  In the quest for large-scale quantum computing, networked quantum computers
offer a natural path towards scalability. Now that nearest neighbor
entanglement has been demonstrated for electron spin qubits in semiconductors,
on-chip long distance entanglement brings versatility to connect quantum core
units. Here we realize the controlled and coherent transfer of a pair of
entangled electron spins, and demonstrate their remote entanglement when
separated by a distance of 6 microns. Driven by coherent spin rotations induced
by the electron displacement, high-contrast spin quantum interferences are
observed and are a signature of the preservation of the entanglement all along
the displacement procedure. This work opens the route towards fast on-chip
deterministic interconnection of remote quantum bits in semiconductor quantum
circuits.
