par Hu, Xiao Min;Xie, Yi;Arora, Atul Singh 
;Ai, Ming Zhong;Bharti, Kishor;Zhang, Jie;Wu, Wei;Chen, Ping Xing;Cui, Jin Ming;Liu, Bi Heng;Huang, Yun Feng;Li, Chuan Feng;Guo, Guang Can;Roland, Jérémie ;Cabello, Adán;Kwek, Leong Chuan
Référence npj Quantum Information, 9, 1, 103
Publication Publié, 2023-12
;Ai, Ming Zhong;Bharti, Kishor;Zhang, Jie;Wu, Wei;Chen, Ping Xing;Cui, Jin Ming;Liu, Bi Heng;Huang, Yun Feng;Li, Chuan Feng;Guo, Guang Can;Roland, Jérémie ;Cabello, Adán;Kwek, Leong ChuanRéférence npj Quantum Information, 9, 1, 103
Publication Publié, 2023-12
Article révisé par les pairs
| Résumé : | Self-testing allows one to characterise quantum systems under minimal assumptions. However, existing schemes rely on quantum nonlocality and cannot be applied to systems that are not entangled. Here, we introduce a robust method that achieves self-testing of individual systems by taking advantage of contextuality. The scheme is based on the simplest contextuality witness for the simplest contextual quantum system—the Klyachko-Can-Binicioğlu-Shumovsky inequality for the qutrit. We establish a lower bound on the fidelity of the state and the measurements as a function of the value of the witness under a pragmatic assumption on the measurements. We apply the method in an experiment on a single trapped 40Ca+ using randomly chosen measurements and perfect detection efficiency. Using the observed statistics, we obtain an experimental demonstration of self-testing of a single quantum system. |
