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Experimental Test of Contextuality Based on State Discrimination with a Single Qubit |
| Qiuxin Zhang1, Chenhao Zhu1, Yuxin Wang1, Liangyu Ding1, Tingting Shi1, Xiang Zhang1,2, Shuaining Zhang1,2*, and Wei Zhang1,2,3* |
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
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| Cite this article: |
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Qiuxin Zhang, Chenhao Zhu, Yuxin Wang et al 2022 Chin. Phys. Lett. 39 080301 |
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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.
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Received: 04 May 2022
Editors' Suggestion
Published: 16 July 2022
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| PACS: |
03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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42.50.Dv
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(Quantum state engineering and measurements)
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03.65.Aa
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(Quantum systems with finite Hilbert space)
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