Quantum States Investigated for Enhanced Optical Interferometry

A new preprint on arXiv details research into using Gottesman-Kitaev-Preskill (GKP) states to improve optical interferometry. The paper analyzes phase sensitivity in SU(2) and SU(1,1) interferometers, comparing GKP-enhanced setups with conventional quantum configurations. This work demonstrates a direct application of finite-energy GKP states and offers a method for estimating quantum Fisher information, potentially advancing quantum sensing.