Robust quantum metrology in trapped Ba$^+$ ions to search for new physics

Summary

This project aims to develop a trapped-ion system for robust quantum metrology of entangled states. By engineering a quantum system that is insensitive to correlated noise, long coherence times can be reached to boost the measurement accuracy. These decoherence free states will be implemented in a two-ion crystal that consists of two different isotopes. In this manner, the isotope shift frequency can be extracted directly from the evolution of the entangled state. From these measurements, we will search for new ‘fifth force’ interactions between electrons and neutrons mediated by a hypothetical boson.