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Quantum technologies

Dieter Meschede's research group
Home AMO physics colloquia
  • Roman Schnabel

  • Invited speaker: Prof. Roman Schnabel
    Affiliation: Universität Hannover
    Title: Towards Nonclassical Systems of Massive Objects
    Time and room: 17:15 lecture hall IAP
    The theory of quantum mechanics is an extremely successful theory but does not as yet include gravity. A possible step towards a unified theory of quantum gravity might be the addition of the (nonrelativistic) Newtonian theory to quantum mechanics, and check whether such a modified theory predicts nontrivial effects that can be tested in an experiment. Several proposals were made in the past. Recently, it was shown that the Schrödinger-Newton equation predicts a quantum state evolution different from that described by the standard Schrödinger equation  [1]. An experimental test might be feasible by using a massive mirror that is suspended as a high-Q pendulum, similar to those used in gravitational wave detectors. This talk proposes the experimental realisation of such a system on the basis of kilogram-scale fibre-suspended mirrors. The mechanical states envisioned include squeezed states as well as Einstein-Podolsky-Rosen entangled states of centre-of-mass motions.

    [1] H. Yang, H. Miao, Da-shin Lee, B. Helou, and Y Chen, Macroscopic Quantum Mechanics in a Classical Spacetime, Phys. Rev. Lett. 110, 170401 (2013).


  • Klas Lindfors

  • Invited speaker: Prof. Klas Lindfors
    Affiliation: Universität zu Köln
    Title: Controlling Light With Optical Antennas
    Time and room: 17:15 lecture hall IAP
    Abstract: Plasmon resonant metal nanoparticles enable controlling optical fields on the nanoscale. In analogy to the radio frequency domain such particles are often called optical antennas. They have led to a multitude of breakthroughs in, e.g., enhancement of light emission and radiation engineering of single photons, as well as in sensing. I will present the results of our work on using optical antennas to enhance the optical properties of single self-assembled quantum dots and to realize optical point-to-point links. Coupling a quantum emitter to the antenna allows us to enhance both its absorption efficiency as well as emission rate. Meanwhile, point-to-point links based on optical antennas are a promising concept to transmit optical signals between nano-objects. I will show the first realization of such a link.

  • Marc Bienert

  • Invited speaker: Dr. Marc Bienert
    Affiliation: Universität des Saarlandes
    Title: Wielding The Photonic Tool: Controlling Atoms In Cavities
    Time and room: 17:15 lecture hall IAP
    Abstract: The scattering of photons at a single atom can serve for both
    manipulation and readout of the atomic quantum state. If the atom is
    placed in an optical resonator, the reshaped mode structure of the
    quantized light field allows to enhance certain scattering pathes. This
    can be exploited for improved cooling schemes relying on quantum
    interference. Moreover, from the properties of the scattered light,
    information about the motional quantum state can be inferred. I review
    the basic ideas of cavity cooling of single atoms and theoretically
    discuss the role of interferences of scattering pathes leading to
    enhanced cooling. Furthermore, I present the spectral properties of the
    emitted light from the cavity for differently shaped trapping
    potentials. The analysis of the spectral form allows to deduce the
    temperature of the cooled atom.


  • Antoine Georges

  • Invited speaker: Prof. Antoine Georges
    Affiliation: Collège de France, Paris
    Title: Quantum Matter From Hot Superconductors To Cold Atoms
    Time and room: 17:15 h, Kleiner Hörsaal Mathematik, Wegelerstraße 10

  • Antoine Georges

  • Invited speaker: Prof. Antoine Georges
    Affiliation: Collège de France, Paris
    Title: The Coolest Transport: Ultra-Cold Atomic Gases Meet Mescoscopics And Thermoelectrics
    Time and room: Monday, 15:15 h,  lecture hall IAP

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