Fan Xuan, Xiao Ya, Gu Yongjian
Opt Express. 2023 Dec 18;31(26):42764-42784. doi: 10.1364/OE.502723.
Universal contextuality is the leading notion of non-classicality even for single systems, showing its advantage as a more general quantum correlation than Bell non-locality, as well as preparation contextuality. However, a loophole-free experimental demonstration of universal contextuality at least requires that both operational inequivalence and compatibility loopholes are closed, which have never been simultaneously achieved to date. In our work, we experimentally test universal contextuality through (3,3) and (4,3) communication games, simultaneously restoring operational equivalence and circumventing the compatibility loophole. Our result exhibits the violation of universal non-contextuality bound by 97 standard deviations in (3,3) scenario, and 107 deviations in (4,3) scenario. Notably there are states which exhibit locality but reveal universal contextuality in both two scenarios. In addition, our result shows that universal contextuality is more general than preparation contextuality in (3,3) scenario, while equivalent to preparation contextuality in (4,3) scenario.
即使对于单个系统而言，全域情境性也是非经典性的主要概念，它作为一种比贝尔非定域性以及制备情境性更为普遍的量子关联，展现出自身的优势。然而，对全域情境性进行无漏洞的实验证明至少需要同时消除操作不等价漏洞和兼容性漏洞，而迄今为止这两者从未同时实现过。在我们的工作中，我们通过（3,3）和（4,3）通信博弈对全域情境性进行了实验测试，同时恢复了操作等价性并规避了兼容性漏洞。我们的结果显示，在（3,3）情境中违反全域非情境性界限达97个标准差，在（4,3）情境中达107个标准差。值得注意的是，存在一些态在这两种情境中都表现出定域性但却揭示了全域情境性。此外，我们的结果表明，在（3,3）情境中全域情境性比制备情境性更为普遍，而在（4,3）情境中与制备情境性等效。
