Moreau Paul-Antoine, Toninelli Ermes, Gregory Thomas, Aspden Reuben S, Morris Peter A, Padgett Miles J
School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK.
Sci Adv. 2019 Jul 12;5(7):eaaw2563. doi: 10.1126/sciadv.aaw2563. eCollection 2019 Jul.
The violation of a Bell inequality not only attests to the nonclassical nature of a system but also holds a very unique status within the quantum world. The amount by which the inequality is violated often provides a good benchmark on how a quantum protocol will perform. Acquiring images of such a fundamental quantum effect is a demonstration that images can capture and exploit the essence of the quantum world. Here, we report an experiment demonstrating the violation of a Bell inequality within observed images. It is based on acquiring full-field coincidence images of a phase object probed by photons from an entangled pair source. The image exhibits a violation of a Bell inequality with = 2.44 ± 0.04. This result both opens the way to new quantum imaging schemes based on the violation of a Bell inequality and suggests promise for quantum information schemes based on spatial variables.
违反贝尔不等式不仅证明了一个系统的非经典性质，而且在量子世界中具有非常独特的地位。不等式被违反的程度通常为量子协议的性能提供了一个很好的基准。获取这种基本量子效应的图像证明了图像能够捕捉和利用量子世界的本质。在这里，我们报告了一项实验，展示了在观测图像中违反贝尔不等式的情况。它基于获取由纠缠对源发出的光子探测的相位物体的全场符合图像。该图像显示贝尔不等式的违反程度为 = 2.44 ± 0.04。这一结果既为基于违反贝尔不等式的新量子成像方案开辟了道路，也为基于空间变量的量子信息方案带来了希望。
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