Realization of the Contextuality-Nonlocality Tradeoff with a Qubit-Qutrit Photon Pair
Xiang Zhan, Xin Zhang, Jian Li, Yong-Sheng Zhang, Barry Cyril Sanders, Peng Xue · Physical Review Letters · 2016
We report our experimental results on the no-disturbance principle, which imposes a fundamental monogamy relation on contextuality versus nonlocality. We employ a photonic qutrit-qubit hybrid to explore no-disturbance monogamy at the quantum boundary spanned by noncontextuality and locality inequalities. In particular, we realize the single point where the quantum boundary meets the no-disturbance boundary. Our results agree with quantum theory and satisfy the stringent monogamy relation thereby providing direct experimental evidence of a tradeoff between locally contextual correlations and spatially separated correlations. Thus, our experiment provides evidence that entanglement is a particular manifestation of a more fundamental quantum resource.