High-efficiency telecom conversion of heralded atomic biphoton wavepackets

Abstract:We demonstrate high-efficiency telecom frequency conversion of heralded atomic biphoton wavepackets using a diamond-type atomic ensemble. By placing a 2.5 MHz heralded-photon spectrum within the high-efficiency region of the converter response, we achieve a conversion efficiency of 79.4(2.6)% while maintaining strong time-resolved correlations and well-defined temporal wavepackets. For a broader 17.4 MHz input bandwidth, the conversion efficiency is reduced to about 55%, whereas the temporal waveform remains largely preserved. This behavior reflects the nearly flat central response of the converter, which mainly causes spectral-edge loss rather than temporal-mode distortion. These results identify spectral matching as an effective route to efficient and low-distortion telecom conversion of narrowband quantum light from atomic systems.

Quantum Physics (quant-ph); Optics (physics.optics)

arXiv:2603.09824 [quant-ph]

(or arXiv:2603.09824v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2603.09824 Focus to learn more arXiv-issued DOI via DataCite

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