Experimental Demonstration of Input-Output Indefiniteness in a Single Quantum Device Yu Guo ,1,2,3 ,*Zixuan Liu,4,5,*Hao Tang,1,2,3Xiao-Min Hu,1,2,3Bi-Heng Liu,1,2,3 ,?Yun-Feng Huang,1,2,3 Chuan-Feng Li,1,2,3 ,?Guang-Can Guo,1,2,3and Giulio Chiribella4,6,5,7 ,§ 1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China 2CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 2...