  Integrated quantum photonics hold the promise to scale up the system size and
form an on-chip quantum network with distributed information processing and
simulation units. An outstanding need of such quantum network is to have high
fidelity and efficiency on-chip state transfer between distant nodes. Although
the nodes are naturally connected via waveguides, it is challenging to fulfill
this need because stringent conditions such as spatial mode-matching
configuration and time-reversal symmetry have to be satisfied. Here we report a
type of quantum photonic nodes consisting of single quantum emitters and
cascaded microring resonators for on-chip state transfer. By interfacing the
node with a waveguide, we show that all the emission from the node can be
funneled into the waveguide and its temporal profile can be synthesized to be
time-reversal symmetric. We demonstrate theoretically on-chip quantum state
transfer between two distant nodes with near-unity overall success rate can be
achieved without any dynamic control. Moreover, we discuss the experimental
implementation of our scheme with CMOS compatible integrated photonic platforms
and solid-state quantum optics techniques.
