期刊
NATURE PHYSICS
卷 9, 期 9, 页码 559-562出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS2705
关键词
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资金
- Austrian Science Fund (FWF) through the SFB FoQuS (FWF) [F4006-N16]
- Swiss NCCR 'Quantum Science and Technology'
- CHIST-ERA DIQIP
- European ERC-AG QORE
- Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA), through the Army Research Office [W911NF-10-1-0284]
Entanglement in a quantum system can be demonstrated experimentally by performing the measurements prescribed by an appropriate entanglement witness. However, the unavoidable mismatch between the implementation of measurements in practical devices and their precise theoretical modelling generally results in the undesired possibility of false-positive entanglement detection. Such scenarios can be avoided by using the recently developed device-independent entanglement witnesses (DIEWs) for genuine multipartite entanglement. Similarly to Bell inequalities, the only assumption of DIEWs is that consistent measurements are performed locally on each subsystem. No precise description of the measurement devices is required. Here we report an experimental test of DIEWs on up to six entangled Ca-40(+) C ions. We also demonstrate genuine multipartite quantum nonlocality between up to six parties with the detection loophole closed.
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