Going quantum with metamaterials Metasurfaces should allow wafer-thin surfaces to replace bulk optical components. Two reports now demonstrate that metasurfaces can be extended into the quantum optical regime. Wang et al. determined the quantum state of multiple photons by simply passing them through a dielectric metasurface, scattering them into single-photon detectors. Stav et al. used a dielectric metasurface to generate entanglement between spin and orbital angular momentum of single photons. The results should aid the development of integrated quantum optic circuits operating on a nanophotonic platform. Science, this issue p. 1104, p. 1101 Metasurfaces are demonstrated to operate in the quantum optical regime. Metamaterials constructed from deep subwavelength building blocks have been used to demonstrate phenomena ranging from negative refractive index and ε-near-zero to cloaking, emulations of general relativity, and superresolution imaging. More recently, metamaterials have been suggested as a new platform for quantum optics. We present the use of a dielectric metasurface to generate entanglement between the spin and orbital angular momentum of photons. We demonstrate the generation of the four Bell states on a single photon by using the geometric phase that arises from the photonic spin-orbit interaction and subsequently show nonlocal correlations between two photons that interacted with the metasurface. Our results show that metamaterials are suitable for the generation and manipulation of entangled photon states, introducing the area of quantum optics metamaterials.

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使用超材料对光子的自旋和轨道角动量进行量子纠缠

使用超材料实现量子化 超表面应该允许超薄表面取代体光学元件。现在有两份报告表明超表面可以扩展到量子光学领域。王等人。通过简单地将多个光子穿过介电超表面，将它们散射到单光子探测器中来确定多个光子的量子态。斯塔夫等人。使用介电超表面在单光子的自旋和轨道角动量之间产生纠缠。结果应该有助于开发在纳米光子平台上运行的集成量子光学电路。科学，这个问题 p。1104 页。1101 超表面被证明在量子光学范围内工作。由深亚波长构建块构建的超材料已被用于展示从负折射率和 ε 接近零到隐形、广义相对论模拟和超分辨率成像的现象。最近，超材料被建议作为量子光学的新平台。我们展示了使用介电超表面来产生光子的自旋和轨道角动量之间的纠缠。我们通过使用由光子自旋轨道相互作用产生的几何相位来证明在单个光子上产生四个贝尔态，并随后显示与超表面相互作用的两个光子之间的非局部相关性。我们的结果表明，超材料适用于纠缠光子态的产生和操纵，