CoQuS Colloquium - Carsten Klempt


Make sure to visit the CoQuS colloquium on the 21st of November with guest speaker Carsten Klempt from Leibniz Universität Hannover!

The Vienna Doctoral Programme on Complex Quantum Systems

invites you to a

Seminar Talk

Carsten Klempt
Leibniz Universität Hannover

Quantum atom optics with spinor Bose-Einstein condensates

The creation of coherent particle pairs provides a basic method for the creation of highly nonclassical quantum states. In optics, photon pairs can be created by optical parametric down-conversion, allowing for a large variety of fascinating quantum optics experiments. In our experiments, we study nonclassical quantum states in a Bose-Einstein condensate (BEC) of ultracold Rubidium atoms with a spin degree of freedom.  In such a condensate, two atoms may collide and produce an entangled atom pair with two different internal states. This process is perfectly analogous to optical parametric down-conversion. In this talk, I will present the realization of two classic quantum optics experiments – with coherent atomic matter waves. The first part comprises a demonstration of the Quantum Zeno Effect which was originally proposed but never realized with photons. The setup can be used for an interaction-free measurement, where a classical object is detected without interacting with it. In the second part, I will present the creation of a many-particle state that is entangled in the sense of Einstein, Podolsky and Rosen (EPR).  For the first time with massive particles, the measured correlations fulfill the continuous-variable EPR criterion.


Monday, 21 November 2016,
16:30h get-together with coffee and snacks!
Lise Meitner Hörsaal, Strudlhofgasse 4, 1st floor, Vienna


The seminar talk will be preceded by a CoQuS Student talk at 17:00h


Christian Knobloch
University of Vienna

Tailored gratings for matter-wave diffraction


Hosted by:  Jörg Schmiedmayer