Hong-Ou-Mandel Interference Between a Warm Cs Atomic Ensemble and a Quantum Dot for Hybrid Quantum Networks
ORAL
Abstract
Atomic vapor cells are promising platforms for hybrid quantum networks due to their intrinsic spectral uniformity and compatibility with atom-based quantum memories. Establishing quantum interference between heterogeneous quantum nodes is essential for quantum teleportation.
In this work, we demonstrate Hong–Ou–Mandel (HOM) interference between a cesium-based heralded single photon source and a quantum-dot-based single photon emitter. Heralded single photons are generated from a warm 133Cs atomic ensemble at 917 nm via spontaneous four-wave mixing on the 6S1/2-6P3/2-6D5/2 transition. We systematically characterize and engineer the spectral properties of the atomic single photon source using a scanning Fabry-Perot interferometer. By controlling the vapor cell temperature, we adjust the spectral bandwidth of the Cs photons, while the center frequency of the quantum dot emission is tuned via sample stage temperature regulation. As a result, a high spectral overlap between the two independent sources is achieved. Under these conditions, we observe HOM interference with a visibility of 0.65 after deconvolution of detector timing jitter.
Our results demonstrate that warm atomic ensembles can serve as spectrally compatible and robust quantum light sources for interfacing solid-state emitters, providing a practical pathway toward hybrid teleportation and scalable quantum networks.
In this work, we demonstrate Hong–Ou–Mandel (HOM) interference between a cesium-based heralded single photon source and a quantum-dot-based single photon emitter. Heralded single photons are generated from a warm 133Cs atomic ensemble at 917 nm via spontaneous four-wave mixing on the 6S1/2-6P3/2-6D5/2 transition. We systematically characterize and engineer the spectral properties of the atomic single photon source using a scanning Fabry-Perot interferometer. By controlling the vapor cell temperature, we adjust the spectral bandwidth of the Cs photons, while the center frequency of the quantum dot emission is tuned via sample stage temperature regulation. As a result, a high spectral overlap between the two independent sources is achieved. Under these conditions, we observe HOM interference with a visibility of 0.65 after deconvolution of detector timing jitter.
Our results demonstrate that warm atomic ensembles can serve as spectrally compatible and robust quantum light sources for interfacing solid-state emitters, providing a practical pathway toward hybrid teleportation and scalable quantum networks.
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Publication: (preprint) Kim, K.-Y., Kim, H., Park, D. H., Bea, J., Ju, G., Park, S. I., Song, J. D., Kim, J.-H., & Moon, H. S. Quantum interference between autonomous dissimilar quantum light sources for hybrid quantum networks. arXiv, 2510.05607 (2025). https://doi.org/10.48550/arXiv.2510.05607
Presenters
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HeeWoo Kim
- Pusan National University