15:00 +0100]]></description><pubDate>Tue, 02 Feb 2010 14:03:05 +0100</pubDate><guid isPermaLink="false">iqoqi_event_608</guid></item><item><title><![CDATA[Rydberg atoms served hot and cold]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[The coherent control of mesoscopic ensembles of atoms and Rydberg atom
blockade are the basis for proposed quantum devices such as integrable
gates and single photon sources. So far, experimental progress has been
limited to complex experimental setups that use ultracold atoms. We have
been able to gain some insight in the evolution of strongly interacting
Rydberg gases with ultracold gases. Especially the observation of an
universal scaling behavior is an evidence for the existence of a second
order quantum phase transition. In the second part I will show that
coherence times of 100 ns are achievable with coherent Rydberg atom
spectroscopy in micron sized thermal vapor cells. This is a first step
towards atom based devices at room temperature for various quantum
information applications.<br />Start Date: Tue, 02 Feb 2010 11:00:00 +0100]]></description><pubDate>Tue, 26 Jan 2010 10:29:26 +0100</pubDate><guid isPermaLink="false">iqoqi_event_589</guid></item><item><title><![CDATA[Information Complementarity in Bipartite Quantum Systems]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Information Complementarity in Bipartite Quantum Systems<br />Start Date: Mon, 01 Feb 2010 17:00:00 +0100]]></description><pubDate>Wed, 27 Jan 2010 18:38:58 +0100</pubDate><guid isPermaLink="false">iqoqi_event_591</guid></item><item><title><![CDATA[Workshop:Quantum devices with limited control]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Workshop:Quantum devices with limited control<br />Start Date: Thu, 28 Jan 2010 10:00:00 +0100]]></description><pubDate>Tue, 26 Jan 2010 15:31:18 +0100</pubDate><guid isPermaLink="false">iqoqi_event_590</guid></item><item><title><![CDATA[Fast cooling schemes]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Fast cooling schemes<br />Start Date: Tue, 26 Jan 2010 15:00:00 +0100]]></description><pubDate>Thu, 28 Jan 2010 13:19:33 +0100</pubDate><guid isPermaLink="false">iqoqi_event_602</guid></item><item><title><![CDATA[Searching for Massless Dirac Fermions in Flatland]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Searching for Massless Dirac Fermions in Flatland<br />Start Date: Wed, 20 Jan 2010 15:00:00 +0100]]></description><pubDate>Thu, 28 Jan 2010 13:16:33 +0100</pubDate><guid isPermaLink="false">iqoqi_event_600</guid></item><item><title><![CDATA[SIC'ing the Shape of Quantum-State Space]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[SIC'ing the Shape of Quantum-State Space<br />Start Date: Mon, 18 Jan 2010 14:00:00 +0100]]></description><pubDate>Thu, 28 Jan 2010 13:12:34 +0100</pubDate><guid isPermaLink="false">iqoqi_event_599</guid></item><item><title><![CDATA[The phase diagrams of strongly interacting ultracold atoms]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[The phase diagrams of strongly interacting ultracold atoms<br />Start Date: Thu, 14 Jan 2010 13:00:00 +0100]]></description><pubDate>Mon, 11 Jan 2010 10:24:13 +0100</pubDate><guid isPermaLink="false">iqoqi_event_587</guid></item><item><title><![CDATA[Quanteneffekte in der Alltagswelt?]]></title><link><![CDATA[http://iqoqi.at/events]]></link><description><![CDATA[Vortrag anlässlich der Verleihung des Loschmidt-Preises 2009 durch die Chemisch-Physikalischen Gesellschaft an Dr. Johannes Kofler<br />Start Date: Tue, 12 Jan 2010 17:00:00 +0100]]></description><pubDate>Thu, 28 Jan 2010 13:09:39 +0100</pubDate><guid isPermaLink="false">iqoqi_event_598</guid></item></channel></rss>