  Chiral quantum optics has attracted considerable interest in the field of
quantum information science. Exploiting the spin-polarization properties of
quantum emitters and engineering rational photonic nanostructures has made it
possible to transform information from spin to path encoding. Here, compact
chiral photonic circuits with deterministic circularly polarized chiral routing
and beamsplitting are demonstrated using two laterally adjacent waveguides
coupled with quantum dots. Chiral routing arises from the electromagnetic field
chirality in waveguide, and beamsplitting is obtained via the evanescent field
coupling. The spin- and position-dependent directional spontaneous emission are
achieved by spatially selective micro-photoluminescence measurements, with a
chiral contrast of up to 0.84 in the chiral photonic circuits. This makes a
significant advancement for broadening the application scenarios of chiral
quantum optics and developing scalable quantum photonic networks.
