Professor Dr. Florian Schreck, University of Amsterdam, Netherlands, about:
Continuous Bose-Einstein condensation and superradiant clocks
Ultracold quantum gases are excellent platforms for quantum simulation and sensing. So far these gases have been produced using time-sequential cooling stages and after creation they unfortunately decay through unavoidable loss processes. This limits what can be done with them. For example it becomes impossible to extract a continuous-wave atom laser, which has promising applications for precision measurement through atom interferometry. I will present how we achieve continuous Bose-Einstein condensation and create condensates (BECs)that persist in a steady-state for as long as we desire. Atom loss is compensated by feeding fresh atoms from a continuously replenished thermal source into the BEC by Bose-stimulated gain. Our experiment is the matter wave analog of a cw optical laser with fully reflective cavity mirrors. The only step missing to create acontinuous-wave atom laserbeamis the addition of a coherent atom outcoupling mechanism. In addition this BEC may give us access to interesting driven-dissipative quantum phenomena over unprecedented timescales. The techniques we developed to achieve the continuous source of thermal atoms are also nicely suited to tackle another challenge: the creation of a continuously operating superradiant clock. These clocks promise to become more rugged and/or more short-term stable than traditional optical clocks, thereby opening new application areas. In thesecond part of my talk I will present how we are developing two types of superradiant clocks within the European Quantum Flagship consortium iqClock.
The pretalk will be given by Karthik Chandrashekara, Physikalisches Institut, Universität Heidelberg: "Towards dipolar quantum gases in 2D – Current status and future prospects of the Heidelberg Dy experiment". more ...