Davidson-Marquis Flavie, Gargiulo Julian, Gómez-López Esteban, Jang Bumjoon, Kroh Tim, Müller Chris, Ziegler Mario, Maier Stefan A, Kübler Harald, Schmidt Markus A, Benson Oliver
Department of Physics and IRIS Adlershof, Humboldt-Universität zu Berlin, 12489, Berlin, Germany.
Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-Universität München, 80539, Munich, Germany.
Light Sci Appl. 2021 May 31;10(1):114. doi: 10.1038/s41377-021-00556-z.
Controlling coherent interaction between optical fields and quantum systems in scalable, integrated platforms is essential for quantum technologies. Miniaturised, warm alkali-vapour cells integrated with on-chip photonic devices represent an attractive system, in particular for delay or storage of a single-photon quantum state. Hollow-core fibres or planar waveguides are widely used to confine light over long distances enhancing light-matter interaction in atomic-vapour cells. However, they suffer from inefficient filling times, enhanced dephasing for atoms near the surfaces, and limited light-matter overlap. We report here on the observation of modified electromagnetically induced transparency for a non-diffractive beam of light in an on-chip, laterally-accessible hollow-core light cage. Atomic layer deposition of an alumina nanofilm onto the light-cage structure was utilised to precisely tune the high-transmission spectral region of the light-cage mode to the operation wavelength of the atomic transition, while additionally protecting the polymer against the corrosive alkali vapour. The experiments show strong, coherent light-matter coupling over lengths substantially exceeding the Rayleigh range. Additionally, the stable non-degrading performance and extreme versatility of the light cage provide an excellent basis for a manifold of quantum-storage and quantum-nonlinear applications, highlighting it as a compelling candidate for all-on-chip, integrable, low-cost, vapour-based photon delay.
在可扩展的集成平台中控制光场与量子系统之间的相干相互作用对于量子技术至关重要。与片上光子器件集成的小型化、温热碱金属蒸汽室代表了一种有吸引力的系统，特别是对于单光子量子态的延迟或存储。空心光纤或平面波导被广泛用于长距离限制光，增强原子蒸汽室中的光与物质相互作用。然而，它们存在填充时间效率低、表面附近原子的退相干增强以及光与物质重叠有限等问题。我们在此报告了在片上、横向可访问的空心光笼中对非衍射光束观察到的修正电磁诱导透明现象。利用在光笼结构上原子层沉积氧化铝纳米膜，将光笼模式的高透射光谱区域精确调谐到原子跃迁的工作波长，同时还能保护聚合物免受腐蚀性碱蒸汽的影响。实验表明，在长度大大超过瑞利范围的情况下，存在强相干光与物质耦合。此外，光笼稳定的非退化性能和极高的通用性为多种量子存储和量子非线性应用提供了良好基础，突出了它作为全片上、可集成、低成本、基于蒸汽的光子延迟的有力候选者的地位。
