Quantum Optics Seminar: Klemens Hammerer, University of Hannover

Tailored states and measurements for frequency metrology

Optical atomic clocks based on cold trapped ions or cold atoms in tweezer arrays or optical lattices offer the possibility to use the sophisticated tools of quantum control developed for quantum information processing for new protocols in frequency metrology. I will present the prospects and challenges faced by the use of entangled states and measurements in frequency metrology. I will show the results of quantum variational optimizations of Ramsey protocols, which turn out surprisingly different depending on which decoherence processes (such as laser noise or spontaneous emission) dominate. These efforts contribute to improving the quality of precision measurements for fundamental tests of physics, especially the dynamics of quantum matter in gravitational fields.