AI 中文总结
本文通过温度调谐周期性极化铌酸锂波导，实现了1.5 μm波段带宽可调的量子光源，带宽调谐范围78.3-96.2 nm，产生速率高且纠缠质量优，为大规模量子网络提供有效方法。
AI 中文摘要
量子光源是构建量子网络的关键物理资源。尽管近年来取得了显著进展，但在固定波导参数下对量子光源带宽可调谐性的系统研究仍然缺乏。在本工作中，我们通过改变一段周期性极化铌酸锂波导的温度，演示了一种位于1.5 $\mu$m 波段的宽带量子光源，其带宽可调。在我们的演示中，量子光源的带宽在温度变化1 $^\circ$C 的条件下从78.3 nm 调谐至96.2 nm。在不同带宽下，相关光子对的产生速率均大于6.3 MHz，且符合-偶然符合比始终不低于608。利用 Franson 干涉测量了能量-时间纠缠特性，双光子干涉可见度大于99.06%。我们的结果为开发带宽可调谐的量子光源提供了一种有效方法，该方法在构建大规模量子网络方面具有巨大潜力。
英文摘要
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 $μ$m 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 $^\circ$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.
