  We investigate the entanglement dynamics of two two-level emitters (qubits)
mediated by a semiinfinite, one-dimensional (1D) photonic waveguide. The
coupling of each qubit to the waveguide is chiral, which depends on the
propagation direction of light. The finite end of the waveguide is terminated
by a perfect mirror, such that coherent quantum feedback is introduced to the
system. We show that the chirally generated entanglement between the qubits can
be preserved by controlling the time delay of the feedback. Moreover, when the
time delay is negligible, the qubit-qubit reduced system evolves within the
strong-coupling regime and the qubits can be almost maximally entangled. We
also analyze the robustness of the protocol against variations of some relevant
parameters.
