Entangled X-ray Photon Pair Generation by Free Electron Lasers

• URL: http://arxiv.org/abs/2208.01335v2
• Date: Fri, 4 Nov 2022 03:35:37 GMT
• Title: Entangled X-ray Photon Pair Generation by Free Electron Lasers
• Authors: Linfeng Zhang (1), Zunqi Li (1), Dongyu Liu (1), Ming Zhang (1), Chengyin Wu (1,3,4), Haitan Xu (2) and Zheng Li (1,3,4) ((1) State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing, China, (2) Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China, (3) Peking University Yangtze Delta Institute of Optoelectronics, Nantong, China, (4) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, China)
• Abstract summary: In X-ray optics, entangled photon pairs can be generated by X-ray parametric down conversion (XPDC) Free electron laser (FEL) has successfully lased at X-ray recently.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Einstein, Podolsky and Rosen's prediction on incompleteness of quantum mechanics was overturned by experimental tests on Bell's inequality that confirmed the existence of quantum entanglement. In X-ray optics, entangled photon pairs can be generated by X-ray parametric down conversion (XPDC), which has certain wavelength window. Meanwhile, free electron laser (FEL) has successfully lased at X-ray frequencies recently. However, FEL is usually seen as a classical light source, and its quantum effects are considered minor corrections to the classical theory. Here we investigate entangled X-ray photon pair emissions in FEL. We establish a theory for coherently amplified entangled photon pair emission from microbunched electron pulses in the undulator. We also propose an experimental scheme for the observation of the entangled photon pairs via energy and spatial correlation measurements. Such an entangled X-ray photon pair source is of great importance in quantum optics and other X-ray applications.

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