  Exceptional points are complex-valued spectral singularities that lead to a
host of intriguing features such as loss-induced transparency - a
counterintuitive process in which an increase in the system's overall loss can
lead to enhanced transmission. In general, the associated enhancements scale
with the order of the exceptional points. Consequently, it is of great interest
to devise new strategies to implement realistic devices capable of exhibiting
high-order exceptional points. Here, we show that high-order N-photon
exceptional points can be generated by exciting non-hermitian waveguide
arrangements with coherent light states. Using photon-number resolving
detectors it then becomes possible to observe N-photon enhanced loss-induced
transparency in the quantum realm. Further, we analytically show that the
number-resolved dynamics occurring in the same nonconservative waveguide arrays
will exhibit eigenspectral ramifications having several exceptional points
associated to different sets of eigenmodes and dissipation rates.
