  Essential for building quantum networks over remote independent nodes, the
indistinguishability of photons has been extensively studied by observing the
coincidence dip in the Hong-Ou-Mandel interferometer. However,
indistinguishability is not limited to the same type of bosons. For the first
time, we hereby observe quantum interference between flying photons and a
single quantum of stored atomic coherence (magnon) in an atom-light beam
splitter interface. We demonstrate that the Hermiticity of this interface
determines the type of quantum interference between photons and magnons.
Consequently, not only the bunching behavior that characterizes bosons is
observed, but counterintuitively, fermionlike antibunching as well. The hybrid
nature of the demonstrated magnon-photon quantum interface can be applied to
versatile quantum memory platforms, and can lead to fundamentally different
photon distributions from those occurring in boson sampling.
