  Photonic losses pose a major limitation for implementation of quantum state
transfer between nodes of a quantum network. A measurement that heralds
successful transfer without revealing any information about the qubit may
alleviate this limitation. Here, we demonstrate heralded absorption of a single
photonic qubit generated by a single neutral quantum dot, by a single-electron
charged quantum dot that is located 5 meters away. The transfer of quantum
information to the spin degree of freedom takes place upon emission of a
photon: for a properly chosen or prepared quantum dot, detection of this photon
yields no information about the qubit. We show that this process can be
combined with local operations optically performed on the destination node, by
measuring classical correlations between the absorbed photon color and the
final state of the electron spin. Our work suggests alternative avenues for
realization of quantum information protocols based on cascaded quantum systems.
