Cai ZHANG received his Ph.D. degree in Computer Science from Sun Yat-sen University, Guangzhou, in 2015. In the same year, he joined the College of Mathematics and Informatics, South China Agricultural University. From Aug. 2018 to Aug. 2019, he was a visiting researcher with the School of Electronic and Electrical Engineering, University of Leeds, UK.  His research interests include quantum cryptography and information security. He has published more than 20 papers in international journals.