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- Title
Experimental demonstration of robust self-testing for bipartite entangled states.
- Authors
Zhang, Wen-Hao; Chen, Geng; Yin, Peng; Peng, Xing-Xiang; Hu, Xiao-Min; Hou, Zhi-Bo; Zhou, Zhi-Yuan; Yu, Shang; Ye, Xiang-Jun; Zhou, Zong-Quan; Xu, Xiao-Ye; Tang, Jian-Shun; Xu, Jin-Shi; Han, Yong-Jian; Liu, Bi-Heng; Li, Chuan-Feng; Guo, Guang-Can
- Abstract
Quantum entanglement is the key resource for quantum information processing. Device-independent certification of entangled states is a long standing open question, which arouses the concept of self-testing. The central aim of self-testing is to certify the state and measurements of quantum systems without any knowledge of their inner workings, even when the used devices cannot be trusted. Specifically, utilizing Bell's theorem, one can infer the appearance of certain entangled state when the maximum violation is observed, e.g., to self-test singlet state using CHSH inequality. In this work, by constructing a versatile entanglement source, we experimentally demonstrate a generalized self-testing proposal for various bipartite entangled states up to four dimensions. We show that the high-quality generated states can approach the maximum violations of the utilized Bell inequalities, and thus, their Schmidt coefficients can be precisely inferred by self-testing them into respective target states with near-unity fidelities. Our results indicate the superior completeness and robustness of this method and promote self-testing as a practical tool for developing quantum techniques. Quantum state testing: certifying entanglement without assumptions on the apparatus Certifying entanglement, and even fully characterizing some quantum states, can be done even with devices that we don't trust. Chuan-Feng Li and coworkers from University of Science and Technology of China (Hefei) have devised an improved method for quantum "self-testing", meaning characterizing properties of quantum states (in particular entanglement, the notorious "spooky" quantum correlation) without assuming fully-correct functioning of the measurement apparatus, but based only on the measurements' violation of mathematical inequalities that can happen only for specific quantum states. Li's method was also tested experimentally on entangled photons, proving one of its main strengths: robustness with respect to imperfections. Self-testing would allow to strengthen even more the capabilities of quantum techniques for intrinsically-secure communication based on entanglement.
- Publication
NPJ Quantum Information, 2019, Vol 5, Issue 1, pN.PAG
- ISSN
2056-6387
- Publication type
Article
- DOI
10.1038/s41534-018-0120-0