[1] Univ Aveiro, Dept Elect Informat & Telecommun, Aveiro, Portugal
[2] Univ Aveiro, Inst Telecomunicacoes, Aveiro, Portugal
[3] Wilfrid Laurier Univ, Waterloo, ON, Canada
[4] Shanghai Jiao Tong Univ, Ctr Integrated Quantum Informat Technol, Shanghai, Peoples R China