Experimental test of the irreducible four-qubit Greenberger-Horne-Zeilinger paradox

Experimental test of the irreducible four-qubit Greenberger-Horne-Zeilinger paradox
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不可约四量子位 Greenberger-Horne-Zeilinger 悖论的实验测试

DOI:
10.1103/physreva.95.030103
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发表时间:
2016-11
期刊:
影响因子:
2.9
通讯作者:
Jian-Wei Pan
Jian-Wei Pan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zu-En Su;Wei-Dong Tang;Dian Wu;Xin-Dong Cai;Tao Yang;Li Li;Nai-Le Liu;Chao-Yang Lu;Marek ˙ Zukowski;Jian-Wei Pan

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贝尔定理在统计预测的层面上显示了局域实在论和量子力学之间的深刻矛盾。它不直接涉及Einstein-Podolsky-罗森(EPR)关联。格林伯格-霍恩-蔡林格悖论(Greenberger-Horne-Zeilinger,GHZ)以EPR相关性为基础,以全对无的方式直接否定了EPR实在元素的概念。近20年前,GHZ悖论的三个量子位的实验演示已经完成,随后是更多量子位的演示。尽管如此,测试背后的GHZ矛盾可以减少到三个量子比特。提出了一个不可约的四量子比特GHZ佯谬,并给出了实验证明。减刑的漏洞被堵住了。每方三个设置Bell-GHZ不等式的界被$7\sigma$违反。GHZ态的保真度约为81\%$,并且纠缠证人揭示了19\sigma $的可分性阈值的违反。
Bell's theorem shows a profound contradiction between local realism and quantum mechanics on the level of statistical predictions. It does not involve directly Einstein-Podolsky-Rosen (EPR) correlations. The paradox of Greenberger-Horne-Zeilinger (GHZ) disproves directly the concept of EPR elements of reality, based on the EPR correlations, in an all-versus-nothing way. A three-qubit experimental demonstration of the GHZ paradox was achieved nearly twenty years ago, and followed by demonstrations for more qubits. Still, the GHZ contradictions underlying the tests can be reduced to three-qubit one. We show an irreducible four-qubit GHZ paradox, and report its experimental demonstration. The reducibility loophole is closed. The bound of a three-setting per party Bell-GHZ inequality is violated by $7\sigma$. The fidelity of the GHZ state was around $81\%$, and an entanglement witness reveals a violation of the separability threshold by $19\sigma$.
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