Quantum information, communication, and sensing rely on the generation and control of quantum correlations in complementary degrees of freedom. Free electrons coupled to photonics promise novel hybrid quantum technologies, although single-particle correlations and entanglement have yet to be shown. In this work, we demonstrate the preparation of electron-photon pair states using the phase-matched interaction of free electrons with the evanescent vacuum field of a photonic chip–based optical microresonator. Spontaneous inelastic scattering produces intracavity photons coincident with energy-shifted electrons, which we employ for noise-suppressed optical mode imaging. This parametric pair-state preparation will underpin the future development of free-electron quantum optics, providing a route to quantum-enhanced imaging, electron-photon entanglement, and heralded single-electron and Fock-state photon sources.

中文翻译：

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腔介导的电子-光子对

量子信息、通信和传感依赖于互补自由度的量子相关性的产生和控制。与光子学耦合的自由电子有望实现新型混合量子技术，尽管尚未显示单粒子相关性和纠缠。在这项工作中，我们展示了使用自由电子与基于光子芯片的光学微谐振器的倏逝真空场的相位匹配相互作用来制备电子 - 光子对状态。自发非弹性散射产生与能量转移电子一致的腔内光子，我们将其用于噪声抑制光学模式成像。这种参数对态的制备将支撑自由电子量子光学的未来发展，为量子增强成像、电子-光子纠缠、