二维六方氮化硼扩展量子理论的灵敏单光子实验
Sensitive single-photon test of extended quantum theory with 2D hexagonal boron nitride
摘要：
量子理论是现代物理学的基础。然而，它的一些基本原理，如玻恩法则，是基于需要实验检验的假设。任何偏离玻恩定则的情况都会导致高阶干涉，因此可以在实验中进行测试。在这里，我们报告这样的测试与量子光源的基础上的色心在六方氮化硼（hBN）耦合到一个微腔。我们的室温光子源具有窄线宽、高效率、高纯度和按需单光子产生的特点。与传统的基于激光的光源相比，利用单光子源，我们可以通过完全抑制探测器的非线性来增加我们的三路干涉仪的干涉灵敏度。从而得到了$3.96(523)\times 10^{-4}$的三阶干涉项的严格界。我们还测量了在室温下从hBN发射的单光子的干涉可见度为98.58%，这为使用hBN平台作为量子密钥分发中的相位编码方案的光源提供了一条有前途的路线。
英文摘要：
Quantum theory is the foundation of modern physics. Some of its basic principles, such as Born's rule, however, are based on postulates which require experimental testing. Any deviation from Born's rule would result in higher-order interference and can thus be tested in an experiment. Here, we report on such a test with a quantum light source based on a color center in hexagonal boron nitride (hBN) coupled to a microcavity. Our room temperature photon source features a narrow linewidth, high efficiency, high purity, and on-demand single-photon generation. With the single-photon source we can increase the interferometric sensitivity of our three-path interferometer compared to conventional laser-based light sources by fully suppressing the detector nonlinearity. We thereby obtain a tight bound on the third-order interference term of $3.96(523)\times 10^{-4}$. We also measure an interference visibility of 98.58% for our single-photons emitted from hBN at room temperature, which provides a promising route for using the hBN platform as light source for phase-encoding schemes in quantum key distribution.
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