Centre for Quantum Technology;
School of Chemistry and Physics;
University of KwaZulu-Natal;
Durban;
South Africa;
Department of Physics and Astronomy;
Botswana International University of Science and Technology;
Palapye;
Botswana;
National Institute for Theoretical Physics (NITheP);
University of KwaZulu-Natal;
Durban;
South Africa;
Quantum; Key; Distribution; QKD; Symmetric; Protocol; Six-State; Quantum; PBC00; Optical; Implementation;