  We present an oxide aperture microcavity with embedded quantum dots that
utilizes a three contact design to independently tune the quantum dot
wavelength and birefringence of the cavity modes. A polarization splitting
tuning of $\sim$5 GHz is observed. For typical microcavity polarization
splittings, the method can be used to achieve perfect polarization degeneracy
that is required for many polarization-based implementations of photonic
quantum gates. The embedded quantum dot wavelength can be tuned into resonance
with the cavity, independent of the polarization tuning.
