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FM: Fall Meeting
FM 30: Quantum Sensing: Applications I
FM 30.2: Talk
Dienstag, 24. September 2019, 14:30–14:45, Aula
Single-atom quantum probes for ultracold gases using nonequilibrium spin dynamics — Quentin Bouton1, •Jens Nettersheim1, Daniel Adam1, Tobias Lausch1, Daniel Mayer1, Felix Schmidt1, Eberhard Tiemann2, and Artur Widera1 — 1Department of Physics and Research Center OPTIMAS Technische Universität Kaiserslautern, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany
Quantum probes are atomic-sized devices mapping information of their environment to quantum mechanical states. By improving measurements and at the same time minimizing perturbation of the environment, they form a central asset for quantum technologies. Here, we present a realization of single-atom quantum probes for local thermometry based on the spin dynamic of individual neutral Caesium (probe) atoms in an ultracold gas (bath) of Rubidium atoms. The competition of inelastic endo- and exoergic spin-exchange processes map the temperature onto the quasi-spin population of the probe. The sensitivity of the thermometer can be adjusted via the external magnetic field changing the Zeeman energy splitting. Sensitivity can also be enhanced, if temperature information is obtained from the nonequilibrium dynamic, instead of the steady-state distribution, of the probe, maximizing the information obtained per inelastic collision and thus minimizing the perturbation of the bath. Moreover, our probe is not restricted to measure temperature, but it allows sensing any mechanism affecting the total collisional energy in a spin-exchange collision, such as the magnetic field.