Hwang Hyeon, Noh Woojin, Nurrahman Mohamad Reza, Kim Guhwan, Moon Kiwon, Ju Jung Jin, Lee Hansuek, Seo Min-Kyo
Opt Lett. 2024 Oct 1;49(19):5379-5382. doi: 10.1364/OL.533039.
Spontaneous parametric downconversion (SPDC) has been crucial for producing non-classical light, such as correlated photon pairs and squeezed states, essential for optical quantum technologies. Recently, thin-film lithium niobate (TFLN)-based devices have enabled high-performance SPDC in on-chip integrated photonic platforms. Here, we developed an X-cut periodically poled lithium niobate (PPLN) racetrack micro-resonator with a compact footprint and demonstrated bright SPDC photon pair generation characterized by distinct resonances and high extraction efficiency. We separately assessed the internal and loaded photon pair generation rates, measuring them at 4.525 MHz/µW and 62.73 kHz/µW, respectively. Our platform is integrated with maturing electro-/thermo-optic TFLN circuit elements and has meaningful potential for advancing active quantum photonic applications.
自发参量下转换（SPDC）对于产生非经典光至关重要，例如关联光子对和压缩态，这对于光量子技术必不可少。最近，基于薄膜铌酸锂（TFLN）的器件已在片上集成光子平台中实现了高性能的SPDC。在此，我们开发了一种具有紧凑尺寸的X切周期性极化铌酸锂（PPLN）跑道微谐振器，并展示了以明显共振和高提取效率为特征的明亮SPDC光子对产生。我们分别评估了内部和负载光子对产生率，测量结果分别为4.525 MHz/µW和62.73 kHz/µW。我们的平台与成熟的电光/热光TFLN电路元件集成在一起，在推进有源量子光子应用方面具有重要潜力。
