Group Seminar at MPQ and via Zoom: Cavity assisted autonomous spin feedback

July 14, 2022

Kevin Mours, University of California, Berkeley
Group Seminar at MPQ in the Herbert-Walther-Lecture Hall and via zoom
Thursday, July 14, 9.00 am (MEZ)


A reliable, flexible and repeatable method for quantum state preparation is crucial for all experiments in ultracold physics and can be achieved by autonomous stabilization of quantum systems. In this talk, I will present our recent results on stabilizing the collective spin of an atomic ensemble using the toolbox of spin optodynamics. The dispersive coupling between the atoms and the cavity light field offers sensitivity to the longitudinal and transverse spin components by applying a magnetic field at an angle to the cavity axis. Coherent backaction from this measurement, influenced by the cavity density of states, can then be used to stabilize the collective spin state at an arbitrary energy.In a second part of the talk, I'm introducing my simulations of a single atom quantum refrigerator based on spin exchange collisions. Single Cesium atoms are used as "fuel" in an Otto cycle in an ultracold bath of Rubidium. I establish a rate model to later on calculate the relevant figures of merit which foresee an outstanding performance.

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