1Department of Physics, Renmin University of China, Beijing 100872, China 2Beijing Academy of Quantum Information Sciences, Beijing 100193, China 3Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China
Abstract：Exploring quantum phenomena beyond predictions of any classical model has fundamental importance to understand the boundary of classical and quantum descriptions of nature. As a typical property that a quantum system behaves distinctively from a classical counterpart, contextuality has been studied extensively and verified experimentally in systems composed of at least three levels (qutrit). Here we extend the scope of experimental test of contextuality to a minimal quantum system of only two states (qubit) by implementing the minimum error state discrimination on a single $^{171}$Yb$^+$ ion. We observe a substantial violation of a no-go inequality derived by assuming non-contextuality, and firmly conclude that the measured results of state discrimination cannot be reconciled with any non-contextual description. We also quantify the contextual advantage of state discrimination and the tolerance against quantum noises.
. [J]. 中国物理快报, 2022, 39(8): 80301-.
Qiuxin Zhang, Chenhao Zhu, Yuxin Wang, Liangyu Ding, Tingting Shi, Xiang Zhang, Shuaining Zhang, and Wei Zhang. Experimental Test of Contextuality Based on State Discrimination with a Single Qubit. Chin. Phys. Lett., 2022, 39(8): 80301-.
Jerger M, Reshitnyk Y, Oppliger M, Potočnik A, Mondal M, Wallraff A, Goodenough K, Wehner S, Juliusson K, Langford N K and Fedorov A 2016 Nat. Commun.7 12930
2022, Vol. 39 
