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Quantum technologies

Dieter Meschede's research group
Home AMO physics colloquia
  • Prof. M. Prevedelli

  • Invited speaker: Prof. Marco Prevedelli
    Affiliation: Università di Bologna
    Title: Measuring the Gravitational Constant G With Atom Interferometry
    Time and room: 17:15, lecture hall IAP
    Abstract: The gravitational constant G is one of the oldest and yet the least precisely known fundamental physical constants. In spite of 2 centuries of experimental efforts systematic effects still seems to be unsolved problems. In the last 20 years atom interferometry has became a well established experimental technique for realizing sensitive and accurate inertial sensors. A measurement of G using atom interferometry aiming to 100ppm accuracy is in progress in Florence. The experiment combines standard techniques in laser cooling, sometimes with rather stringent requirements, with more unusual, for AMO physics, mechanical requirements. A general overview of the experiment and its present state will be given and few selected experimental problems will be described in deeper detail.
  • M. Karski's defense

  • PhD defense: MichaƂ Karski
    Title: State-selective transport of single neutral atoms
  • Prof. Jakob Reichel

  • Invited speaker: Prof. Jakob Reichel
    Affiliation: Laboratoire Kastler Brossel de l'ENS
    Title: Miniaturizing cavity QED with Fiber Fabry-Perot cavities
  • T. Kitagawa

  • Invited speaker: Takuya Kitagawa
    Affiliation: Havard University
    Title: Topology in dynamical systems: from quantum walk to graphene
    Abstract: Topological properties of physical systems such as integer quantum Hall systems and topological insulators have attracted attentions due to its universal aspect, where they are insensitive to the details of materials and robust against many perturbations. Such properties resulting from topology are not limited to static systems but extendable to dynamical quantum systems. In this talk, we study periodically driven dynamics and show that such dynamics can have topologically robust behaviors classified by two distinct topological invariants. We demonstrate that such topological properties can be dynamically induced by considering explicit examples with quantum walks and dynamics in graphene.
  • Dr. Eric Lutz

  • Invited speaker: Dr. Eric Lutz
    Affiliation: Universität Augsburg
    Title: Thermodynamics at the Nanoscale
    Time and room: 17 h c.t., lecture hall IAP
    Abstract: We present an overview of recent progress in the thermodynamic description of small systems, emphasizing the crucial role of thermal and quantum fluctuations. We discuss the importance of exact nonequilibrium relations (fluctuation theorem and Jarzynski equality) and their verifications using single-particle experiments. We finally focus on the quantum-mechanical definition of thermodynamic quantities, such as work and energy, and suggest a method to measure them in ultracold ion traps.