Related Experiment Video
Updated: Jan 8, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Laser Cooling and Qubit Measurements on a Forbidden Transition in Neutral Cs Atoms
1University of Wisconsin-Madison, Department of Physics, Madison, Wisconsin 53706, USA.
Abstract:
We experimentally demonstrate background-free, hyperfine-level-selective measurements of individual Cs atoms by simultaneous cooling to 5.3 μK and imaging on the 6s_{1/2}→5d_{5/2} electric-quadrupole transition. We achieve hyperfine-resolved detection with fidelity 0.9993(4) and atom retention of 0.9954(5), limited primarily by vacuum lifetime. Performing state measurements in a 3D cooling configuration enables repeated low loss measurements. A theoretical analysis of an extension of the demonstrated approach, based on quenching of the excited state with an auxiliary field, identifies parameters for hyperfine-resolved measurements with a projected fidelity of ∼0.9995 in ∼60 μs.
Related Concept Videos
Atomic Spectroscopy: Effects of Temperature
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
Atomic Absorption Spectroscopy: Instrumentation
The atomizer used in AAS can be either a flame atomizer or an...
NMR Spectroscopy: Spin–Spin Coupling
Atomic Absorption Spectroscopy: Atomization Methods
Atomic Emission Spectroscopy: Instrumentation
Atomic Nuclei: Larmor Precession Frequency

