  We demonstrate quantum interference of three photons that are distinguishable
in time, by resolving them in the conjugate parameter, frequency. We show that
the multiphoton interference pattern in our setup can be manipulated by tuning
the relative delays between the photons, without the need for reconfiguring the
optical network. Furthermore, we observe that the symmetries of our optical
network and the spectral amplitude of the input photons are manifested in the
interference pattern. Moreover, we demonstrate time-reversed HOM-like
interference in the spectral correlations using time-bin entangled photon
pairs. By adding a time-varying dispersion using a phase modulator, our setup
can be used to realize dynamically reconfigurable and scalable boson sampling
in the time domain as well as frequency-resolved multiboson correlation
sampling.
