  Photonic-based qubits and integrated photonic circuits have enabled
demonstrations of quantum information processing (QIP) that promises to
transform the way in which we compute and communicate. To that end, sources of
polarization-entangled photon pair states are an important enabling technology,
especially for polarization-based protocols. However, such states are difficult
to prepare in an integrated photonic circuit. Scalable semiconductor sources
typically rely on nonlinear optical effects where polarization mode dispersion
(PMD) degrades entanglement. Here, we directly generate polarization-entangled
states in an AlGaAs waveguide, aided by the PMD and without any compensation
steps. We perform quantum state tomography and report a raw concurrence as high
as 0.91$\pm$0.01 observed in the 1100-nm-wide waveguide. The scheme allows
direct Bell state generation with an observed maximum fidelity of 0.90$\pm$0.01
from the 800-nm-wide waveguide. Our demonstration paves the way for sources
that allow for the implementation of polarization-encoded protocols in
large-scale quantum photonic circuits.
