Experimentally Robust Self-testing for Bipartite and Tripartite Entangled States
| Autor: | Zhibo Hou, Peng Yin, Ya Xiao, Xiang-Jun Ye, Guang-Can Guo, Ze-Di Cheng, Xing-Xiang Peng, Geng Chen, Yu-Chun Wu, Chuan-Feng Li, Wen-Hao Zhang, Jin-Shi Xu |
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| Rok vydání: | 2018 |
| Předmět: |
Discrete mathematics
Quantum Physics Bipartite system Computer science FOS: Physical sciences General Physics and Astronomy Quantum entanglement Quantum information processing 01 natural sciences 010309 optics Robustness (computer science) Bell's theorem 0103 physical sciences Bipartite graph Singlet state Quantum Physics (quant-ph) 010306 general physics Quantum |
| Zdroj: | Physical Review Letters. 121 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.121.240402 |
| Popis: | Self-testing is a method with which a classical user can certify the state and measurements of quantum systems in a device-independent way. In particular, self-testing of entangled states is of great importance in quantum information processing. An understandable example is that the maximal violation of the Clauser-Horne-Shimony-Holt inequality necessarily implies that the bipartite system shares a singlet. One essential question in self-testing is that, when one observes a nonmaximum violation, how far is the tested state from the target state (which maximally violates a certain Bell inequality)? The answer to this question describes the robustness of the used self-testing criterion, which is highly important in a practical sense. Recently, J. Kaniewski derived two analytic self-testing bounds for bipartite and tripartite systems. In this Letter, we experimentally investigate these two bounds with high-quality two-qubit and three-qubit entanglement sources. The results show that these bounds are valid for various entangled states that we prepared. Thereby, a proof-of-concept demonstration of robust self-testing is achieved, which improves on the previous results significantly. |
| Databáze: | OpenAIRE |
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