Experimental composable secure key rate in COW QKD system. - Vivek Kumar; Ayan Biswas; Prasanta Halder; Arka Mukherjee; Akriti Katiyar; Prashant Kumar Rathore; Atul Kumar Gupta; Pankaj Kumar Dalela; Rajkumar Upadhyay (Quantum Inf. Process., 2026)