  Large-scale quantum information processing networks will most probably
require the entanglement of distant systems that do not interact directly. This
can be done by performing entangling gates between standing information
carriers, used as memories or local computational resources, and flying ones,
acting as quantum buses. We report the deterministic entanglement of two remote
transmon qubits by Raman stimulated emission and absorption of a traveling
photon wavepacket. We achieve a Bell state fidelity of 73 %, well explained by
losses in the transmission line and decoherence of each qubit.
