  The entanglement distribution network connects remote users through sharing
entanglement resources, which is essential for realizing quantum internet. We
proposed a controllable entanglement distribution network (c-EDN) based on a
silicon quantum photonic chip. The entanglement resources were generated by a
quantum light source array based on spontaneous four-wave mixing (SFWM) in
silicon waveguides and distributed to different users through time-reversed
Hong-Ou-Mandel interferences in on-chip Mach-Zehnder interferometers with
thermal phase shifters. A chip sample was designed and fabricated, supporting a
c-EDN with 3 subnets and 24 users. The network topology of entanglement
distributions could be reconfigured in three network states by controlling the
quantum interferences through the phase shifters, which was demonstrated
experimentally. Furthermore, a reconfigurable entanglement-based QKD network
was realized as an application of the c-EDN. The reconfigurable network
topology makes the c-EDN suitable for future quantum networks requiring
complicated network control and management. Moreover, it is also shows that
silicon quantum photonic chips have great potential for large-scale c-EDN,
thanks to their capacities on generating and manipulating plenty of
entanglement resources.
