Article
Significant loophole-free test of Kochen-Specker contextuality using two species of atomic ions
Author/s | Wang, Pengfei
Zhang, Junhua Luan, Chun-Yang Um, Mark Wang, Ye Qiao, Mu Xie, Tian Zhang, Jing-Ning Cabello Quintero, Adán Kim, Kihwan |
Department | Universidad de Sevilla. Departamento de Física Aplicada II |
Publication Date | 2022-02-09 |
Deposit Date | 2023-07-21 |
Published in |
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Abstract | Quantum measurements cannot be thought of as revealing preexisting results, even when they do not disturb any other measurement in the same trial. This feature is called contextuality and is crucial for the quantum advantage ... Quantum measurements cannot be thought of as revealing preexisting results, even when they do not disturb any other measurement in the same trial. This feature is called contextuality and is crucial for the quantum advantage in computing. Here, we report the observation of quantum contextuality simultaneously free of the detection, sharpness, and compatibility loopholes. The detection and sharpness loopholes are closed by adopting a hybrid two-ion system and highly efficient fluorescence measurements offering a detection efficiency of 100% and a measurement repeatability of >98%. The compatibility loophole is closed by targeting correlations between observables for two different ions in a Paul trap, a 171Yb+ ion and a 138Ba+ ion, chosen so measurements on each ion use different operation laser wavelengths, fluorescence wavelengths, and detectors. The experimental results show a violation of the bound for the most adversarial noncontextual models and open a way to certify quantum systems. |
Funding agencies | National Natural Science Foundation of China European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) Ministerio de Economia, Industria y Competitividad (MINECO). España Guangdong Basic and Applied Basic Research Foundation |
Project ID. | 2016YFA0301900
2016YFA0301901 92065205 11974200 US-15097 CI2019-111885-2 2019A1515111135 2019B030330001 |
Citation | Wang, P., Zhang, J., Luan, C., Um, M., Wang, Y., Qiao, M.,...,Kim, K. (2022). Significant loophole-free test of Kochen-Specker contextuality using two species of atomic ions. Science Advances, 8(6) (abk1660). https://doi.org/10.1126/sciadv.abk1660. |
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