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-.
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