期刊
NEW JOURNAL OF PHYSICS
卷 21, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/aaf8cf
关键词
mutually unbiased bases; symmetric informationally complete POVM; entanglement detection
资金
- ITRC (Information Technology Research Center) support program [IITP-2018-2018-0-01402]
- Institute for Information & communications Technology Promotion (IITP) - Korea government (MSIP) [R0190-17-2028]
- National Research Foundation of Korea [NRF-2017R1E1A1A03069961]
- KIST Institutional Program [2E26680-17-P025]
- People Programme (Marie Curie Actions) of the European Union Seventh Framework Programme (FP7/2007-2013) under REA [609305]
- Austrian Science Fund [FWF-P26783]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [663830]
We present an experimentally feasible and efficient method for detecting entangled states with measurements that extend naturally to a tomographically complete set. Our detection criterion for bipartite systems with equal dimensions is based on measurements from subsets of a quantum 2-design, e.g. mutually unbiased bases or symmetric informationally complete states, and has several advantages over standard entanglement witnesses. First, as more detectors in the measurement are applied, there is a higher chance of witnessing a larger set of entangled states, in such a way that the measurement setting converges to a complete setup for quantum state tomography. Secondly, our method is twice as effective as standard witnesses in the sense that both upper and lower bounds can be derived. Thirdly, the scheme can be readily applied to measurement-device-independent scenarios.
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