  Biexciton cascade process in self-assembled quantum dots (QDs) provides an
ideal system for deterministic entangled photon pair source, which is essential
in quantum information science. The entangled photon pairs have recently be
realized in experiments after eliminating the FSS of exciton using a number of
different methods. However, so far the QDs entangled photon sources are not
scalable, because the wavelengths of the QDs are different from dot to dot.
Here we propose a wavelength tunable entangled photon emitter on a three
dimensional stressor, in which the FSS and exciton energy can be tuned
independently, allowing photon entanglement between dissimilar QDs. We confirm
these results by using atomistic pseudopotential calculations. This provides a
first step towards future realization of scalable entangled photon generators
for quantum information applications.
