By utilizing the quantum properties of nonclassical states of light novel imaging and sensing approaches can become feasible and exploitable for biomedical diagnostics and beyond. In doing so, one needs to investigate fundamental aspects as well as developing field deployable quantum sensing systems. One of the main pillars in this research direction are nonlinear interferometers, which allow quantum imaging and spectroscopy with undetected light. This way, sample interaction and the actual detection can be spectrally separated, and hence, sensing in extreme spectral ranges becomes feasible. Moreover, harnessing quantum correlations ghost imaging and microscopy can be implemented for improving signal-to-noise ratio in the low light regime of photosensitive bio-samples. In addition, improving the capabilities of microscopy schemes with the help of entangled or squeezed states of light is a promising path to follow.