  We study the Rayleigh scattering induced by a diamond nanocrystal in a
whispering-gallery-microcavity--waveguide coupling system, and find that it
plays a significant role in the photon transportation. On one hand, this study
provides a new insight into future solid-state cavity quantum electrodynamics
toward strong coupling physics. On the other hand, benefitting from this
Rayleigh scattering, novel photon transportation such as dipole induced
transparency and strong photon antibunching can occur simultaneously. As
potential applications, this system can function as high-efficiency photon
turnstiles. In contrast to [B. Dayan \textit{et al.}, \textrm{Science}
\textbf{319},1062 (2008)], the photon turnstiles proposed here are highly
immune to nanocrystal's azimuthal position.
