Experimental Test of Contextuality based on State Discrimination with a Single Qubit

• URL: http://arxiv.org/abs/2206.10828v1
• Date: Wed, 22 Jun 2022 04:03:04 GMT
• Title: Experimental Test of Contextuality based on State Discrimination with a Single Qubit
• Authors: Qiuxin Zhang, Chenhao Zhu, Yuxin Wang, Liangyu Ding, Tingting Shi, Xiang Zhang, Shuaining Zhang, Wei Zhang
• Abstract summary: We extend the scope of experimental test of contextuality to a minimal quantum system of only two states (qubit) We observe a substantial violation of a no-go inequality derived by assuming non-contextuality. We also quantify the contextual advantage of state discrimination and the tolerance against quantum noises.
• Score: 16.530085733940528
• License: http://creativecommons.org/licenses/by/4.0/
• 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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