Polarization-based quantum logic gates using anisotropic excitonic media

The low symmetry of Group VII transition metal dichalcogenides (TMDs) confers to them intricate anisotropic optical and electronic properties. Rhenium disulfide (ReS₂), a material belonging to this family, exhibits two kinds of bright in-plane excitons with linearly polarized transition dipole moments nearly orthogonal to each other, as evidenced from their polarized photoluminescence emission [1]. In this work, we discuss the potential of using such a pair of anisotropic exciton species and the inherent polarization mixing found in biaxial crystals to realize quantum logic gates for photon polarization-based qubits. Such a system offers a new path to easily integrable quantum processing devices.



[1] A. Dhara, D. Chakrabarty, P. Das, A. K. Pattanayak, S. Paul, S. Mukherjee, and S. Dhara, Additional Excitonic Features and Momentum-Dark States in ReS2, Phys. Rev. B 102, 161404 (2020).