Experimental Test of Generalized Hardy's Paradox

Abstract

Since the pillars of quantum theory were established, it was already noted that quantum physics may allow certain correlations defying any local realistic picture of nature, as first recognized by Einstein, Podolsky and Rosen. These quantum correlations, now termed quantum nonlocality and tested by violation of Bell's inequality that consists of statistical correlations fulfilling local realism, have found loophole-free experimental confirmation. A more striking way to demonstrate the conflict exists, and can be extended to the multipartite scenario. Here we report experimental confirmation of such a striking way, the multipartite generalized Hardy's paradoxes, in which no inequality is used and the conflict is stronger than that within just two parties. The paradoxes we are considering here belong to a general framework [S.-H. Jiang \emph{et al.}, Phys. Rev. Lett. 120, 050403 (2018)], including previously known multipartite extensions of Hardy's original paradox as special cases. The conflict shown here is stronger than in previous multipartite Hardy's paradox. Thus, the demonstration of Hardy-typed quantum nonlocality becomes sharper than ever.

arXiv comment5 pages, 1 figure, and 2 tables

References in corpus (12)

• Significant-loophole-free test of Bell's theorem with entangled photons
• Multi-photon entanglement and interferometry
• A strong loophole-free test of local realism
• Experimental ten-photon entanglement
• Witnessing multipartite entanglement
• Experimental joint weak measurement on a photon pair as a probe of Hardy's Paradox
• Toolbox for entanglement detection and fidelity estimation
• Hardy's nonlocality for generalized n-particle GHZ states
• Hardy's paradox and violation of a state-independent Bell inequality in time
• Hardy's Paradox for High-Dimensional Systems: Beyond Hardy's Limit
• Generalized Hardy's Paradox
• Testing Hardy nonlocality proof with genuine energy-time entanglement