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Detection and quantification of entanglement with measurement-device-independent and universal entanglement witness |
| Zhi-Jin Ke(柯芝锦)1,2, Yi-Tao Wang(王轶韬)1,2, Shang Yu(俞上)1,2, Wei Liu(刘伟)1,2, Yu Meng(孟雨)1,2, Zhi-Peng Li(李志鹏)1,2, Hang Wang(汪航)1,2, Qiang Li(李强)1,2, Jin-Shi Xu(许金时)1,2, Ya Xiao(肖芽)3, Jian-Shun Tang(唐建顺)1,2, Chuan-Feng Li(李传锋)1,2, Guang-Can Guo(郭光灿)1,2 |
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
2 CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
3 Department of Physics, Ocean University of China, Qingdao 266100, China |
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Abstract Entanglement is the key resource in quantum information processing, and an entanglement witness (EW) is designed to detect whether a quantum system has any entanglement. However, prior knowledge of the target states should be known first to design a suitable EW, which weakens this method. Nevertheless, a recent theory shows that it is possible to design a universal entanglement witness (UEW) to detect negative-partial-transpose (NPT) entanglement in unknown bipartite states with measurement-device-independent (MDI) characteristic. The outcome of a UEW can also be upgraded to be an entanglement measure. In this study, we experimentally design and realize an MDI UEW for two-qubit entangled states. All of the tested states are well-detected without any prior knowledge. We also show that it is able to quantify entanglement by comparing it with concurrence estimated through state tomography. The relation between them is also revealed. The entire experimental framework ensures that the UEW is MDI.
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Received: 15 January 2020
Revised: 22 April 2020
Accepted manuscript online:
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PACS:
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03.67.-a
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(Quantum information)
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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42.50.Ex
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(Optical implementations of quantum information processing and transfer)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0302700), the National Natural Science Foundation of China (Grant Nos. 11674304, 11822408, 11774335, 61490711, 11474267, 11821404, and 91321313), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2017492), the Foundation for Scientific Instrument and Equipment Development of Chinese Academy of Sciences (Grant No. YJKYYQ20170032), the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant No. QYZDY-SSW-SLH003), and the Fundamental Research Funds for the Central Universities, China (Grant No. WK2470000026). |
Corresponding Authors:
Jian-Shun Tang, Chuan-Feng Li
E-mail: tjs@ustc.edu.cn;cfli@ustc.edu.cn
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Cite this article:
Zhi-Jin Ke(柯芝锦), Yi-Tao Wang(王轶韬), Shang Yu(俞上), Wei Liu(刘伟), Yu Meng(孟雨), Zhi-Peng Li(李志鹏), Hang Wang(汪航), Qiang Li(李强), Jin-Shi Xu(许金时), Ya Xiao(肖芽), Jian-Shun Tang(唐建顺), Chuan-Feng Li(李传锋), Guang-Can Guo(郭光灿) Detection and quantification of entanglement with measurement-device-independent and universal entanglement witness 2020 Chin. Phys. B 29 080301
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