The reduction of the number of incoherent Kraus operations for qutrit systems Jiahuan Qiao, Lingyun Sun, Jing Wang, Ming Li, Shuqian Shen, Lei Li and Shaoming Fei EPL, 129 6 (2020) 60006 Published online: 27 April 2020 DOI: 10.1209/0295-5075/129/60006