Σεμινάριο, 1 Ιουνίου 2016, 1:00 μ.μ.]

*Trends in Quantum Technologies : Cooling many particles at once***   Dr Almut Beige Reader, School of Physics and Astronomy, University of Leeds, UK

Single trapped atomic particles at nanoKelvin temperatures are one of the most promising candidates for quantum technological applications, like quantum computing,in the nearer future. Indeed trapped ions already provide the most accurate frequency standards; their signals are responsible for the extremely high precision of atomic clocks. In this talks, we have a closer look at the quantum physics, which allows us to cool single trapped ions so close to absolute zero. First we discuss how to model single laser-driven atomic systems with spontaneous photon emission using quantum trajectory methods and quantum optical master equations. Afterwards, we apply those techniques to standard laser sideband cooling techniques. Finally, we propose a cavity-mediated collective laser cooling scheme to transfer an atomic gas inside an asymmetric trap in a cyclic two-stage process to a final temperature, which vanishes in the infinitely-many-particle limit.

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