Institute of Signal Processing Transmission;
Nanjing University of Posts and Telecommunications;
Nanjing 210003;
China;
Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of the Ministry of Education;
Nanjing University of Posts and Telecommunications;
Nanjing 210003;
China;
Department of Physics;
Southeast University;
Nanjing 211189;
China;
quantum key distribution; reference-frame-independent; statistical fluctuations; source errors;