The main foe of quantum probes is noise. Noise limits the coherence of probes thus compromising their precision. In the field of quantum information processing a large effort has been dedicated to the mitigation of the effect of noise on quantum coherence. These methods are at the heart of fault-tolerant quantum computing. Examples include, dynamic decoupling protocols, decoherence-free-subspaces and quantum error-correction codes. In this talk I will show how methods that were developed in the context of quantum information processing can be used in order to improve on the precision of quantum measurements, and the implementation of these methods on a trapped-ion quantum register. I will show how dynamic decoupling methods were used for precision magnetometry [1,2], light shifts spectroscopy , sensitive force measurements  and the detection of an atomic quadrupole moment . I’ll show how a decoherence-free subspace was used to detect the magnetic interaction between two electrons . Finally I’ll describe Heisenberg limited optical clock spectroscopy in correlated subspaces such as quantum error correction codes . If time permits, I will describe a new proposal to measure or bound new forces using precision isotope shift measurements in optical atomic clock transitions .
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