Abstract
Photonic quantum sensing is attracting attention since it outperforms photonic sensing with classical
light. Here we present photonic quantum sensing that harnesses the quantum properties of not only light
source but also measurement system. First, we introduce nonlinear interferometer as an approach to introduce
quantum properties to measurement system, and then show our proposal and the theoretical results
of a loss tolerant quantum absorption measurement. We also show photonic quantum sensing,
which enables us to detect ultra-faint signal light at a photon counting level under huge noisy environments.
We also discuss the future directions and challenges of photonic quantum sensing using the
quantum properties of measurement system, including applications to microscopy and spectroscopy.
