The Michelson interferometric phase detection resolution can be enhanced by replacing conventional beam splitters with novel directionally unbiased four-port scatterers, such as Grover coins. We present a quantitative analysis of the noise-to-signal ratio of sideband frequencies generated by gravitational wave-induced phase perturbations in a Grover-Michelson interferometer (GMI). We discuss the principles of GMI signal enhancement and demonstrate how combining this configuration with additional light-recycling arrangements further enhances the performance.
@article{arxiv.2512.08638,
title = {Strain sensitivity enhancement in a Grover-Michelson interferometer},
author = {Anthony D. Manni and Christopher R. Schwarze and David S. Simon and Abdoulaye Ndao and Alexander V. Sergienko},
journal= {arXiv preprint arXiv:2512.08638},
year = {2025}
}