Experimentally ruling out joint reality based on operational completeness

• URL: http://arxiv.org/abs/2203.05244v2
• Date: Sat, 3 Feb 2024 05:00:09 GMT
• Title: Experimentally ruling out joint reality based on operational completeness
• Authors: Qiuxin Zhang, Yu Xiang, Xiaoting Gao, Chenhao Zhu, Yuxin Wang, Liangyu Ding, Xiang Zhang, Shuaning Zhang, Shuming Cheng, Michael J. W. Hall, Qiongyi He, Wei Zhang
• Abstract summary: We report a device-independent experiment to confirm that the joint reality of two observables on a single two-level system is incompatible with the assumption of operational completeness. Our results push the fundamental limit to delineate the quantum-classical boundary and pave the way for exploring relevant problems in other scenarios.
• Score: 20.56996045100972
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Whether the observables of a physical system admit real values is of fundamental importance to a deep understanding of nature. In this work, we report a device-independent experiment to confirm that the joint reality of two observables on a single two-level system is incompatible with the assumption of operational completeness, which is strictly weaker than that of preparation noncontextuality. We implement two observables on a trapped $^{171}{\rm Yb}^{+}$ ion to test this incompatibility via violation of certain inequalities derived from both linear and nonlinear criteria. Moreover, by introducing a highly controllable dephasing channel, we show that the nonlinear criterion is more robust against noise. Our results push the fundamental limit to delineate the quantum-classical boundary and pave the way for exploring relevant problems in other scenarios.

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