  We demonstrate controlled entanglement routing between bunching and
antibunching path-entangled two-photon states in an unbalanced Mach-Zehnder
interferometer (UMZI), in which the routing process is controlled by the
relative phase difference in the UMZI. Regarding bunching and antibunching
path-entangled two-photon states as two virtual ports, we can consider the UMZI
as a controlled entanglement router, which bases on the coherent manipulation
of entanglement. Half of the entanglement within the input two-photon state is
coherently routed between the two virtual ports, while the other is lost due to
the time distinguishability introduced by the UMZI. Pure bunching or
antibunching path entangled two-photon states are obtained based on this
controlled entanglement router. The results show that we can employ the UMZI as
general entanglement router for practical quantum information application.
