Bandwidth-Tunable Quantum Light Source at 1.5 $\mu$m

Title: Bandwidth-Tunable Quantum Light Source at 1.5 μm

Abstract: Quantum light sources constitute a crucial physical resource for the construction of quantum networks. Despite remarkable recent progress, there remains a lack of systematic investigation into the bandwidth tunability of quantum light sources under fixed waveguide parameters. In this work, we demonstrate a broadband quantum light source in the 1.5 μm band with tunable bandwidth by changing the temperature of a piece of periodically poled lithium niobate waveguide. In our demonstration, the bandwidth of the quantum light source is tuned from 78.3 nm to 96.2 nm with a temperature change of 1 °C. Under different bandwidths, the generation rates of correlated photon pairs are greater than 6.3 MHz with coincidence-to-accidental ratios consistently being no less than 608. The energy-time entanglement properties are measured by using the Franson interference with two-photon interference visibilities larger than 99.06%. Our results provide an effective method for developing the quantum light sources with tunable bandwidth which has great potential for building the large-scale quantum networks.

arXiv:2609.20251 [quant-ph]

(or arXiv:2609.20251v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.20251 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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