Device-independent demonstration of genuine multipartite entanglement
Device-independent demonstration of genuine multipartite entanglement
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DOI：
10.1038/nphys2705
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
J. Barreiro;J. Bancal;P. Schindler;D. Nigg;M. Hennrich;T. Monz;N. Gisin;R. Blatt
中科院分区：
文献类型：
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作者：
J. Barreiro;J. Bancal;P. Schindler;D. Nigg;M. Hennrich;T. Monz;N. Gisin;R. Blatt
量子系统中的纠缠可以通过适当的纠缠见证所规定的测量来实验证明。然而，在实际设备中的测量的实施和它们的精确的理论建模之间的不可避免的失配通常导致不希望的假阳性纠缠检测的可能性。这种情况下，可以避免使用最近开发的设备无关的纠缠证人（DIEWs）的真正的多体纠缠。与Bell不等式类似，DIEW的唯一假设是在每个子系统上局部执行一致的测量。不需要对测量设备进行精确描述。在这里，我们报告了一个实验测试DIEWs上多达六个纠缠40Ca+离子。我们还证明了真正的多方量子非局域性之间的检测漏洞关闭多达六方。
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 entangled40Ca+ions. We also demonstrate genuine multipartite quantum nonlocality between up to six parties with the detection loophole closed.