Is it possible that a measurement of a spin component of a spin-1/2 particle yields the value 100? In 1988 Aharonov, Albert and Vaidman argued that upon pre- and postselection of particular spin states, weakening the coupling of a standard measurement procedure ensures this paradoxical result. This theoretical prediction, called weak value, was realized in numerous experiments, but its meaning remains very controversial, since its "anomalous" nature, i.e. the possibility to exceed the eigenvalues range, as well as its "quantumness" are debated. We address these questions by presenting the first experiment measuring anomalous weak values with just a single click, without any statistics. The measurement uncertainty is significantly smaller than the gap between the measured weak value and the nearest eigenvalue. Beyond clarifying the meaning of weak values, this result represents a breakthrough in understanding quantum measurement foundations, paving the way to further applications of weak values to quantum photonics.
Photon Anomalous Blockade in Waveguide Cavity QED with Atomic Mirrors
School of integrated circuits, Tsinghua University（清华大学集成电路学院）；Beijing Automation Control Equipment Institute（北京自动化控制设备研究所）；Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）；CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences（中国科学院大学拓扑量子计算卓越创新中心）；Frontier Science Center for Quantum Information（量子信息前沿科学中心）
Loss-induced anomalous generalized bunching in multiphoton interference
Graduate School of Engineering Science, The University of Osaka（大阪大学工程科学研究科）；Center for Quantum Information and Quantum Biology, The University of Osaka（大阪大学量子信息与量子生物学中心）
Anomalous weak values and contextuality: robustness, tightness, and imaginary parts
弱值是通过涉及弱测量和后选择的量子实验获得的量。它已被证明，“异常”弱值（那些躺在相应的运营商的本征值范围之外）无视经典的解释，在这个意义上，需要上下文[M。F. Pusey，Phys. Rev. Lett. 113，200401，arXiv：1409.1535]。在这里，我们详细阐述和扩展的结果在几个方向。首先，原始定理需要某些完美的相关性，而这些相关性在任何实际实验中都无法实现。因此，我们提供了新的定理，允许从异常的弱值的上下文的噪声鲁棒性的实验验证，并与最近的实验比较。第二，原来的定理连接异常的上下文只有在存在一整套额外的操作约束。在这里，我们澄清了围绕异常弱值的争论，表明这些条件是严格的-如果其中任何一个被丢弃，异常可以被经典地再现。第三，在原来的结果要求弱值的实部是反常的情况下，我们也给出了虚部非零的弱值的一个版本。最后，我们证明了类似的结果，如果弱测量是通过量子比特指针，而不是传统的连续系统。总之，我们提供了不等式证明非经典使用实验现实测量任何异常的弱值，并澄清量子实验的成分必须在任何经典模型，可以重现异常的缺失。
Atom-Photon Bound States in Fractal Photonic Lattices: Localization Length and Anomalous Diffusion
Max Planck Institute for the Science of Light（马克斯·普朗克光科学研究所）；Friedrich-Alexander-Universität Erlangen-Nürnberg（埃尔朗根-纽伦堡弗里德里希·阿列克桑德大学）；Università degli Studi di Palermo（巴勒莫大学）
Large quantum dot energy level shifts in anomalous photon-assisted tunneling
University of Wisconsin-Madison（威斯康星大学麦迪逊分校）；Delft University of Technology（代尔夫特理工大学）；Netherlands Organisation for Applied Scientific Research（荷兰应用科学研究组织）
