“…Here, we consider a quantum polarization converter, which can function as a beam splitter and a router, or as a qubit for algorithms encoding information into spatial degrees of freedom of a photon. Previously, we proposed a five-level converter model based on a single-electron QD coupling to quantum fields of a two-mode MR and to a phonon mode, which was used as a mediator in the energy exchange between the electron and photon subsystems [12]. Below, we present an alternative conversion scheme, in which the mechanical degree of freedom does not participate, and weakening the selection rules for QD transitions that prevent the interaction of photons having different polarizations is achieved by rotating the QD and MR symmetry axes relative to each other.…”