  We demonstrate a comparison of different multiplexing architectures based on
quantum detector tomography. Using the purity of their measurement outcomes, we
gain insight about the photon-number resolving power of the devices. Further,
we calculate the information each measurement outcome can extract out of a
Hilbert space with given dimension. Our work confirms that more multiplexing
outcomes enable higher photon-number resolving power; however, the splitting
between those outcomes must be optimized as well.
