Upper bound for the quantum coupling between free electrons and photons
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866913572961910784 |
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| author | Zhao, Zhexin |
| author_facet | Zhao, Zhexin |
| contents | The quantum interaction between free electrons and photons is fundamental to free-electron based light sources and free-electron quantum optics applications. A large coupling between free electrons and photons is generally desired. In this manuscript, I obtain the upper bound for the quantum coupling between free electrons and photons. The upper bound has a straightforward expression and can be applied to a broad range of optical materials, especially widely used low-loss photonic materials. The upper bound depends on the optical medium, the free-electron velocity, and the separation between the free electron and the optical medium. With simple structures, the numerically calculated coupling coefficient can reach ~99% of the upper bound. This study provides simple and practical guidance to reach the strong coupling between free electrons and photons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_01221 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Upper bound for the quantum coupling between free electrons and photons Zhao, Zhexin Quantum Physics Optics The quantum interaction between free electrons and photons is fundamental to free-electron based light sources and free-electron quantum optics applications. A large coupling between free electrons and photons is generally desired. In this manuscript, I obtain the upper bound for the quantum coupling between free electrons and photons. The upper bound has a straightforward expression and can be applied to a broad range of optical materials, especially widely used low-loss photonic materials. The upper bound depends on the optical medium, the free-electron velocity, and the separation between the free electron and the optical medium. With simple structures, the numerically calculated coupling coefficient can reach ~99% of the upper bound. This study provides simple and practical guidance to reach the strong coupling between free electrons and photons. |
| title | Upper bound for the quantum coupling between free electrons and photons |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2404.01221 |