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Quantum light sources are one of the key devices for quantum information processing, and they are the important foundation for applications such as quantum computing, quantum communication, and quantum simulation, etc. Improving the capacity of quantum information coding with the quantum light sources is a major challenge in the development of quantum information technology. Photons with a helical phase front can carry a discrete, unlimited but quantized amount of orbital angular momentum (OAM). The infinite number of states with different OAMs can greatly increase the capacity of optical communication and information processing in quantum regimes. To date, the generation of photons carrying OAM mainly with bulk crystals, which limits both the efficiency and the scalability of the source. With the advancement of quantum photonic technology, many significant quantum photonic devices can now be realized on integrated chips. However, creating high-dimensional OAM quantum states at the micro-nano scale is still a challenge. And the progress in harnessing high dimensional OAM mode with integrated quantum photonic technologies remains in its infancy. Here, the authors review the recent progress and discuss the integrated quantum light sources with OAM. The authors cover advances in using OAM for both single photons and entangled photons and highlight the exciting work in pushing the boundaries in high dimensional quantum states. This may pave the research and practical applications of high-dimensional quantum light sources.
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Keywords:
- Orbital angular momentum /
- Quantum light source /
- Integration /
- High-dimensional quantum state
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